From 91739f178c5c3b5711898e03a4e3b0ea425eb296 Mon Sep 17 00:00:00 2001 From: Guoliang WANG Date: Tue, 29 Dec 2020 15:51:11 +0800 Subject: [PATCH 01/77] book: typo fixes (#164) Co-authored-by: guoliang wang --- book/en-us/03-runtime.md | 4 ++-- book/zh-cn/03-runtime.md | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index ea235daf..a3efdf63 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -87,8 +87,8 @@ capture lists can be: - \[\] empty capture list - \[name1, name2, ...\] captures a series of variables -- \[&\] reference capture, let the compiler derive the capture list by itself -- \[=\] value capture, let the compiler execute the list of derivation applications +- \[&\] reference capture, let the compiler deduce the reference list by itself +- \[=\] value capture, let the compiler deduce the value list by itself #### 4. Expression capture diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index e4d02d7a..161ed90e 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -76,8 +76,8 @@ void lambda_reference_capture() { - \[\] 空捕获列表 - \[name1, name2, ...\] 捕获一系列变量 -- \[&\] 引用捕获, 让编译器自行推导捕获列表 -- \[=\] 值捕获, 让编译器执行推导引用列表 +- \[&\] 引用捕获, 让编译器自行推导引用列表 +- \[=\] 值捕获, 让编译器自行推导值捕获列表 **4. 表达式捕获** From 054119f69c74d4f2da150658452b1b4ad690dc67 Mon Sep 17 00:00:00 2001 From: Guoliang WANG Date: Tue, 29 Dec 2020 15:52:14 +0800 Subject: [PATCH 02/77] book: fmt (#163) Co-authored-by: guoliang wang --- book/zh-cn/03-runtime.md | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 161ed90e..2c880375 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -27,12 +27,12 @@ Lambda 表达式的基本语法如下： 上面的语法规则除了 `[捕获列表]` 内的东西外，其他部分都很好理解，只是一般函数的函数名被略去， 返回值使用了一个 `->` 的形式进行（我们在上一节前面的尾返回类型已经提到过这种写法了）。 -所谓捕获列表，其实可以理解为参数的一种类型，lambda 表达式内部函数体在默认情况下是不能够使用函数体外部的变量的， +所谓捕获列表，其实可以理解为参数的一种类型，Lambda 表达式内部函数体在默认情况下是不能够使用函数体外部的变量的， 这时候捕获列表可以起到传递外部数据的作用。根据传递的行为，捕获列表也分为以下几种： #### 1. 值捕获 -与参数传值类似，值捕获的前提是变量可以拷贝，不同之处则在于，被捕获的变量在 lambda 表达式被创建时拷贝， +与参数传值类似，值捕获的前提是变量可以拷贝，不同之处则在于，被捕获的变量在 Lambda 表达式被创建时拷贝， 而非调用时才拷贝： ```cpp @@ -72,7 +72,7 @@ void lambda_reference_capture() { 手动书写捕获列表有时候是非常复杂的，这种机械性的工作可以交给编译器来处理，这时候可以在捕获列表中写一个 `&` 或 `=` 向编译器声明采用引用捕获或者值捕获. -总结一下，捕获提供了lambda 表达式对外部值进行使用的功能，捕获列表的最常用的四种形式可以是： +总结一下，捕获提供了 Lambda 表达式对外部值进行使用的功能，捕获列表的最常用的四种形式可以是： - \[\] 空捕获列表 - \[name1, name2, ...\] 捕获一系列变量 @@ -157,7 +157,7 @@ int main() { C++11 `std::function` 是一种通用、多态的函数封装， 它的实例可以对任何可以调用的目标实体进行存储、复制和调用操作， -它也是对 C++中现有的可调用实体的一种类型安全的包裹（相对来说，函数指针的调用不是类型安全的）， +它也是对 C++ 中现有的可调用实体的一种类型安全的包裹（相对来说，函数指针的调用不是类型安全的）， 换句话说，就是函数的容器。当我们有了函数的容器之后便能够更加方便的将函数、函数指针作为对象进行处理。 例如： @@ -241,7 +241,7 @@ int main() { } ``` -**将亡值(xvalue, expiring value)**，是 C++11 为了引入右值引用而提出的概念（因此在传统 C++中， +**将亡值(xvalue, expiring value)**，是 C++11 为了引入右值引用而提出的概念（因此在传统 C++ 中， 纯右值和右值是同一个概念），也就是即将被销毁、却能够被移动的值。 将亡值可能稍有些难以理解，我们来看这样的代码： @@ -256,7 +256,7 @@ std::vector v = foo(); ``` 在这样的代码中，就传统的理解而言，函数 `foo` 的返回值 `temp` 在内部创建然后被赋值给 `v`， -然而 `v` 获得这个对象时，会将整个 temp 拷贝一份，然后把 `temp` 销毁，如果这个 `temp` 非常大， +然而 `v` 获得这个对象时，会将整个 `temp` 拷贝一份，然后把 `temp` 销毁，如果这个 `temp` 非常大， 这将造成大量额外的开销（这也就是传统 C++ 一直被诟病的问题）。在最后一行中，`v` 是左值、 `foo()` 返回的值就是右值（也是纯右值）。但是，`v` 可以被别的变量捕获到， 而 `foo()` 产生的那个返回值作为一个临时值，一旦被 `v` 复制后，将立即被销毁，无法获取、也不能修改。 From 7eceaf1bee6790e64a6965b93b312f25656e41ab Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Thu, 31 Dec 2020 09:26:05 +0100 Subject: [PATCH 03/77] all: remove chat group (#165) --- README-zh-cn.md | 2 +- README.md | 3 +-- assets/community.md | 11 ----------- website/Makefile | 2 -- .../themes/moderncpp/layout/partials/main_menu.ejs | 1 - .../themes/moderncpp/layout/partials/main_menu_en.ejs | 1 - 6 files changed, 2 insertions(+), 18 deletions(-) delete mode 100644 assets/community.md diff --git a/README-zh-cn.md b/README-zh-cn.md index 3e98207a..1b0aef83 100644 --- a/README-zh-cn.md +++ b/README-zh-cn.md @@ -2,7 +2,7 @@ # 现代 C++ 教程：高速上手 C++11/14/17/20 -![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) [![](https://img.shields.io/badge/chat-community-667ed5.svg?style=flat-square)](./assets/community.md) +![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) ## 本书目的 diff --git a/README.md b/README.md index 8e94da7e..6ef8ae93 100644 --- a/README.md +++ b/README.md @@ -2,8 +2,7 @@ # Modern C++ Tutorial: C++11/14/17/20 On the Fly -![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) [![](https://img.shields.io/badge/chat-community-667ed5.svg?style=flat-square)](./assets/community.md) - +![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) ## Purpose The book claims to be "On the Fly". Its intent is to provide a comprehensive introduction to the relevant features regarding modern C++ (before 2020s). diff --git a/assets/community.md b/assets/community.md deleted file mode 100644 index 657980cf..00000000 --- a/assets/community.md +++ /dev/null @@ -1,11 +0,0 @@ ---- -title: 社区 -type: about -order: 2 ---- - -## Community - -The book offers a telegram chat group, feel free to join if you are interested: - -[![](https://img.shields.io/badge/chat-telegram-blue.svg?style=popout-square&logo=telegram)](https://t.me/joinchat/FEeulBM5OVYzuDI4phQ9Mg) diff --git a/website/Makefile b/website/Makefile index a3591267..d0d625fe 100755 --- a/website/Makefile +++ b/website/Makefile @@ -8,7 +8,6 @@ all: clean cp ../assets/alipay.jpg ./src/modern-cpp/assets/alipay.jpg cp ../assets/wechat.jpg ./src/modern-cpp/assets/wechat.jpg cp ../assets/donate.md ./src/modern-cpp/about/ - cp ../assets/community.md ./src/modern-cpp/about/ cp -r ../assets/figures ./src/modern-cpp/assets/figures cp -r ../exercises ./src/modern-cpp/ cp -r ../code ./src/modern-cpp/ @@ -25,7 +24,6 @@ clean: ./src/modern-cpp/assets/alipay.jpg \ ./src/modern-cpp/assets/wechat.jpg \ ./src/modern-cpp/about/donate.md \ - ./src/modern-cpp/about/community.md \ ./src/modern-cpp/code \ ./src/modern-cpp/exercises \ public db.json src/modern-cpp/zh-cn src/modern-cpp/en-us diff --git a/website/themes/moderncpp/layout/partials/main_menu.ejs b/website/themes/moderncpp/layout/partials/main_menu.ejs index a2cd2124..9a2f3ed8 100755 --- a/website/themes/moderncpp/layout/partials/main_menu.ejs +++ b/website/themes/moderncpp/layout/partials/main_menu.ejs @@ -16,7 +16,6 @@
    • diff --git a/website/themes/moderncpp/layout/partials/main_menu_en.ejs b/website/themes/moderncpp/layout/partials/main_menu_en.ejs index dcd0db1d..3fc1a937 100644 --- a/website/themes/moderncpp/layout/partials/main_menu_en.ejs +++ b/website/themes/moderncpp/layout/partials/main_menu_en.ejs @@ -16,7 +16,6 @@
      • From a5445b7c55e1c0ee0daf717714aabbca0a0a4bb8 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Thu, 31 Dec 2020 09:38:32 +0100 Subject: [PATCH 04/77] book: typo fixes Fixes #159 --- book/en-us/07-thread.md | 2 +- book/zh-cn/07-thread.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 3f3bbfb5..9c907495 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -465,7 +465,7 @@ In order to achieve the ultimate performance and achieve consistency of various 3. Release/Acquire model: Under this model, we can further tighten the order of atomic operations between different threads, specifying the timing between releasing `std::memory_order_release` and getting `std::memory_order_acquire`. **All** write operations before the release operation are visible to any other thread, ie, happens-before. - As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a backward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a forward barrier. For the `std::memory_order_acq_rel` option, it combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation. + As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a forward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a backward barrier. For the `std::memory_order_acq_rel` option, it combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation. Let's check an example: diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index e5250680..c41bcc26 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -474,7 +474,7 @@ int main() { 3. 释放/获取模型：在此模型下，我们可以进一步加紧对不同线程间原子操作的顺序的限制，在释放 `std::memory_order_release` 和获取 `std::memory_order_acquire` 之间规定时序，即发生在释放操作之前的**所有**写操作，对其他线程的任何获取操作都是可见的，亦即发生顺序（happens-before）。 - 可以看到，`std::memory_order_release` 确保了它之后的写行为不会发生在释放操作之前，是一个向后的屏障，而 `std::memory_order_acquire` 确保了它之前的写行为，不会发生在该获取操作之后，是一个向前的屏障。对于选项 `std::memory_order_acq_rel` 而言，则结合了这两者的特点，唯一确定了一个内存屏障，使得当前线程对内存的读写不会被重排到此操作的前后。 + 可以看到，`std::memory_order_release` 确保了它之后的写行为不会发生在释放操作之前，是一个向前的屏障，而 `std::memory_order_acquire` 确保了它之前的写行为，不会发生在该获取操作之后，是一个向后的屏障。对于选项 `std::memory_order_acq_rel` 而言，则结合了这两者的特点，唯一确定了一个内存屏障，使得当前线程对内存的读写不会被重排到此操作的前后。 我们来看一个例子： From 6b73213e785b6ce35be3e1484c57922230477d83 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 13 Jan 2021 13:34:59 +0100 Subject: [PATCH 05/77] assets: remove qq group 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z=&_Y{AqAVo-i?0S&&^&sqw=-pD?kz>7rwH>v$^8bovA>{?IYJ+>K-`Spvj8JIRjDB z{Pf2tQ|_`(@PwT}+exLQ7&%PW?;CV)>xh`y7`vm#?)=8wT9smxDV6}uKsR3MUY2tx zxj7yz&RpKY=MKY^;7|#R({Po#U>kEN9|0QF4d3faCBQH>H3_8)Rh{a-H8Z*mYJBj9 z7_c+_{^1ed6=bC21Y(N0=N3>`tM8DL{<%#(0HOsE{mgQrrpn%xej=J0UnB)_k%{Vs zByR=>xM?RD_@_v*)ba0z>0Dy<30U6gMd|19O1?LSaw<|GKSD7&B6xFy<7?!b>Xh0! z%RGhj0N5=DruIv;=|?UR8a%svvC%@-n?5p&L9DcppUuC{N{tu@GTwT4$n}*%7{8$X zwoxKj!3ZFpYin;ZMu?nIfPmOpi)UD zP$8^&@ibL(y@YHdFf7Qk!+hMh%}Y}oPKk1M+}O}`v#S)&*?BaUY1k#3$3<ucPe^?TTUh~NF62F)i!?h!u zL_|g#0+hnRZm|a>&?Fg0QTDP>z3l!${1OsRyEE7{o1?*Mfx!2Jh#5o?1Ka6mF3UDw zJb*r=-fzWe`KXThmjKUXX8~wUh}coi^R|GA*EttBHb|{yHWg}dGkB90G35)89ZK|% z<&%P1nN$(iAl2K@zv48a^K_lcL6UZaaJJx+2KUmKQbeGi57H2t*pfz2gxzReH5km^ zBdD|&8kQ$#k`pvO#1=|vLb-@@j@|=h{KBr|=gb<$)p+vUoE3|%&U2O9rjBpk$tH5UK zU4L@SC)*5>*U=KxL=CZxquJ`H#y%A9mw`#SqiO!{_+7%ilP28ZZRqj$s_9FU(Zezn z?2<=jwStgV9d#F!0#&T$#D!jEnsGyot@g#8%H)Aw9F7Y^y|gcv-L4Kcull}N1FeX}^kTh`-dy zJMX#UZ|`#lDwJCGt$==!Bhl>#ZBW04)vC_xI8x5vNbfJ{-0z7Ndf^8yVOd52(E|V>6>U0|9$1_<-I!SL=G?!YI>p^e+V>dWTsDp({5V ze7A}C^@8{oA1HD9u1YdciwBz0g3sI^F=h)4VvOvD4u6SFX35G)e?Z2L5Wg{L0g70| zWB#>WP1}MA+K&#A4 zja`iG2&Bi&T3!~SdwCf9XvYh6Skx*?PvOM(9gsIm{VuQBr^XH=vFd9&y7fK86#27G zwnzL`PZv0UMpUbMI6Mt-YVR)|@cnxtHQ)U(#nlrMgj?faW@WRVj$is~w6$6-J zZ0NRiWh Date: Sun, 24 Jan 2021 18:42:14 +1100 Subject: [PATCH 06/77] pdf: fix rendering issue due to line break (#170) Fixes #149 --- book/zh-cn/01-intro.md | 1 + 1 file changed, 1 insertion(+) diff --git a/book/zh-cn/01-intro.md b/book/zh-cn/01-intro.md index 94a9a1b8..80e324c1 100644 --- a/book/zh-cn/01-intro.md +++ b/book/zh-cn/01-intro.md @@ -25,6 +25,7 @@ InstalledDir: /Library/Developer/CommandLineTools/usr/bin > **注意**：弃用并非彻底不能用，只是用于暗示程序员这些特性将从未来的标准中消失，应该尽量避免使用。但是，已弃用的特性依然是标准库的一部分，并且出于兼容性的考虑，大部分特性其实会『永久』保留。 - **不再允许字符串字面值常量赋值给一个 `char *`。如果需要用字符串字面值常量赋值和初始化一个 `char *`，应该使用 `const char *` 或者 `auto`。** + ```cpp char *str = "hello world!"; // 将出现弃用警告 ``` From 25aa34742824597330ab6ba066313f5833b976a3 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sat, 6 Feb 2021 23:35:01 +0100 Subject: [PATCH 07/77] website: add urlstat --- website/themes/moderncpp/layout/layout.ejs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/website/themes/moderncpp/layout/layout.ejs b/website/themes/moderncpp/layout/layout.ejs index 44f18961..442f1810 100755 --- a/website/themes/moderncpp/layout/layout.ejs +++ b/website/themes/moderncpp/layout/layout.ejs @@ -29,7 +29,7 @@ - + <% if (page.type == 'book-en-us') { %> From aa4d1eead5ac49af6669ea6526b0b2232316d42c Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Thu, 11 Feb 2021 14:12:32 +0100 Subject: [PATCH 08/77] github: add sponsor button --- .github/FUNDING.yml | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 .github/FUNDING.yml diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml new file mode 100644 index 00000000..2957eb0e --- /dev/null +++ b/.github/FUNDING.yml @@ -0,0 +1,12 @@ +# These are supported funding model platforms + +github: [changkun] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2] +patreon: # Replace with a single Patreon username +open_collective: # Replace with a single Open Collective username +ko_fi: # Replace with a single Ko-fi username +tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel +community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry +liberapay: # Replace with a single Liberapay username +issuehunt: # Replace with a single IssueHunt username +otechie: # Replace with a single Otechie username +custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2'] From a386449dec9a3f28b323e1004ea59f2dd6960254 Mon Sep 17 00:00:00 2001 From: Kartik Saranathan <278928+Kartiku@users.noreply.github.com> Date: Mon, 15 Mar 2021 05:39:11 -0400 Subject: [PATCH 09/77] book: typo fixes (#175) --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 6ef8ae93..537b6adb 100644 --- a/README.md +++ b/README.md @@ -34,7 +34,7 @@ Each chapter of this book contains a lot of code. If you encounter problems whil ## Exercises -There are few exercises at the end of each chapter of the book. These are ment to test whether you have mastered the knowledge in the current chapter. You can find the possible answer to the problem [here](./exercises). Again, the folder name is the chapter number. +There are few exercises at the end of each chapter of the book. These are meant to test whether you have mastered the knowledge in the current chapter. You can find the possible answer to the problem [here](./exercises). Again, the folder name is the chapter number. ## Website From 4cb055f6292be47405a0fc2b80201a4d2c4f1f4e Mon Sep 17 00:00:00 2001 From: LaChimere Date: Tue, 6 Apr 2021 05:30:43 +0800 Subject: [PATCH 10/77] book: typo fixes (#177) --- book/en-us/04-containers.md | 2 +- book/zh-cn/04-containers.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/04-containers.md b/book/en-us/04-containers.md index bdfe6386..0f04375b 100644 --- a/book/en-us/04-containers.md +++ b/book/en-us/04-containers.md @@ -292,7 +292,7 @@ This will iterate over the tuple: ```cpp for(int i = 0; i != tuple_len(new_tuple); ++i) // runtime indexing - std::cout << tuple_index(i, new_tuple) << std::endl; + std::cout << tuple_index(new_tuple, i) << std::endl; ``` ## Conclusion diff --git a/book/zh-cn/04-containers.md b/book/zh-cn/04-containers.md index a9999a66..d39205db 100644 --- a/book/zh-cn/04-containers.md +++ b/book/zh-cn/04-containers.md @@ -292,7 +292,7 @@ auto tuple_len(T &tpl) { // 迭代 for(int i = 0; i != tuple_len(new_tuple); ++i) // 运行期索引 - std::cout << tuple_index(i, new_tuple) << std::endl; + std::cout << tuple_index(new_tuple, i) << std::endl; ``` ## 总结 From 5e2531058c724d3dccc7343f5b4a0d4c31a0853a Mon Sep 17 00:00:00 2001 From: Umedzhon Abdumuminov Date: Mon, 12 Apr 2021 12:42:50 +0300 Subject: [PATCH 11/77] book: fix anchor link (#181) --- book/en-us/01-intro.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/01-intro.md b/book/en-us/01-intro.md index c44a651b..c28197f9 100644 --- a/book/en-us/01-intro.md +++ b/book/en-us/01-intro.md @@ -55,7 +55,7 @@ For some force majeure and historical reasons, we had to use some C code (even o ![Figure 1.2: Compatabilities between ISO C and ISO C++](../../assets/figures/comparison.png) -From now on, you should have the idea that "C++ is **not** a superset of C" in your mind (and not from the beginning, later [References for further reading] (# further reading references) The difference between C++98 and C99 is given). When writing C++, you should also avoid using program styles such as `void*` whenever possible. When you have to use C, you should pay attention to the use of `extern "C"`, separate the C language code from the C++ code, and then unify the link, for instance: +From now on, you should have the idea that "C++ is **not** a superset of C" in your mind (and not from the beginning, later [References for further reading](#further-readings) The difference between C++98 and C99 is given). When writing C++, you should also avoid using program styles such as `void*` whenever possible. When you have to use C, you should pay attention to the use of `extern "C"`, separate the C language code from the C++ code, and then unify the link, for instance: ```cpp // foo.h From ad4b9580a51082acc83eba88a0207b44e3228d7b Mon Sep 17 00:00:00 2001 From: Dw9 <36155473+Dw9@users.noreply.github.com> Date: Tue, 13 Apr 2021 15:36:31 +0800 Subject: [PATCH 12/77] book: rephrease unique_ptr value capturing (#182) --- book/en-us/03-runtime.md | 2 +- book/zh-cn/03-runtime.md | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index a3efdf63..3a10ac53 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -114,7 +114,7 @@ void lambda_expression_capture() { } ``` -In the above code, `important` is an exclusive pointer that cannot be caught. +In the above code, `important` is an exclusive pointer that cannot be caught by value capture using `=`. At this time we need to transfer it to the rvalue and initialize it in the expression. diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 2c880375..87612c17 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -102,8 +102,7 @@ int main() { } ``` -在上面的代码中，`important` 是一个独占指针，是不能够被捕获到的，这时候我们需要将其转移为右值， -在表达式中初始化。 +在上面的代码中，important 是一个独占指针，是不能够被 "=" 值捕获到，这时候我们可以将其转移为右值，在表达式中初始化。 ### 泛型 Lambda From 45bef893a7edd728af9a019e8e06582e4b8a3287 Mon Sep 17 00:00:00 2001 From: obweix <55910226+obweix@users.noreply.github.com> Date: Fri, 16 Apr 2021 15:01:20 +0800 Subject: [PATCH 13/77] book: typo fixes (#183) --- book/zh-cn/07-thread.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index c41bcc26..f5c67cb5 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -66,7 +66,7 @@ int main() { } ``` -由于 C++ 保证了所有栈对象在声明周期结束时会被销毁，所以这样的代码也是异常安全的。 +由于 C++ 保证了所有栈对象在生命周期结束时会被销毁，所以这样的代码也是异常安全的。 无论 `critical_section()` 正常返回、还是在中途抛出异常，都会引发堆栈回退，也就自动调用了 `unlock()`。 而 `std::unique_lock` 则相对于 `std::lock_guard` 出现的，`std::unique_lock` 更加灵活， From 731a219d89c99047db230873f70cd9972179f57b Mon Sep 17 00:00:00 2001 From: Nikhil Garuda <34582615+Nikhil0504@users.noreply.github.com> Date: Sun, 18 Apr 2021 15:42:26 +0530 Subject: [PATCH 14/77] book: typo and grammar fixes (#185) --- book/en-us/00-preface.md | 20 +-- book/en-us/01-intro.md | 18 +- book/en-us/02-usability.md | 50 +++--- book/en-us/03-runtime.md | 260 ++++++++++++++--------------- book/en-us/04-containers.md | 32 ++-- book/en-us/05-pointers.md | 26 +-- book/en-us/06-regex.md | 74 ++++----- book/en-us/07-thread.md | 316 ++++++++++++++++++------------------ book/en-us/09-others.md | 60 ++++--- book/en-us/10-cpp20.md | 22 +-- 10 files changed, 435 insertions(+), 443 deletions(-) diff --git a/book/en-us/00-preface.md b/book/en-us/00-preface.md index ae620ce4..83835094 100644 --- a/book/en-us/00-preface.md +++ b/book/en-us/00-preface.md @@ -13,33 +13,33 @@ order: 0 C++ user group is fairly large. From the advent of C++98 to the official finalization of C++11, it has accumulated over a decade. C++14/17 is an important complement and optimization for C++11, and C++20 brings this language to the door of modernization. The extended features of all these new standards are given to the C++ language. Infused with new vitality. C++ programmers, who are still using **traditional C++** (this book refers to C++98 and its previous C++ standards as traditional C++), may even amazed by the fact that they are not using the same language while reading modern C++ code. -**Modern C++** (this book refers to C++11/14/17/20) introduces a lot of features into traditional C++, which makes the whole C++ become language that modernized. Modern C++ not only enhances the usability of the C++ language itself, but the modification of the `auto` keyword semantics gives us more confidence in manipulating extremely complex template types. At the same time, a lot of enhancements have been made to the language runtime. The emergence of Lambda expressions has made C++ have the "closure" feature of "anonymous functions", which is almost in modern programming languages ​​(such as Python/Swift/.. It has become commonplace, and the emergence of rvalue references has solved the problem of temporary object efficiency that C++ has long been criticized. +**Modern C++** (this book refers to C++11/14/17/20) introduces a lot of features into traditional C++, which makes the whole C++ become a language that modernized. Modern C++ not only enhances the usability of the C++ language itself, but the modification of the `auto` keyword semantics gives us more confidence in manipulating extremely complex template types. At the same time, a lot of enhancements have been made to the language runtime. The emergence of Lambda expressions has made C++ have the "closure" feature of "anonymous functions", which is almost in modern programming languages ​​(such as Python, Swift, etc). It has become commonplace, and the emergence of rvalue references has solved the problem of temporary object efficiency that C++ has long been criticized for. C++17 is the direction that has been promoted by the C++ community in the past three years. It also points out an important development direction of **modern C++** programming. Although it does not appear as much as C++11, it contains a large number of small and beautiful languages ​​and features (such as structured binding), and the appearance of these features once again corrects our programming paradigm in C++. -Modern C++ also adds a lot of tools and methods to its own standard library, such as `std::thread` at the level of the language itself, which supports concurrent programming and no longer depends on the underlying system on different platforms. The API implements cross-platform support at the language level; `std::regex` provides full regular expression support and more. C++98 has been proven to be a very successful "paradigm", and the emergence of modern C++ further promotes this paradigm, making C++ a better language for system programming and library development. Concepts provide verification on the compile-time of template parameters, further enhancing the usability of the language. +Modern C++ also adds a lot of tools and methods to its standard library, such as `std::thread` at the level of the language itself, which supports concurrent programming and no longer depends on the underlying system on different platforms. The API implements cross-platform support at the language level; `std::regex` provides full regular expression support and more. C++98 has been proven to be a very successful "paradigm", and the emergence of modern C++ further promotes this paradigm, making C++ a better language for system programming and library development. Concepts verify the compile-time of template parameters, further enhancing the usability of the language. In conclusion, as an advocate and practitioner of C++, we always maintain an open mind to accept new things, and we can promote the development of C++ faster, making this old and novel language more vibrant. ## Targets -- This book assumes that readers are already familiar with traditional C++ (i.e. C++98 or earlier), at least they do not have any difficulty in reading traditional C++ code. In other words, those who have long experience in traditional C++ and people who desire to quickly understand the features of modern C++ in a short period of time are well suited to read the book; +- This book assumes that readers are already familiar with traditional C++ (i.e. C++98 or earlier), at least they do not have any difficulty in reading traditional C++ code. In other words, those who have long experience in traditional C++ and people who desire to quickly understand the features of modern C++ in a short period are well suited to read the book; -- This book introduces to a certain extent of the dark magic of modern C++. However, these magics are very limited, they are not suitable for readers who want to learn advanced C++. The purpose of this book is offering a quick start for modern C++. Of course, advanced readers can also use this book to review and examine themselves on modern C++. +- This book introduces to a certain extent of the dark magic of modern C++. However, these magics are very limited, they are not suitable for readers who want to learn advanced C++. The purpose of this book is to offer a quick start for modern C++. Of course, advanced readers can also use this book to review and examine themselves on modern C++. ## Purpose -The book claims "On the Fly". Its intent is to provide a comprehensive introduction to the relevant features regarding modern C++ (before 2020s). +The book claims "On the Fly". It intends to provide a comprehensive introduction to the relevant features regarding modern C++ (before the 2020s). Readers can choose interesting content according to the following table of content to learn and quickly familiarize the new features you would like to learn. -Readers should aware that all of these features are not required. It should be learnt when you really need it. +Readers should aware that all of these features are not required. It should be learned when you need it. -At the same time, instead of grammar-only, the book introduces the historical background as simple as possible of its technical requirements, which provides great help in understanding why these features comes out. +At the same time, instead of grammar-only, the book introduces the historical background as simple as possible of its technical requirements, which provides great help in understanding why these features come out. -In addition, The author would like to encourage that readers should be able to use modern C++ directly in their new projects and migrate their old projects to modern C++ gradually after read the book. +Also, the author would like to encourage that readers should be able to use modern C++ directly in their new projects and migrate their old projects to modern C++ gradually after reading the book. ## Code -Each chapter of this book has a lot of code. If you encounter problems when writing your own code with the introductory features of the book, you might as well read the source code attached to the book. You can find the book [here](../../code). All the code organized by chapter, the folder name is the chapter number. +Each chapter of this book has a lot of code. If you encounter problems when writing your own code with the introductory features of the book, you might as well read the source code attached to the book. You can find the book [here](../../code). All the code is organized by chapter, the folder name is the chapter number. ## Exercises @@ -49,4 +49,4 @@ There are few exercises At the end of each chapter of the book. It is for testin ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/01-intro.md b/book/en-us/01-intro.md index c28197f9..e31087bb 100644 --- a/book/en-us/01-intro.md +++ b/book/en-us/01-intro.md @@ -8,7 +8,7 @@ order: 1 [TOC] -**Compilation Environment**: This book will use `clang++` as the only compiler used, +**Compilation Environment**: This book will use `clang++` as the only compiler used, and always use the `-std=c++2a` compilation flag in your code. ```bash @@ -21,15 +21,15 @@ InstalledDir: /Library/Developer/CommandLineTools/usr/bin ## 1.1 Deprecated Features -Before learning modern C++, let's take a look at the main features that have been deprecated since C++11: +Before learning modern C++, let's take a look at the main features that have deprecated since C++11: -> **Note**: Deprecation is not completely unusable, it is only intended to imply that features will disappear from future standards and should be avoided. However, the deprecated features are still part of the standard library, and most of the features are actually "permanently" reserved for compatibility reasons. +> **Note**: Deprecation is not completely unusable, it is only intended to imply that features will disappear from future standards and should be avoided. But, the deprecated features are still part of the standard library, and most of the features are actually "permanently" reserved for compatibility reasons. - **The string literal constant is no longer allowed to be assigned to a `char *`. If you need to assign and initialize a `char *` with a string literal constant, you should use `const char *` or `auto`.** - ```cpp - char *str = "hello world!"; // A deprecation warning will appear - ``` + ```cpp + char *str = "hello world!"; // A deprecation warning will appear + ``` - **C++98 exception description, `unexpected_handler`, `set_unexpected()` and other related features are deprecated and should use `noexcept`.** @@ -47,11 +47,11 @@ Before learning modern C++, let's take a look at the main features that have bee - ... and many more -There are also other features such as parameter binding (C++11 provides `std::bind` and `std::function`), `export`, and etc. are also deprecated. These features mentioned above **If you have never used or heard of it, please don't try to understand them. You should move closer to the new standard and learn new features directly**. After all, technology is moving forward. +There are also other features such as parameter binding (C++11 provides `std::bind` and `std::function`), `export` etc. are also deprecated. These features mentioned above **If you have never used or heard of it, please don't try to understand them. You should move closer to the new standard and learn new features directly**. After all, technology is moving forward. ## 1.2 Compatibilities with C -For some force majeure and historical reasons, we had to use some C code (even old C code) in C++, for example, Linux system calls. Before the advent of modern C++, most people talked about "what is the difference between C and C++". Generally speaking, in addition to answering the object-oriented class features and the template features of generic programming, there is no other opinion, or even a direct answer. "Almost" is also a lot of people. The Venn diagram in Figure 1.2 roughly answers the C and C++ related compatibility. +For some force majeure and historical reasons, we had to use some C code (even old C code) in C++, for example, Linux system calls. Before the advent of modern C++, most people talked about "what is the difference between C and C++". Generally speaking, in addition to answering the object-oriented class features and the template features of generic programming, there is no other opinion or even a direct answer. "Almost" is also a lot of people. The Venn diagram in Figure 1.2 roughly answers the C and C++ related compatibility. ![Figure 1.2: Compatabilities between ISO C and ISO C++](../../assets/figures/comparison.png) @@ -121,7 +121,7 @@ clean: rm -rf *.o $(TARGET) ``` -> Note: Indentation in `Makefile` is a tab instead of a space character. If you copy this code directly into your editor, the tab may be automatically replaced. Please ensure the indentation in the `Makefile`. It is done by tabs. +> **Note**: Indentation in `Makefile` is a tab instead of a space character. If you copy this code directly into your editor, the tab may be automatically replaced. Please ensure the indentation in the `Makefile` is done by tabs. > > If you don't know the use of `Makefile`, it doesn't matter. In this tutorial, you won't build code that is written too complicated. You can also read this book by simply using `clang++ -std=c++2a` on the command line. diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index e2aadf84..66ff6a46 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -92,12 +92,11 @@ We will discuss them in detail later in the [decltype](#decltype) section. ### constexpr -C++ itself already has the concept of constant expressions, -such as 1+2, 3*4. Such expressions always produce the same result -without any side effects. If the compiler can directly optimize -and embed these expressions into the program at compile time, -it will increase the performance of the program. -A very obvious example is in the definition phase of an array: +C++ itself already has the concept of constant expressions, such as 1+2, +3\*4. Such expressions always produce the same result without any side effects. +If the compiler can directly optimize and embed these expressions into the program at +compile-time, it will increase the performance of the program. A very obvious example +is in the definition phase of an array: ```cpp #include @@ -147,14 +146,14 @@ we need to use the `constexpr` feature introduced in C++11, which will be introd to solve this problem; for `arr_5`, before C++98 The compiler cannot know that `len_foo()` actually returns a constant at runtime, which causes illegal production. -> Note that most compilers now have their own compiler optimizations. +> Note that most compilers now have their compiler optimizations. > Many illegal behaviors become legal under the compiler's optimization. > If you need to reproduce the error, you need to use the old version of the compiler. C++11 provides `constexpr` to let the user explicitly declare that the function or object constructor will become a constant expression at compile time. This keyword explicitly tells the compiler that it should verify that `len_foo` -should be a compile time constant expression. Constant expression. +should be a compile-time constant expression. Constant expression. In addition, the function of `constexpr` can use recursion: @@ -240,7 +239,7 @@ Initialization is a very important language feature, the most common one is when the object is initialized. In traditional C++, different objects have different initialization methods, such as ordinary arrays, PODs (**P**lain **O**ld **D**ata, -ie classes without constructs, destructors, and virtual functions) +i.e. classes without constructs, destructors, and virtual functions) Or struct type can be initialized with `{}`, which is what we call the initialization list. For the initialization of the class object, @@ -332,7 +331,7 @@ provided in other languages. In the chapter on containers, we will learn that C++11 has added a `std::tuple` container for constructing a tuple that encloses multiple return values. But the flaw is that C++11/14 does not provide a simple way to get and define -the elements in the tuple directly from the tuple, +the elements in the tuple from the tuple, although we can unpack the tuple using `std::tie` But we still have to be very clear about how many objects this tuple contains, what type of each object is, very troublesome. @@ -360,7 +359,7 @@ The `auto` type derivation is described in the ## 2.3 Type inference -In traditional C and C++, the types of parameters must be clearly defined, which does not help us to quickly encode, especially when we are faced with a large number of complex template types, we must clearly indicate the type of variables in order to proceed. Subsequent coding, which not only slows down our development efficiency, but also makes the code stinking and long. +In traditional C and C++, the types of parameters must be clearly defined, which does not help us to quickly encode, especially when we are faced with a large number of complex template types, we must indicate the type of variables to proceed. Subsequent coding, which not only slows down our development efficiency but also makes the code stinking and long. C++11 introduces the two keywords `auto` and `decltype` to implement type derivation, letting the compiler worry about the type of the variable. This makes C++ the same as other modern programming languages, in a way that provides the habit of not having to worry about variable types. @@ -415,6 +414,7 @@ auto arr = new auto(10); // arr as int * > **Note**: `auto` cannot be used for function arguments, so the following > is not possible to compile (considering overloading, > we should use templates): +> > ```cpp > int add(auto x, auto y); > @@ -437,7 +437,6 @@ auto arr = new auto(10); // arr as int * The `decltype` keyword is used to solve the defect that the auto keyword can only type the variable. Its usage is very similar to `typeof`: - ```cpp decltype(expression) ``` @@ -485,9 +484,9 @@ R add(T x, U y) { > Note: There is no difference between typename and class in the template parameter list. Before the keyword typename appears, class is used to define the template parameters. However, when defining a variable with [nested dependency type](http://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names) in the template, you need to use typename to eliminate ambiguity. -Such code is actually very ugly, because the programmer must explicitly +Such code is very ugly because the programmer must explicitly indicate the return type when using this template function. -But in fact we don't know what kind of operation +But in fact, we don't know what kind of operation the `add()` function will do, and what kind of return type to get. This problem was solved in C++11. Although you may immediately @@ -583,7 +582,7 @@ decltype(auto) look_up_a_string_2() { ### if constexpr -As we saw at the beginning of this chapter, we know that C++11 introduces the `constexpr` keyword, which compiles expressions or functions into constant results. A natural idea is that if we introduce this feature into the conditional judgment, let the code complete the branch judgment at compile time, can it make the program more efficient? C++17 introduces the `constexpr` keyword into the `if` statement, allowing you to declare the condition of a constant expression in your code. Consider the following code: +As we saw at the beginning of this chapter, we know that C++11 introduces the `constexpr` keyword, which compiles expressions or functions into constant results. A natural idea is that if we introduce this feature into the conditional judgment, let the code complete the branch judgment at compile-time, can it make the program more efficient? C++17 introduces the `constexpr` keyword into the `if` statement, allowing you to declare the condition of a constant expression in your code. Consider the following code: ```cpp #include @@ -619,7 +618,7 @@ int main() { ### Range-based for loop -Finally, C++11 introduces a range-based iterative method, and we have the ability to write loops that are as concise +Finally, C++11 introduces a range-based iterative method, and we can write loops that are as concise as Python, and we can further simplify the previous example: ```cpp @@ -642,7 +641,7 @@ int main() { ## 2.5 Templates -C++ templates have always been a special art of the language, and templates can even be used independently as a new language. The philosophy of the template is to throw all the problems that can be processed at compile time into the compile time, and only deal with those core dynamic services at runtime, so as to greatly optimize the performance of the runtime. Therefore, templates are also regarded by many as one of the black magic of C++. +C++ templates have always been a special art of the language, and templates can even be used independently as a new language. The philosophy of the template is to throw all the problems that can be processed at compile time into the compile time, and only deal with those core dynamic services at runtime, to greatly optimize the performance of the runtime. Therefore, templates are also regarded by many as one of the black magic of C++. ### Extern templates @@ -697,7 +696,7 @@ typedef MagicType, std::string> FakeDarkMagic; C++11 uses `using` to introduce the following form of writing, and at the same time supports the same effect as the traditional `typedef`: -> Usually we use `typedef` to define the alias syntax: `typedef original name new name; `, but the definition syntax for aliases such as function pointers is different, which usually causes a certain degree of difficulty for direct reading. +> Usually, we use `typedef` to define the alias syntax: `typedef original name new name; `, but the definition syntax for aliases such as function pointers is different, which usually causes a certain degree of difficulty for direct reading. ```cpp typedef int (*process)(void *); @@ -746,7 +745,7 @@ and there is no need to fix the number of parameters when defining. template class Magic; ``` -The template class Magic object can accept unrestricted number of typename as +The template class Magic object can accept an unrestricted number of typename as a formal parameter of the template, such as the following definition: ```cpp @@ -799,7 +798,6 @@ the parameter package, but there are two classic processing methods: Recursion is a very easy way to think of and the most classic approach. This method continually recursively passes template parameters to the function, thereby achieving the purpose of recursively traversing all template parameters: - ```cpp #include template @@ -833,7 +831,7 @@ void printf2(T0 t0, T... t) { **3. Initialize list expansion** -Recursive template functions are a standard practice, but the obvious drawback is that you must define a function that terminates recursion. +Recursive template functions are standard practice, but the obvious drawback is that you must define a function that terminates recursion. Here is a description of the black magic that is expanded using the initialization list: @@ -880,7 +878,7 @@ auto add(T t, U u) { The parameters of the template `T` and `U` are specific types. But there is also a common form of template parameter that allows different literals -to be template parameters, ie non-type template parameters: +to be template parameters, i.e. non-type template parameters: ```cpp template @@ -896,7 +894,7 @@ buffer_t buf; // 100 as template parameter ``` In this form of template parameters, we can pass `100` as a parameter to the template. -After C++11 introduced the feature of type derivation, we will naturally ask, since the template parameters here +After C++11 introduced the feature of type derivation, we will naturally ask, since the template parameters here. Passing with a specific literal, can the compiler assist us in type derivation, By using the placeholder `auto`, there is no longer a need to explicitly specify the type? Fortunately, C++17 introduces this feature, and we can indeed use the `auto` keyword to let the compiler assist in the completion of specific types of derivation. @@ -1022,7 +1020,7 @@ struct SubClass3: Base { ### Explicit delete default function -In traditional C++, if the programmer does not provide it, the compiler will default to generating default constructors, copy constructs, assignment operators, and destructors for the object. In addition, C++ also defines operators such as `new` `delete` for all classes. This part of the function can be overridden when the programmer needs it. +In traditional C++, if the programmer does not provide it, the compiler will default to generating default constructors, copy constructs, assignment operators, and destructors for the object. Besides, C++ also defines operators such as `new` `delete` for all classes. This part of the function can be overridden when the programmer needs it. This raises some requirements: the ability to accurately control the generation of default functions cannot be controlled. For example, when copying a class is prohibited, the copy constructor and the assignment operator must be declared as `private`. Trying to use these undefined functions will result in compilation or link errors, which is a very unconventional way. @@ -1041,7 +1039,7 @@ class Magic { ### Strongly typed enumerations -In traditional C++, enumerated types are not type-safe, and enumerated types are treated as integers, which allows two completely different enumerated types to be directly compared (although the compiler gives the check, but not all) , ** Even the enumeration value names of different enum types in the same namespace cannot be the same**, which is usually not what we want to see. +In traditional C++, enumerated types are not type-safe, and enumerated types are treated as integers, which allows two completely different enumerated types to be directly compared (although the compiler gives the check, but not all), ** Even the enumeration value names of different enum types in the same namespace cannot be the same**, which is usually not what we want to see. C++11 introduces an enumeration class and declares it using the syntax of `enum class`: @@ -1085,7 +1083,7 @@ std::cout << new_enum::value3 << std::endl This section introduces the enhancements to language usability in modern C++, which I believe are the most important features that almost everyone needs to know and use: -1. auto type derivation +1. Auto type derivation 2. Scope for iteration 3. Initialization list 4. Variable parameter template diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 3a10ac53..f7a71c97 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -10,9 +10,9 @@ order: 3 ## 3.1 Lambda Expression -Lambda expressions are one of the most important features in modern C++, and Lambda expressions actually provide a feature like anonymous functions. -Anonymous functions are used when a function is needed, but you don’t want to use name to call a function. There are actually many, many scenes like this. -So anonymous functions are almost standard on modern programming languages. +Lambda expressions are one of the most important features in modern C++, and Lambda expressions provide a feature like anonymous functions. +Anonymous functions are used when a function is needed, but you don’t want to use a name to call a function. There are many, many scenes like this. +So anonymous functions are almost standard in modern programming languages. ### Basics @@ -24,22 +24,22 @@ The basic syntax of a Lambda expression is as follows: } ``` -The above grammar rules are well understood except for the things in `[capture list]`, +The above grammar rules are well understood except for the things in `[capture list]`, except that the function name of the general function is omitted. -The return value is in the form of a `->` +The return value is in the form of a `->` (we have already mentioned this in the tail return type earlier in the previous section). -The so-called capture list can be understood as a type of parameter. -The internal function body of a lambda expression cannot use variables outside +The so-called capture list can be understood as a type of parameter. +The internal function body of a lambda expression cannot use variables outside the body of the function by default. -At this time, the capture list can serve to transfer external data. -According to the behavior passed, +At this time, the capture list can serve to transfer external data. +According to the behavior passed, the capture list is also divided into the following types: #### 1. Value capture -Similar to parameter passing, the value capture is based on the fact that -the variable can be copied, except that the captured variable is copied +Similar to parameter passing, the value capture is based on the fact that +the variable can be copied, except that the captured variable is copied when the lambda expression is created, not when it is called: ```cpp @@ -76,13 +76,13 @@ void lambda_reference_capture() { #### 3. Implicit capture -Manually writing a capture list is sometimes very complicated. -This mechanical work can be handled by the compiler. -At this point, you can write a `&` or `=` to the compiler to +Manually writing a capture list is sometimes very complicated. +This mechanical work can be handled by the compiler. +At this point, you can write a `&` or `=` to the compiler to declare the reference or value capture. -To summarize, capture provides the ability for lambda expressions -to use external values. The four most common forms of +To summarize, capture provides the ability for lambda expressions +to use external values. The four most common forms of capture lists can be: - \[\] empty capture list @@ -92,16 +92,16 @@ capture lists can be: #### 4. Expression capture -> This section needs to understand the rvalue references and smart pointers that +> This section needs to understand the rvalue references and smart pointers that > will be mentioned later. -The value captures and reference captures mentioned above are variables that have been -declared in the outer scope, so these capture methods capture the lvalue +The value captures and reference captures mentioned above are variables that have been +declared in the outer scope, so these capture methods capture the lvalue and not capture the rvalue. -C++14 gives us the convenience of allowing the captured members to be initialized +C++14 gives us the convenience of allowing the captured members to be initialized with arbitrary expressions, which allows the capture of rvalues. -The type of the captured variable being declared is judged according to the expression, +The type of the captured variable being declared is judged according to the expression, and the judgment is the same as using `auto`: ```cpp @@ -114,20 +114,20 @@ void lambda_expression_capture() { } ``` -In the above code, `important` is an exclusive pointer that cannot be caught by value capture using `=`. -At this time we need to transfer it to the rvalue and +In the above code, `important` is an exclusive pointer that cannot be caught by value capture using `=`. +At this time we need to transfer it to the rvalue and initialize it in the expression. ### Generic Lambda -In the previous section we mentioned that the `auto` keyword cannot be used +In the previous section, we mentioned that the `auto` keyword cannot be used in the parameter list because it would conflict with the functionality of the template. But Lambda expressions are not ordinary functions, so Lambda expressions are not templated. -This has caused us some trouble: the parameter table cannot be generalized, +This has caused us some trouble: the parameter table cannot be generalized, and the parameter table type must be clarified. Fortunately, this trouble only exists in C++11, starting with C++14. -The formal parameters of the Lambda function can use the `auto` keyword +The formal parameters of the Lambda function can use the `auto` keyword to generate generic meanings: ```cpp @@ -135,7 +135,7 @@ void lambda_generic() { auto generic = [](auto x, auto y) { return x+y; }; - + std::cout << generic(1, 2) << std::endl; std::cout << generic(1.1, 2.2) << std::endl; } @@ -143,15 +143,15 @@ void lambda_generic() { ## 3.2 Function Object Wrapper -Although the features are part of the standard library and not found in runtime, +Although the features are part of the standard library and not found in runtime, it enhances the runtime capabilities of the C++ language. -This part of the content is also very important, so put it here for introduction. +This part of the content is also very important, so put it here for the introduction. ### `std::function` -The essence of a Lambda expression is an object of a class type (called a closure type) +The essence of a Lambda expression is an object of a class type (called a closure type) that is similar to a function object type (called a closure object). -When the capture list of a Lambda expression is empty, the closure object +When the capture list of a Lambda expression is empty, the closure object can also be converted to a function pointer value for delivery, for example: ```cpp @@ -170,20 +170,19 @@ int main() { } ``` -The above code gives two different forms of invocation, one is to call Lambda -as a function type, and the other is to directly call a Lambda expression. -In C++11, these concepts are unified. -The type of object that can be called is collectively called the callable type. +The above code gives two different forms of invocation, one is to call Lambda +as a function type, and the other is to directly call a Lambda expression. +In C++11, these concepts are unified. +The type of object that can be called is collectively called the callable type. This type is introduced by `std::function`. -C++11 `std::function` is a generic, polymorphic function wrapper -whose instances can store, copy, and call any target entity that can be called. -It is also an existing callable to C++. A type-safe package of entities (relatively, -the call to a function pointer is not type-safe), in other words, -a container of functions. When we have a container for functions, +C++11 `std::function` is a generic, polymorphic function wrapper +whose instances can store, copy, and call any target entity that can be called. +It is also an existing callable to C++. A type-safe package of entities (relatively, +the call to a function pointer is not type-safe), in other words, +a container of functions. When we have a container for functions, we can more easily handle functions and function pointers as objects. e.g: - ```cpp #include #include @@ -207,10 +206,10 @@ int main() { ### `std::bind` and `std::placeholder` -And `std::bind` is used to bind the parameters of the function call. -It solves the requirement that we may not always be able to get all the parameters -of a function at one time. Through this function, we can Part of the call parameters -are bound to the function in advance to become a new object, +And `std::bind` is used to bind the parameters of the function call. +It solves the requirement that we may not always be able to get all the parameters +of a function at one time. Through this function, we can Part of the call parameters +are bound to the function in advance to become a new object, and then complete the call after the parameters are complete. e.g: ```cpp @@ -226,38 +225,38 @@ int main() { } ``` -> **Tip:** Note the magic of the `auto` keyword. Sometimes we may not be familiar +> **Tip:** Note the magic of the `auto` keyword. Sometimes we may not be familiar > with the return type of a function, but we can circumvent this problem by using `auto`. ## 3.3 rvalue Reference -rvalue references are one of the important features introduced by C++11 -that are synonymous with Lambda expressions. Its introduction solves +rvalue references are one of the important features introduced by C++11 +that are synonymous with Lambda expressions. Its introduction solves a large number of historical issues in C++. -Eliminating extra overhead such as `std::vector`, `std::string`, +Eliminating extra overhead such as `std::vector`, `std::string`, and making the function object container `std::function` possible. ### lvalue, rvalue, prvalue, xvalue -To understand what the rvalue reference is all about, you must have a clear +To understand what the rvalue reference is all about, you must have a clear understanding of the lvalue and the rvalue. -**lvalue, left value**, as the name implies, is the value to the left of the assignment -symbol. To be precise, an lvalue is a persistent object that still exists after +**lvalue, left value**, as the name implies, is the value to the left of the assignment +symbol. To be precise, an lvalue is a persistent object that still exists after an expression (not necessarily an assignment expression). -**Rvalue, right value**, the value on the right refers to the temporary object +**Rvalue, right value**, the value on the right refers to the temporary object that no longer exists after the expression ends. -In C++11, in order to introduce powerful rvalue references, -the concept of rvalue values ​​is further divided into: +In C++11, in order to introduce powerful rvalue references, +the concept of rvalue values ​​is further divided into: prvalue, and xvalue. -**pvalue, pure rvalue**, purely rvalue, either purely literal, -such as `10`, `true`; either the result of the evaluation is equivalent to -a literal or anonymous temporary object, for example `1+2`. -Temporary variables returned by non-references, temporary variables generated -by operation expressions, original literals, and Lambda expressions +**pvalue, pure rvalue**, purely rvalue, either purely literal, +such as `10`, `true`; either the result of the evaluation is equivalent to +a literal or anonymous temporary object, for example `1+2`. +Temporary variables returned by non-references, temporary variables generated +by operation expressions, original literals, and Lambda expressions are all pure rvalue values. Note that a string literal became rvalue in a class, and remains an lvalue in other cases (e.g., in a function)： @@ -276,11 +275,11 @@ int main() { } ``` -**xvalue, expiring value** is the concept proposed by C++11 to introduce -rvalue references (so in traditional C++, pure rvalue and rvalue are the same concept), +**xvalue, expiring value** is the concept proposed by C++11 to introduce +rvalue references (so in traditional C++, pure rvalue and rvalue are the same concepts), a value that is destroyed but can be moved. -It would be a little hard to understand the xvalue, +It would be a little hard to understand the xvalue, let's look at the code like this: ```cpp @@ -292,33 +291,33 @@ std::vector foo() { std::vector v = foo(); ``` -In such code, as far as the traditional understanding is concerned, -the return value `temp` of the function `foo` is internally created -and then assigned to `v`, whereas when `v` gets this object, the entire `temp` is copied. -And then destroy `temp`, if this `temp` is very large, this will cause a lot of extra -overhead (this is the problem that traditional C++ has been criticized for). -In the last line, `v` is the lvalue, and the value returned by `foo()` is -the rvalue (which is also a pure rvalue). -However, `v` can be caught by other variables, and the return value generated -by `foo()` is used as a temporary value. Once copied by `v`, -it will be destroyed immediately, and cannot be obtained or modified. -The xvalue defines an behavior in which temporary values ​​can be identified -while being able to be moved. - -After C++11, the compiler did some work for us, where the lvalue `temp` -is subjected to this implicit rvalue conversion, -equivalent to `static_cast &&>(temp)`, -where `v` here moves the value returned by `foo` locally. +In such code, as far as the traditional understanding is concerned, +the return value `temp` of the function `foo` is internally created +and then assigned to `v`, whereas when `v` gets this object, the entire `temp` is copied. +And then destroy `temp`, if this `temp` is very large, this will cause a lot of extra +overhead (this is the problem that traditional C++ has been criticized for). +In the last line, `v` is the lvalue, and the value returned by `foo()` is +the rvalue (which is also a pure rvalue). + +However, `v` can be caught by other variables, and the return value generated by `foo()` +is used as a temporary value. Once copied by `v`, it will be destroyed immediately, and +cannot be obtained or modified. The xvalue defines behavior in which temporary values ​​can be +identified while being able to be moved. + +After C++11, the compiler did some work for us, where the lvalue `temp` +is subjected to this implicit rvalue conversion, +equivalent to `static_cast &&>(temp)`, +where `v` here moves the value returned by `foo` locally. This is the move semantics we will mention later. ### rvalue reference and lvalue reference -To get a xvalue, you need to use the declaration of the rvalue reference: `T &&`, +To get a xvalue, you need to use the declaration of the rvalue reference: `T &&`, where `T` is the type. -The statement of the rvalue reference extends the lifecycle of this temporary value, +The statement of the rvalue reference extends the lifecycle of this temporary value, and as long as the variable is alive, the xvalue will continue to survive. -C++11 provides the `std::move` method to unconditionally convert +C++11 provides the `std::move` method to unconditionally convert lvalue parameters to rvalues. With it we can easily get a rvalue temporary object, for example: @@ -339,25 +338,25 @@ int main() // std::string&& r1 = s1; // illegal, rvalue can't ref to lvalue std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue std::cout << rv1 << std::endl; // string, - + const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can extend temp variable's lifecycle // lv2 += "Test"; // illegal, const ref can't be modified std::cout << lv2 << std::endl; // string,string - + std::string&& rv2 = lv1 + lv2; // legal, rvalue ref extend lifecycle rv2 += "string"; // legal, non-const reference can be modified std::cout << rv2 << std::endl; // string,string,string,string - + reference(rv2); // output: lvalue - + return 0; } ``` -`rv2` refers to an rvalue, but since it is a reference, +`rv2` refers to an rvalue, but since it is a reference, `rv2` is still an lvalue. -Note that there is a very interesting historical issue here, +Note that there is a very interesting historical issue here, let's look at the following code: ```cpp @@ -371,7 +370,7 @@ int main() { } ``` -The first question, why not allow non-linear references to bind to non-lvalues? +The first question, why not allow non-linear references to bind to non-lvalues? This is because there is a logic error in this approach: ```cpp @@ -384,28 +383,28 @@ void foo() { } ``` -Since `int&` can't reference a parameter of type `double`, +Since `int&` can't reference a parameter of type `double`, you must generate a temporary value to hold the value of `s`. -Thus, when `increase()` modifies this temporary value, +Thus, when `increase()` modifies this temporary value, `s` itself is not modified after the call is completed. -The second question, why do constant references allow binding to non-lvalues? +The second question, why do constant references allow binding to non-lvalues? The reason is simple because Fortran needs it. ### Move semantics -Traditional C++ has designed the concept of copy/copy for class objects -through copy constructors and assignment operators, -but in order to implement the movement of resources, -The caller must use the method of copying and then destructing first, -otherwise you need to implement the interface of the mobile object yourself. -Imagine moving your home directly to your new home instead of +Traditional C++ has designed the concept of copy/copy for class objects +through copy constructors and assignment operators, +but to implement the movement of resources, +The caller must use the method of copying and then destructing first, +otherwise, you need to implement the interface of the mobile object yourself. +Imagine moving your home directly to your new home instead of copying everything (rebuy) to your new home. Throwing away (destroying) all the original things is a very anti-human thing. -Traditional C++ does not distinguish between the concepts of "mobile" and "copy", +Traditional C++ does not distinguish between the concepts of "mobile" and "copy", resulting in a large amount of data copying, wasting time and space. -The appearance of rvalue references solves the confusion of these two concepts, +The appearance of rvalue references solves the confusion of these two concepts, for example: ```cpp @@ -413,19 +412,19 @@ for example: class A { public: int *pointer; - A():pointer(new int(1)) { - std::cout << "construct" << pointer << std::endl; + A():pointer(new int(1)) { + std::cout << "construct" << pointer << std::endl; } - A(A& a):pointer(new int(*a.pointer)) { - std::cout << "copy" << pointer << std::endl; + A(A& a):pointer(new int(*a.pointer)) { + std::cout << "copy" << pointer << std::endl; } // meaningless object copy - A(A&& a):pointer(a.pointer) { + A(A&& a):pointer(a.pointer) { a.pointer = nullptr; - std::cout << "move" << pointer << std::endl; + std::cout << "move" << pointer << std::endl; } - ~A(){ - std::cout << "destruct" << pointer << std::endl; - delete pointer; + ~A(){ + std::cout << "destruct" << pointer << std::endl; + delete pointer; } }; // avoid compiler optimization @@ -448,7 +447,7 @@ In the code above: 1. First construct two `A` objects inside `return_rvalue`, and get the output of the two constructors; 2. After the function returns, it will generate a xvalue, which is referenced by the moving structure of `A` (`A(A&&)`), thus extending the life cycle, and taking the pointer in the rvalue and saving it to `obj`. In the middle, the pointer to the xvalue is set to `nullptr`, which prevents the memory area from being destroyed. -This avoids meaningless copy constructs and enhances performance. +This avoids meaningless copy constructs and enhances performance. Let's take a look at an example involving a standard library: ```cpp @@ -458,28 +457,28 @@ Let's take a look at an example involving a standard library: #include // std::string int main() { - + std::string str = "Hello world."; std::vector v; - + // use push_back(const T&), copy v.push_back(str); // "str: Hello world." std::cout << "str: " << str << std::endl; - + // use push_back(const T&&), no copy // the string will be moved to vector, and therefore std::move can reduce copy cost v.push_back(std::move(str)); // str is empty now std::cout << "str: " << str << std::endl; - + return 0; } ``` ### Perfect forwarding -As we mentioned earlier, the rvalue reference of a declaration is actually an lvalue. +As we mentioned earlier, the rvalue reference of a declaration is actually an lvalue. This creates problems for us to parameterize (pass): ```cpp @@ -513,21 +512,21 @@ Therefore `reference(v)` will call `reference(int&)` and output lvalue. For `pass(l)`, `l` is an lvalue, why is it successfully passed to `pass(T&&)`? This is based on the **reference collapsing rule**: In traditional C++, we are not able to continue to reference a reference type. -However, -C++ has relaxed this practice with the advent of rvalue references, -resulting in a reference collapse rule that allows us to reference references, +However, +C++ has relaxed this practice with the advent of rvalue references, +resulting in a reference collapse rule that allows us to reference references, both lvalue and rvalue. But follow the rules below: | Function parameter type | Argument parameter type | Post-derivation function parameter type | -| :--------: | :--------: | :-------------: | -| T& | lvalue ref | T& | -| T& | rvalue ref | T& | -| T&& | lvalue ref | T& | -| T&& | rvalue ref | T&& | +| :---------------------: | :---------------------: | :-------------------------------------: | +| T& | lvalue ref | T& | +| T& | rvalue ref | T& | +| T&& | lvalue ref | T& | +| T&& | rvalue ref | T&& | Therefore, the use of `T&&` in a template function may not be able to make an rvalue reference, and when a lvalue is passed, a reference to this function will be derived as an lvalue. More precisely, ** no matter what type of reference the template parameter is, the template parameter can be derived as a right reference type** if and only if the argument type is a right reference. -This makes `v` a successful delivery of lvalues. +This makes `v` successful delivery of lvalues. Perfect forwarding is based on the above rules. The so-called perfect forwarding is to let us pass the parameters, Keep the original parameter type (lvalue reference keeps lvalue reference, rvalue reference keeps rvalue reference). @@ -556,11 +555,11 @@ void pass(T&& v) { int main() { std::cout << "rvalue pass:" << std::endl; pass(1); - + std::cout << "lvalue pass:" << std::endl; int l = 1; pass(l); - + return 0; } ``` @@ -583,11 +582,11 @@ static_cast param passing: lvalue reference Regardless of whether the pass parameter is an lvalue or an rvalue, the normal pass argument will forward the argument as an lvalue. So `std::move` will always accept an lvalue, which forwards the call to `reference(int&&)` to output the rvalue reference. -Only `std::forward` does not cause any extra copies, and ** perfectly forwards ** (passes) the arguments of the function to other functions that are called internally. +Only `std::forward` does not cause any extra copies and ** perfectly forwards ** (passes) the arguments of the function to other functions that are called internally. `std::forward` is the same as `std::move`, and nothing is done. `std::move` simply converts the lvalue to the rvalue. `std::forward` is just a simple conversion of the parameters. From the point of view of the phenomenon, -`std::forward(v)` is exactly the same as `static_cast(v)`. +`std::forward(v)` is the same as `static_cast(v)`. Readers may be curious as to why a statement can return values for two types of returns. Let's take a quick look at the concrete implementation of `std::forward`. `std::forward` contains two overloads: @@ -614,7 +613,7 @@ When `std::forward` accepts an lvalue, `_Tp` is deduced to the lvalue, so the re `_Tp` is derived as an rvalue reference, and based on the collapse rule, the return value becomes the rvalue of `&& + &&`. It can be seen that the principle of `std::forward` is to make clever use of the differences in template type derivation. -At this point we can answer the question: Why is `auto&&` the safest way to use looping statements? +At this point, we can answer the question: Why is `auto&&` the safest way to use looping statements? Because when `auto` is pushed to a different lvalue and rvalue reference, the collapsed combination with `&&` is perfectly forwarded. ## Conclusion @@ -622,6 +621,7 @@ Because when `auto` is pushed to a different lvalue and rvalue reference, the co This chapter introduces the most important runtime enhancements in modern C++, and I believe that all the features mentioned in this section are worth knowing: Lambda expression + 1. Function object container std::function 2. rvalue reference diff --git a/book/en-us/04-containers.md b/book/en-us/04-containers.md index 0f04375b..96842464 100644 --- a/book/en-us/04-containers.md +++ b/book/en-us/04-containers.md @@ -12,13 +12,13 @@ order: 4 ### `std::array` -When you see this container, you will definitely have this problem: +When you see this container, you will have this problem: 1. Why introduce `std::array` instead of `std::vector` directly? 2. Already have a traditional array, why use `std::array`? -First answer the first question. Unlike `std::vector`, the size of the `std::array` object is fixed. If the container size is fixed, then the `std::array` container can be used first. -In addition, since `std::vector` is automatically expanded, when a large amount of data is stored, and the container is deleted, +First, answer the first question. Unlike `std::vector`, the size of the `std::array` object is fixed. If the container size is fixed, then the `std::array` container can be used first. +Also, since `std::vector` is automatically expanded, when a large amount of data is stored, and the container is deleted, The container does not automatically return the corresponding memory of the deleted element. In this case, you need to manually run `shrink_to_fit()` to release this part of the memory. ```cpp @@ -26,9 +26,9 @@ std::vector v; std::cout << "size:" << v.size() << std::endl; // output 0 std::cout << "capacity:" << v.capacity() << std::endl; // output 0 -// As you can see, the storage of std::vector is automatically managed and +// As you can see, the storage of std::vector is automatically managed and // automatically expanded as needed. -// But if there is not enough space, you need to redistribute more memory, +// But if there is not enough space, you need to redistribute more memory, // and reallocating memory is usually a performance-intensive operation. v.push_back(1); v.push_back(2); @@ -42,9 +42,9 @@ v.push_back(5); std::cout << "size:" << v.size() << std::endl; // output 5 std::cout << "capacity:" << v.capacity() << std::endl; // output 8 -// As can be seen below, although the container empties the element, +// As can be seen below, although the container empties the element, // the memory of the emptied element is not returned. -v.clear(); +v.clear(); std::cout << "size:" << v.size() << std::endl; // output 0 std::cout << "capacity:" << v.capacity() << std::endl; // output 8 @@ -103,7 +103,7 @@ std::sort(arr.begin(), arr.end()); ### `std::forward_list` -`std::forward_list` is a list container, and the usage is basically similar to `std::list`, so we don't spend a lot of time introducing it. +`std::forward_list` is a list container, and the usage is similar to `std::list`, so we don't spend a lot of time introducing it. Need to know is that, unlike the implementation of the doubly linked list of `std::list`, `std::forward_list` is implemented using a singly linked list. Provides element insertion of `O(1)` complexity, does not support fast random access (this is also a feature of linked lists), @@ -115,7 +115,7 @@ We are already familiar with the ordered container `std::map`/`std::set` in trad The average complexity of inserts and searches is `O(log(size))`. When inserting an element, the element size is compared according to the `<` operator and the element is determined to be the same. And select the appropriate location to insert into the container. When traversing the elements in this container, the output will be traversed one by one in the order of the `<` operator. -The elements in the unordered container are not sorted, and the internals are implemented by the Hash table. The average complexity of inserting and searching for elements is `O(constant)`, +The elements in the unordered container are not sorted, and the internals is implemented by the Hash table. The average complexity of inserting and searching for elements is `O(constant)`, Significant performance gains can be achieved without concern for the order of the elements inside the container. C++11 introduces two sets of unordered containers: `std::unordered_map`/`std::unordered_multimap` and @@ -142,12 +142,12 @@ int main() { {3, "3"}, {2, "2"} }; - + // iterates in the same way std::cout << "std::unordered_map" << std::endl; for( const auto & n : u) std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n"; - + std::cout << std::endl; std::cout << "std::map" << std::endl; for( const auto & n : v) @@ -256,8 +256,8 @@ constexpr std::variant tuple_index(const std::tuple& tpl, size_t i) return _tuple_index<0>(tpl, i); } template -std::ostream & operator<< (std::ostream & s, std::variant const & v) { - std::visit([&](auto && x){ s << x;}, v); +std::ostream & operator<< (std::ostream & s, std::variant const & v) { + std::visit([&](auto && x){ s << x;}, v); return s; } ``` @@ -278,7 +278,7 @@ auto new_tuple = std::tuple_cat(get_student(1), std::move(t)); ``` You can immediately see how quickly you can traverse a tuple? But we just introduced how to index a `tuple` by a very number at runtime, then the traversal becomes simpler. -First we need to know the length of a tuple, which can: +First, we need to know the length of a tuple, which can: ```cpp template @@ -297,7 +297,7 @@ for(int i = 0; i != tuple_len(new_tuple); ++i) ## Conclusion -This chapter briefly introduces the new containers in modern C++. Their usage is similar to that of the existing containers in C++. It is relatively simple, and you can choose the containers you need to use according to the actual scene, so as to get better performance. +This chapter briefly introduces the new containers in modern C++. Their usage is similar to that of the existing containers in C++. It is relatively simple, and you can choose the containers you need to use according to the actual scene, to get better performance. Although `std::tuple` is effective, the standard library provides limited functionality and there is no way to meet the requirements of runtime indexing and iteration. Fortunately, we have other methods that we can implement on our own. @@ -305,4 +305,4 @@ Although `std::tuple` is effective, the standard library provides limited functi ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index 4f30d8d5..90c83b41 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -18,11 +18,11 @@ In traditional C++, "remembering" to manually release resources is not always a So the usual practice is that for an object, we apply for space when constructor, and free space when the destructor (called when leaving the scope). That is, we often say that the RAII resource acquisition is the initialization technology. -There are exceptions to everything, we always have the need to allocate objects on free storage. In traditional C++ we have to use `new` and `delete` to "remember" to release resources. C++11 introduces the concept of smart pointers, using the idea of ​​reference counting, so that programmers no longer need to care about manually releasing memory. +There are exceptions to everything, we always need to allocate objects on free storage. In traditional C++ we have to use `new` and `delete` to "remember" to release resources. C++11 introduces the concept of smart pointers, using the idea of ​​reference counting so that programmers no longer need to care about manually releasing memory. These smart pointers include `std::shared_ptr`/`std::unique_ptr`/`std::weak_ptr`, which need to include the header file ``. > Note: The reference count is not garbage collection. The reference count can recover the objects that are no longer used as soon as possible, and will not cause long waits during the recycling process. -> More clearly and clearly indicate the life cycle of resources. +> More clearly and indicate the life cycle of resources. ## 5.2 `std::shared_ptr` @@ -86,7 +86,7 @@ std::unique_ptr pointer2 = pointer; // illegal ``` > `make_unique` is not complicated. C++11 does not provide `std::make_unique`, which can be implemented by itself: -> +> > ```cpp > template > std::unique_ptr make_unique( Args&& ...args ) { @@ -114,30 +114,30 @@ void f(const Foo &) { int main() { std::unique_ptr p1(std::make_unique()); - + // p1 is not empty, prints if (p1) p1->foo(); { std::unique_ptr p2(std::move(p1)); - + // p2 is not empty, prints f(*p2); - + // p2 is not empty, prints if(p2) p2->foo(); - + // p1 is empty, no prints if(p1) p1->foo(); - + p1 = std::move(p2); - + // p2 is empty, no prints if(p2) p2->foo(); std::cout << "p2 was destroyed" << std::endl; } // p1 is not empty, prints if (p1) p1->foo(); - + // Foo instance will be destroyed when leaving the scope } ``` @@ -172,12 +172,12 @@ int main() { std::shared_ptr b = std::make_shared(); a->pointer = b; b->pointer = a; - + return 0; } ``` -The result is that A and B will not be destroyed. This is because the pointer inside a, b also references `a, b`, which makes the reference count of `a, b` become 2, leaving the scope. When the `a, b` smart pointer is destructed, it can only cause the reference count of this area to be decremented by one. This causes the memory area reference count pointed to by the `a, b` object to be non-zero, but the external has no way to find this area, it also caused a memory leak, as shown in Figure 5.1: +The result is that A and B will not be destroyed. This is because the pointer inside a, b also references `a, b`, which makes the reference count of `a, b` becomes 2, leaving the scope. When the `a, b` smart pointer is destructed, it can only cause the reference count of this area to be decremented by one. This causes the memory area reference count pointed to by the `a, b` object to be non-zero, but the external has no way to find this area, it also caused a memory leak, as shown in Figure 5.1: ![Figure 5.1](../../assets/figures/pointers1_en.png) @@ -187,7 +187,7 @@ The solution to this problem is to use the weak reference pointer `std::weak_ptr In the above figure, only B is left in the last step, and B does not have any smart pointers to reference it, so this memory resource will also be released. -`std::weak_ptr` has no `*` operator and `->` operator, so it can't operate on resources. Its only function is to check if `std::shared_ptr` exists, its `expired()` method can return `false` when the resource is not released, otherwise it returns `true`. +`std::weak_ptr` has no `*` operator and `->` operator, so it can't operate on resources. Its only function is to check if `std::shared_ptr` exists, its `expired()` method can return `false` when the resource is not released, otherwise, it returns `true`. ## Conclusion diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index b3bd3720..5793645a 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -10,64 +10,62 @@ order: 6 ## 6.1 Introduction -Regular expressions are not part of the C++ language and therefore we only briefly +Regular expressions are not part of the C++ language and therefore we only briefly introduced it here. -Regular expressions describe a pattern of string matching. -The general use of regular expressions is mainly to achieve +Regular expressions describe a pattern of string matching. +The general use of regular expressions is mainly to achieve the following three requirements: 1. Check if a string contains some form of substring; 2. Replace the matching substrings; 3. Take the eligible substring from a string. -Regular expressions are text patterns consisting of ordinary characters (such as a to z) -and special characters. A pattern describes one or more strings to match when searching for text. +Regular expressions are text patterns consisting of ordinary characters (such as a to z) +and special characters. A pattern describes one or more strings to match when searching for text. Regular expressions act as a template to match a character pattern to the string being searched. ### Ordinary characters -Normal characters include all printable and unprintable characters that -are not explicitly specified as metacharacters. This includes all uppercase +Normal characters include all printable and unprintable characters that are not explicitly specified as metacharacters. This includes all uppercase and lowercase letters, all numbers, all punctuation, and some other symbols. ### Special characters -A special character is a character with special meaning in a regular expression, -and is also the core matching syntax of a regular expression. See the table below: - -|Special characters|Description| -|:---:|:------------------------------------------------------| -|`$`| Matches the end position of the input string. | -|`(`,`)`| Marks the start and end of a subexpression. Subexpressions can be obtained for later use. | -|`*`| Matches the previous subexpression zero or more times. | -|`+`| Matches the previous subexpression one or more times. | -|`.`| Matches any single character except the newline character `\n`. | -|`[`| Marks the beginning of a bracket expression. | -|`?`| Matches the previous subexpression zero or one time, or indicates a non-greedy qualifier. | -| `\`| Marks the next character as either a special character, or a literal character, or a backward reference, or an octal escape character. For example, `n` Matches the character `n`. `\n` matches newline characters. The sequence `\\` Matches the `'\'` character, while `\(` matches the `'('` character.| -|`^`| Matches the beginning of the input string, unless it is used in a square bracket expression, at which point it indicates that the set of characters is not accepted. | -|`{`| Marks the beginning of a qualifier expression. | -|`\|`| Indicates a choice between the two. | +A special character is a character with special meaning in a regular expression and is also the core matching syntax of a regular expression. See the table below: + +| Special characters | Description | +| :----------------: | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | +| `$` | Matches the end position of the input string. | +| `(`,`)` | Marks the start and end of a subexpression. Subexpressions can be obtained for later use. | +| `*` | Matches the previous subexpression zero or more times. | +| `+` | Matches the previous subexpression one or more times. | +| `.` | Matches any single character except the newline character `\n`. | +| `[` | Marks the beginning of a bracket expression. | +| `?` | Matches the previous subexpression zero or one time, or indicates a non-greedy qualifier. | +| `\` | Marks the next character as either a special character, or a literal character, or a backward reference, or an octal escape character. For example, `n` Matches the character `n`. `\n` matches newline characters. The sequence `\\` Matches the `'\'` character, while `\(` matches the `'('` character. | +| `^` | Matches the beginning of the input string, unless it is used in a square bracket expression, at which point it indicates that the set of characters is not accepted. | +| `{` | Marks the beginning of a qualifier expression. | +| `\|` | Indicates a choice between the two. | ### Quantifiers The qualifier is used to specify how many times a given component of a regular expression must appear to satisfy the match. See the table below: -|Character|Description| -|:---:|:------------------------------------------------------| -|`*`| matches the previous subexpression zero or more times. For example, `foo*` matches `fo` and `foooo`. `*` is equivalent to `{0,}`. | -|`+`| matches the previous subexpression one or more times. For example, `foo+` matches `foo` and `foooo` but does not match `fo`. `+` is equivalent to `{1,}`. | -|`?`| matches the previous subexpression zero or one time. For example, `Your(s)?` can match `Your` in `Your` or `Yours`. `?` is equivalent to `{0,1}`. | -|`{n}`| `n` is a non-negative integer. Matches the determined `n` times. For example, `o{2}` cannot match `o` in `for`, but can match two `o` in `foo`. | -|`{n,}`| `n` is a non-negative integer. Match at least `n` times. For example, `o{2,}` cannot match `o` in `for`, but matches all `o` in `foooooo`. `o{1,}` is equivalent to `o+`. `o{0,}` is equivalent to `o*`. | -|`{n,m}`| `m` and `n` are non-negative integers, where `n` is less than or equal to `m`. Matches at least `n` times and matches up to `m` times. For example, `o{1,3}` will match the first three `o` in `foooooo`. `o{0,1}` is equivalent to `o?`. Note that there can be no spaces between the comma and the two numbers. | +| Character | Description | +| :-------: | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | +| `*` | matches the previous subexpression zero or more times. For example, `foo*` matches `fo` and `foooo`. `*` is equivalent to `{0,}`. | +| `+` | matches the previous subexpression one or more times. For example, `foo+` matches `foo` and `foooo` but does not match `fo`. `+` is equivalent to `{1,}`. | +| `?` | matches the previous subexpression zero or one time. For example, `Your(s)?` can match `Your` in `Your` or `Yours`. `?` is equivalent to `{0,1}`. | +| `{n}` | `n` is a non-negative integer. Matches the determined `n` times. For example, `o{2}` cannot match `o` in `for`, but can match two `o` in `foo`. | +| `{n,}` | `n` is a non-negative integer. Match at least `n` times. For example, `o{2,}` cannot match `o` in `for`, but matches all `o` in `foooooo`. `o{1,}` is equivalent to `o+`. `o{0,}` is equivalent to `o*`. | +| `{n,m}` | `m` and `n` are non-negative integers, where `n` is less than or equal to `m`. Matches at least `n` times and matches up to `m` times. For example, `o{1,3}` will match the first three `o` in `foooooo`. `o{0,1}` is equivalent to `o?`. Note that there can be no spaces between the comma and the two numbers. | With these two tables, we can usually read almost all regular expressions. ## 6.2 `std::regex` and Its Related -The most common way to match string content is to use regular expressions. Unfortunately, in traditional C++, regular expressions have not been supported by the language level, and are not included in the standard library. C++ is a high-performance language. In the development of background services, the use of regular expressions is also used when judging URL resource links. The most mature and common practice in industry. +The most common way to match string content is to use regular expressions. Unfortunately, in traditional C++, regular expressions have not been supported by the language level, and are not included in the standard library. C++ is a high-performance language. In the development of background services, the use of regular expressions is also used when judging URL resource links. The most mature and common practice in the industry. The general solution is to use the regular expression library of `boost`. C++11 officially incorporates the processing of regular expressions into the standard library, providing standard support from the language level and no longer relying on third parties. @@ -77,7 +75,7 @@ We use a simple example to briefly introduce the use of this library. Consider t - `[az]+\.txt`: In this regular expression, `[az]` means matching a lowercase letter, `+` can match the previous expression multiple times, so `[az]+` can Matches a string of lowercase letters. In the regular expression, a `.` means to match any character, and `\.` means to match the character `.`, and the last `txt` means to match `txt` exactly three letters. So the content of this regular expression to match is a text file consisting of pure lowercase letters. -`std::regex_match` is used to match strings and regular expressions, and there are many different overloaded forms. The simplest form is to pass `std::string` and a `std::regex` to match. When the match is successful, it will return `true`, otherwise it will return `false`. For example: +`std::regex_match` is used to match strings and regular expressions, and there are many different overloaded forms. The simplest form is to pass `std::string` and a `std::regex` to match. When the match is successful, it will return `true`, otherwise, it will return `false`. For example: ```cpp #include @@ -131,14 +129,14 @@ bar.txt sub-match[1]: bar ## Conclusion -This section briefly introduces the regular expression itself, -and then introduces the use of the regular expression library -through a practical example based on the main requirements of +This section briefly introduces the regular expression itself, +and then introduces the use of the regular expression library +through a practical example based on the main requirements of using regular expressions. ## Exercise -In web server development, we usually want to serve some routes that satisfy a certain condition. +In web server development, we usually want to serve some routes that satisfy a certain condition. Regular expressions are one of the tools to accomplish this. Given the following request structure: @@ -230,4 +228,4 @@ An suggested solution can be found [here](../../exercises/6). ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 9c907495..412e7905 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -28,7 +28,7 @@ int main() { ## 7.2 Mutex and Critical Section -We have already learned the basics of concurrency technology in the operating system, or in the database, and `mutex` is one of the cores. +We have already learned the basics of concurrency technology in the operating system, or the database, and `mutex` is one of the cores. C++11 introduces a class related to `mutex`, with all related functions in the `` header file. `std::mutex` is the most basic `mutex` class in C++11, and you can create a mutex by instantiating `std::mutex`. @@ -114,10 +114,10 @@ int main() { ## 7.3 Future The Future is represented by `std::future`, which provides a way to access the results of asynchronous operations. This sentence is very difficult to understand. -In order to understand this feature, we need to understand the multi-threaded behavior before C++11. +To understand this feature, we need to understand the multi-threaded behavior before C++11. Imagine if our main thread A wants to open a new thread B to perform some of our expected tasks and return me a result. -At this time, thread A may be busy with other things, and have no time to take into account the results of B. +At this time, thread A may be busy with other things and have no time to take into account the results of B. So we naturally hope to get the result of thread B at a certain time. Before the introduction of `std::future` in C++11, the usual practice is: @@ -217,15 +217,15 @@ int main() { } ``` -It is worth mentioning that although we can use `notify_one()` in the producer, it is not really recommended to use it here. -Because in the case of multiple consumers, our consumer implementation simply gives up the lock holding, which makes it possible for other consumers to compete for this lock, so as to better utilize the concurrency between multiple consumers. Having said that, but in fact because of the exclusivity of `std::mutex`, -We simply can't expect multiple consumers to be able to actually produce content in a parallel consumer queue, and we still need a more granular approach. +It is worth mentioning that although we can use `notify_one()` in the producer, it is not recommended to use it here. +Because in the case of multiple consumers, our consumer implementation simply gives up the lock holding, which makes it possible for other consumers to compete for this lock, to better utilize the concurrency between multiple consumers. Having said that, but in fact because of the exclusivity of `std::mutex`, +We simply can't expect multiple consumers to be able to produce content in a parallel consumer queue, and we still need a more granular approach. ## 7.5 Atomic Operation and Memory Model -Careful readers may be tempted by the fact that the example of the producer consumer model in the previous section may have compiler optimizations that cause program errors. +Careful readers may be tempted by the fact that the example of the producer-consumer model in the previous section may have compiler optimizations that cause program errors. For example, the boolean `notified` is not modified by `volatile`, and the compiler may have optimizations for this variable, such as the value of a register. -As a result, the consumer thread can never observe the change of this value. This is a good question. To explain this problem, we need to further discuss the concept of memory model introduced from C++11. Let's first look at a question. What is the output of the following code? +As a result, the consumer thread can never observe the change of this value. This is a good question. To explain this problem, we need to further discuss the concept of the memory model introduced from C++11. Let's first look at a question. What is the output of the following code? ```cpp #include @@ -254,19 +254,19 @@ int main() { ``` Intuitively, `a = 5;` seems in `t2` seems to always execute before `flag = 1;`, and `while (flag != 1)` in `t1` seems to guarantee `std ::cout << "b = " << b << std::endl;` will not be executed before the mark is changed. Logically, it seems that the value of `b` should be equal to 5. -But the actual situation is much more complicated than this, or the code itself is undefined behavior, because for `a` and `flag`, they are read and written in two parallel threads. -There has been competition. In addition, even if we ignore competing reading and writing, it is still possible to receive out-of-order execution of the CPU, and the impact of the compiler on the rearrangement of instructions. +But the actual situation is much more complicated than this, or the code itself is undefined behavior because, for `a` and `flag`, they are read and written in two parallel threads. +There has been competition. Also, even if we ignore competing for reading and writing, it is still possible to receive out-of-order execution of the CPU and the impact of the compiler on the rearrangement of instructions. Cause `a = 5` to occur after `flag = 1`. Thus `b` may output 0. ### Atomic Operation -`std::mutex` can solve the problem of concurrent read and write, but the mutex is an operating system level function. +`std::mutex` can solve the problem of concurrent read and write, but the mutex is an operating system-level function. This is because the implementation of a mutex usually contains two basic principles: 1. Provide automatic state transition between threads, that is, "lock" state 2. Ensure that the memory of the manipulated variable is isolated from the critical section during the mutex operation -This is a very strong set of synchronization conditions, in other words, when it is finally compiled into a CPU instruction, it will behave as a lot of instructions (we will look at how to implement a simple mutex later). +This is a very strong set of synchronization conditions, in other words when it is finally compiled into a CPU instruction, it will behave like a lot of instructions (we will look at how to implement a simple mutex later). This seems too harsh for a variable that requires only atomic operations (no intermediate state). The research on synchronization conditions has a very long history, and we will not go into details here. Readers should understand that under the modern CPU architecture, atomic operations at the CPU instruction level are provided. @@ -335,207 +335,205 @@ Weakening the synchronization conditions between processes, usually we will cons 1. Linear consistency: Also known as strong consistency or atomic consistency. It requires that any read operation can read the most recent write of a certain data, and the order of operation of all threads is consistent with the order under the global clock. - ``` - x.store(1) x.load() - T1 ---------+----------------+------> + ``` + x.store(1) x.load() + T1 ---------+----------------+------> - T2 -------------------+-------------> - x.store(2) - ``` + T2 -------------------+-------------> + x.store(2) + ``` - In this case, thread `T1`, `T2` is twice atomic to `x`, and `x.store(1)` is strictly before `x.store(2)`. `x.store(2)` strictly occurs before `x.load()`. It is worth mentioning that linear consistency requirements for global clocks are difficult to achieve, which is why people continue to study other consistent algorithms under this weaker consistency. + In this case, thread `T1`, `T2` is twice atomic to `x`, and `x.store(1)` is strictly before `x.store(2)`. `x.store(2)` strictly occurs before `x.load()`. It is worth mentioning that linear consistency requirements for global clocks are difficult to achieve, which is why people continue to study other consistent algorithms under this weaker consistency. 2. Sequential consistency: It is also required that any read operation can read the last data written by the data, but it is not required to be consistent with the order of the global clock. - ``` - x.store(1) x.store(3) x.load() - T1 ---------+-----------+----------+-----> + ``` + x.store(1) x.store(3) x.load() + T1 ---------+-----------+----------+-----> - T2 ---------------+----------------------> - x.store(2) + T2 ---------------+----------------------> + x.store(2) - or + or - x.store(1) x.store(3) x.load() - T1 ---------+-----------+----------+-----> + x.store(1) x.store(3) x.load() + T1 ---------+-----------+----------+-----> - T2 ------+-------------------------------> - x.store(2) - ``` + T2 ------+-------------------------------> + x.store(2) + ``` - Under the order consistency requirement, `x.load()` must read the last written data, so `x.store(2)` and `x.store(1)` do not have any guarantees, ie As long as `x.store(2)` of `T2` occurs before `x.store(3)`. + Under the order consistency requirement, `x.load()` must read the last written data, so `x.store(2)` and `x.store(1)` do not have any guarantees, ie As long as `x.store(2)` of `T2` occurs before `x.store(3)`. 3. Causal consistency: its requirements are further reduced, only the sequence of causal operations is guaranteed, and the order of non-causal operations is not required. - ``` - a = 1 b = 2 - T1 ----+-----------+----------------------------> + ``` + a = 1 b = 2 + T1 ----+-----------+----------------------------> - T2 ------+--------------------+--------+--------> - x.store(3) c = a + b y.load() + T2 ------+--------------------+--------+--------> + x.store(3) c = a + b y.load() - or + or - a = 1 b = 2 - T1 ----+-----------+----------------------------> + a = 1 b = 2 + T1 ----+-----------+----------------------------> - T2 ------+--------------------+--------+--------> - x.store(3) y.load() c = a + b + T2 ------+--------------------+--------+--------> + x.store(3) y.load() c = a + b - or + or - b = 2 a = 1 - T1 ----+-----------+----------------------------> + b = 2 a = 1 + T1 ----+-----------+----------------------------> - T2 ------+--------------------+--------+--------> - y.load() c = a + b x.store(3) - ``` + T2 ------+--------------------+--------+--------> + y.load() c = a + b x.store(3) + ``` - The three examples given above are all causal consistent, because in the whole process, only `c` has a dependency on `a` and `b`, and `x` and `y` are not related in this example. (But in actual situations we need more detailed information to determine that `x` is not related to `y`) + The three examples given above are all causal consistent because, in the whole process, only `c` has a dependency on `a` and `b`, and `x` and `y` are not related in this example. (But in actual situations we need more detailed information to determine that `x` is not related to `y`) -4. Final Consistency: It is the weakest consistency requirement. It only guarantees that an operation will be observed at a certain point in the future, but does not require the observed time. So we can even strengthen this condition a bit, for example, to specify that the time observed for an operation is always bounded. Of course this is no longer within our discussion. +4. Final Consistency: It is the weakest consistency requirement. It only guarantees that an operation will be observed at a certain point in the future, but does not require the observed time. So we can even strengthen this condition a bit, for example, to specify that the time observed for an operation is always bounded. Of course, this is no longer within our discussion. - ``` - x.store(3) x.store(4) - T1 ----+-----------+--------------------------------------------> + ``` + x.store(3) x.store(4) + T1 ----+-----------+--------------------------------------------> - T2 ---------+------------+--------------------+--------+--------> - x.read() x.read() x.read() x.read() - ``` + T2 ---------+------------+--------------------+--------+--------> + x.read() x.read() x.read() x.read() + ``` - In the above case, if we assume that the initial value of x is 0, then the four times ``x.read()` in `T2` may be but not limited to the following: + In the above case, if we assume that the initial value of x is 0, then the four times ``x.read()` in `T2` may be but not limited to the following: - ``` - 3 4 4 4 // The write operation of x was quickly observed - 0 3 3 4 // There is a delay in the observed time of the x write operation - 0 0 0 4 // The last read read the final value of x, but the previous changes were not observed. - 0 0 0 0 // The write operation of x is not observed in the current time period, but the situation that x is 4 can be observed at some point in the future. - ``` + ``` + 3 4 4 4 // The write operation of x was quickly observed + 0 3 3 4 // There is a delay in the observed time of the x write operation + 0 0 0 4 // The last read read the final value of x, but the previous changes were not observed. + 0 0 0 0 // The write operation of x is not observed in the current time period, but the situation that x is 4 can be observed at some point in the future. + ``` ### Memory Orders -In order to achieve the ultimate performance and achieve consistency of various strength requirements, C++11 defines six different memory sequences for atomic operations. The option `std::memory_order` expresses four synchronization models between multiple threads: +To achieve the ultimate performance and achieve consistency of various strength requirements, C++11 defines six different memory sequences for atomic operations. The option `std::memory_order` expresses four synchronization models between multiple threads: 1. Relaxed model: Under this model, atomic operations within a single thread are executed sequentially, and instruction reordering is not allowed, but the order of atomic operations between different threads is arbitrary. The type is specified by `std::memory_order_relaxed`. Let's look at an example: - ```cpp - std::atomic counter = {0}; - std::vector vt; - for (int i = 0; i < 100; ++i) { - vt.emplace_back([&](){ - counter.fetch_add(1, std::memory_order_relaxed); - }); - } - - for (auto& t : vt) { - t.join(); - } - std::cout << "current counter:" << counter << std::endl; - ``` - + ```cpp + std::atomic counter = {0}; + std::vector vt; + for (int i = 0; i < 100; ++i) { + vt.emplace_back([&](){ + counter.fetch_add(1, std::memory_order_relaxed); + }); + } + + for (auto& t : vt) { + t.join(); + } + std::cout << "current counter:" << counter << std::endl; + ``` 2. Release/consumption model: In this model, we begin to limit the order of operations between processes. If a thread needs to modify a value, but another thread will have a dependency on that operation of the value, that is, the latter depends. former. Specifically, thread A has completed three writes to `x`, and thread `B` relies only on the third `x` write operation, regardless of the first two write behaviors of `x`, then `A ` When active `x.release()` (ie using `std::memory_order_release`), the option `std::memory_order_consume` ensures that `B` observes `A` when calling `x.load()` Three writes to `x`. Let's look at an example: - ```cpp - // initialize as nullptr to prevent consumer load a dangling pointer - std::atomic ptr(nullptr); - int v; - std::thread producer([&]() { - int* p = new int(42); - v = 1024; - ptr.store(p, std::memory_order_release); - }); - std::thread consumer([&]() { - int* p; - while(!(p = ptr.load(std::memory_order_consume))); - - std::cout << "p: " << *p << std::endl; - std::cout << "v: " << v << std::endl; - }); - producer.join(); - consumer.join(); - ``` - -3. Release/Acquire model: Under this model, we can further tighten the order of atomic operations between different threads, specifying the timing between releasing `std::memory_order_release` and getting `std::memory_order_acquire`. **All** write operations before the release operation are visible to any other thread, ie, happens-before. - - As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a forward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a backward barrier. For the `std::memory_order_acq_rel` option, it combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation. - - Let's check an example: - - ```cpp - std::vector v; - std::atomic flag = {0}; - std::thread release([&]() { - v.push_back(42); - flag.store(1, std::memory_order_release); - }); - std::thread acqrel([&]() { - int expected = 1; // must before compare_exchange_strong - while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) { - expected = 1; // must after compare_exchange_strong - } - // flag has changed to 2 - }); - std::thread acquire([&]() { - while(flag.load(std::memory_order_acquire) < 2); - - std::cout << v.at(0) << std::endl; // must be 42 - }); - release.join(); - acqrel.join(); - acquire.join(); - ``` - - In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically, when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`, but in most cases, `compare_exchange_strong` should be limited. - -4. Sequential Consistent Model: Under this model, atomic operations satisfy sequence consistency, which in turn can cause performance loss. It can be specified explicitly by `std::memory_order_seq_cst`. Let's look a final example: - - ```cpp - std::atomic counter = {0}; - std::vector vt; - for (int i = 0; i < 100; ++i) { - vt.emplace_back([&](){ - counter.fetch_add(1, std::memory_order_seq_cst); - }); - } - - for (auto& t : vt) { - t.join(); - } - std::cout << "current counter:" << counter << std::endl; - ``` - - This example is essentially the same as the first loose model example. Just change the memory order of the atomic operation to `memory_order_seq_cst`. Interested readers can write their own programs to measure the performance difference caused by these two different memory sequences. - + ```cpp + // initialize as nullptr to prevent consumer load a dangling pointer + std::atomic ptr(nullptr); + int v; + std::thread producer([&]() { + int* p = new int(42); + v = 1024; + ptr.store(p, std::memory_order_release); + }); + std::thread consumer([&]() { + int* p; + while(!(p = ptr.load(std::memory_order_consume))); + + std::cout << "p: " << *p << std::endl; + std::cout << "v: " << v << std::endl; + }); + producer.join(); + consumer.join(); + ``` + +3. Release/Acquire model: Under this model, we can further tighten the order of atomic operations between different threads, specifying the timing between releasing `std::memory_order_release` and getting `std::memory_order_acquire`. **All** write operations before the release operation is visible to any other thread, i.e., happens before. + + As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a forward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a backward barrier. For the `std::memory_order_acq_rel` option, combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation. + + Let's check an example: + + ```cpp + std::vector v; + std::atomic flag = {0}; + std::thread release([&]() { + v.push_back(42); + flag.store(1, std::memory_order_release); + }); + std::thread acqrel([&]() { + int expected = 1; // must before compare_exchange_strong + while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) { + expected = 1; // must after compare_exchange_strong + } + // flag has changed to 2 + }); + std::thread acquire([&]() { + while(flag.load(std::memory_order_acquire) < 2); + + std::cout << v.at(0) << std::endl; // must be 42 + }); + release.join(); + acqrel.join(); + acquire.join(); + ``` + + In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`, but in most cases, `compare_exchange_strong` should be limited. + +4. Sequential Consistent Model: Under this model, atomic operations satisfy sequence consistency, which in turn can cause performance loss. It can be specified explicitly by `std::memory_order_seq_cst`. Let's look at a final example: + + ```cpp + std::atomic counter = {0}; + std::vector vt; + for (int i = 0; i < 100; ++i) { + vt.emplace_back([&](){ + counter.fetch_add(1, std::memory_order_seq_cst); + }); + } + + for (auto& t : vt) { + t.join(); + } + std::cout << "current counter:" << counter << std::endl; + ``` + + This example is essentially the same as the first loose model example. Just change the memory order of the atomic operation to `memory_order_seq_cst`. Interested readers can write their own programs to measure the performance difference caused by these two different memory sequences. ## Conclusion The C++11 language layer provides support for concurrent programming. This section briefly introduces `std::thread`/`std::mutex`/`std::future`, an important tool that can't be avoided in concurrent programming. In addition, we also introduced the "memory model" as one of the most important features of C++11. -They provide an critical foundation for standardized high performance computing for C++. +They provide a critical foundation for standardized high-performance computing for C++. ## Exercises 1. Write a simple thread pool that provides the following features: - ```cpp - ThreadPool p(4); // specify four work thread + ```cpp + ThreadPool p(4); // specify four work thread - // enqueue a task, and return a std::future - auto f = pool.enqueue([](int life) { - return meaning; - }, 42); + // enqueue a task, and return a std::future + auto f = pool.enqueue([](int life) { + return meaning; + }, 42); - // fetch result from future - std::cout << f.get() << std::endl; - ``` + // fetch result from future + std::cout << f.get() << std::endl; + ``` 2. Use `std::atomic` to implement a mutex. diff --git a/book/en-us/09-others.md b/book/en-us/09-others.md index f4d3342a..9db078ef 100644 --- a/book/en-us/09-others.md +++ b/book/en-us/09-others.md @@ -12,22 +12,20 @@ order: 9 ### `long long int` -`long long int` is not the first to be introduced in C++11. -In fact, as early as C99, `long long int` has been included in the C standard, -so most compilers already support it. -C++11 now formally incorporate it into the standard library, +`long long int` is not the first to be introduced in C++11. +As early as C99, `long long int` has been included in the C standard, +so most compilers already support it. +C++11 now formally incorporate it into the standard library, specifying a `long long int` type with at least 64 bits. ## 9.2 `noexcept` and Its Operations -One of the big advantages of C++ over C is that -C++ itself defines a complete set of exception handling mechanisms. -However, before C++11, almost no one used to write -an exception declaration expression after the function name. -Starting from C++11, this mechanism was deprecated, -so we will not discuss or introduce the previous mechanism. -How to work and how to use it, you should not take the initiative -to understand it. +One of the big advantages of C++ over C is that +C++ itself defines a complete set of exception handling mechanisms. +However, before C++11, almost no one used to write an exception declaration expression after the function name. +Starting from C++11, this mechanism was deprecated, +so we will not discuss or introduce the previous mechanism. +How to work and how to use it, you should not take the initiative to understand it. C++11 simplifies exception declarations into two cases: @@ -41,13 +39,13 @@ void may_throw(); // May throw any exception void no_throw() noexcept; // Cannot throw any exception ``` -If a function modified with `noexcept` is thrown, -the compiler will use `std::terminate()` to +If a function modified with `noexcept` is thrown, +the compiler will use `std::terminate()` to immediately terminate the program. -`noexcept` can also be used as an operator to manipulate an expression. -When the expression has no exception, it returns `true`, -otherwise it returns `false`. +`noexcept` can also be used as an operator to manipulate an expression. +When the expression has no exception, it returns `true`, +otherwise, it returns `false`. ```cpp #include @@ -75,8 +73,8 @@ int main() } ``` -`noexcept` can modify the function of blocking exceptions -after modifying a function. If an exception is generated internally, +`noexcept` can modify the function of blocking exceptions +after modifying a function. If an exception is generated internally, the external will not trigger. For instance: ```cpp @@ -108,13 +106,13 @@ exception captured, from non_block_throw() ### Raw String Literal -In traditional C++, it is very painful to write a string full of -special characters. For example, a string containing HTML ontology -needs to add a large number of escape characters. +In traditional C++, it is very painful to write a string full of +special characters. For example, a string containing HTML ontology +needs to add a large number of escape characters. For example, a file path on Windows often as: `C:\\Path\\To\\File`. -C++11 provides the original string literals, -which can be decorated with `R` in front of a string, +C++11 provides the original string literals, +which can be decorated with `R` in front of a string, and the original string is wrapped in parentheses, for example: ```cpp @@ -130,7 +128,7 @@ int main() { ### Custom Literal -C++11 introduces the ability to customize literals by +C++11 introduces the ability to customize literals by overloading the double quotes suffix operator: ```cpp @@ -190,19 +188,19 @@ int main() { } ``` -where `std::max_align_t` requires exactly the same alignment for each scalar type, so it has almost no difference in maximum scalars. +where `std::max_align_t` requires the same alignment for each scalar type, so it has almost no difference in maximum scalars. In turn, the result on most platforms is `long double`, so the alignment requirement for `AlignasStorage` we get here is 8 or 16. ## Conclusion -Several of the features introduced in this section are those that -use more frequent features from modern C++ features that -have not yet been introduced. `noexcept` is the most important feature. -One of its features is to prevent the spread of anomalies, +Several of the features introduced in this section are those that +use more frequent features from modern C++ features that +have not yet been introduced. `noexcept` is the most important feature. +One of its features is to prevent the spread of anomalies, effective Let the compiler optimize our code to the maximum extent possible. [Table of Content](./toc.md) | [Previous Chapter](./08-filesystem.md) | [Next Chapter: Outlook: Introduction of C++20](./10-cpp20.md) ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/10-cpp20.md b/book/en-us/10-cpp20.md index c1bb241e..8988edf3 100644 --- a/book/en-us/10-cpp20.md +++ b/book/en-us/10-cpp20.md @@ -9,22 +9,22 @@ order: 10 [TOC] C++20 seems to be an exciting update. -For example, as early as C++11, the `Concept`, +For example, as early as C++11, the `Concept`, which was eager to call for high-altitude but ultimately lost, is now on the line. -The C++ Organizing Committee decided to vote to finalize C++20 with many proposals, +The C++ Organizing Committee decided to vote to finalize C++20 with many proposals, such as **Concepts**/**Module**/**Coroutine**/**Ranges**/ and so on. -In this chapter we'll take a look at some of the important features that +In this chapter, we'll take a look at some of the important features that C++20 will introduce. ## Concept -Concept is a further enhancement to C++ template programming. +The concept is a further enhancement to C++ template programming. In simple terms, the concept is a compile-time feature. -It allows the compiler to evaluate template parameters at compile time, +It allows the compiler to evaluate template parameters at compile-time, greatly enhancing our experience with template programming in C++. When programming with templates, we often encounter a variety of heinous errors. This is because we have so far been unable to check and limit template parameters. -For example, the following two lines of code can cause a lot of +For example, the following two lines of code can cause a lot of almost unreadable compilation errors: ```cpp @@ -37,12 +37,12 @@ int main() { } ``` -The root cause of this code error is that `std::sort` must provide -a random iterator for the sorting container, otherwise it will not be used, +The root cause of this code error is that `std::sort` must provide +a random iterator for the sorting container, otherwise it will not be used, and we know that `std::list` does not support random access. -In the conceptual language, the iterator in `std::list` does not satisfy +In the conceptual language, the iterator in `std::list` does not satisfy the constraint of the concept of random iterators in `std::sort`. -After introducing the concept, we can constrain the template parameters +After introducing the concept, we can constrain the template parameters like this: ```cpp @@ -99,4 +99,4 @@ This is still full of charm for a programming language that is already in its th ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). From 645fa6267775cb40de57aedb72adfb8377b53928 Mon Sep 17 00:00:00 2001 From: Timothy Date: Fri, 30 Apr 2021 22:00:19 +0800 Subject: [PATCH 15/77] book: format fixes (#187) --- book/zh-cn/00-preface.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/00-preface.md b/book/zh-cn/00-preface.md index b9273e70..a60a0ef6 100644 --- a/book/zh-cn/00-preface.md +++ b/book/zh-cn/00-preface.md @@ -15,7 +15,7 @@ C++ 是一个用户群体相当大的语言。从 C++98 的出现到 C++11 的 **现代 C++** (本书中均指 C++11/14/17/20) 为传统 C++ 注入的大量特性使得整个 C++ 变得更加像一门现代化的语言。现代 C++ 不仅仅增强了 C++ 语言自身的可用性，`auto` 关键字语义的修改使得我们更加有信心来操控极度复杂的模板类型。同时还对语言运行期进行了大量的强化，Lambda 表达式的出现让 C++ 具有了『匿名函数』的『闭包』特性，而这一特性几乎在现代的编程语言（诸如 Python/Swift/... ）中已经司空见惯，右值引用的出现解决了 C++ 长期以来被人诟病的临时对象效率问题等等。 -C++17 则是近三年依赖 C++ 社区一致推进的方向，也指出了**现代C++**编程的一个重要发展方向。尽管它的出现并不如 C++11 的分量之重，但它包含了大量小而美的语言与特性（例如结构化绑定），这些特性的出现再一次修正了我们在 C++ 中的编程范式。 +C++17 则是近三年依赖 C++ 社区一致推进的方向，也指出了 **现代C++** 编程的一个重要发展方向。尽管它的出现并不如 C++11 的分量之重，但它包含了大量小而美的语言与特性（例如结构化绑定），这些特性的出现再一次修正了我们在 C++ 中的编程范式。 现代 C++ 还为自身的标准库增加了非常多的工具和方法，诸如在语言自身标准的层面上制定了 `std::thread`，从而支持了并发编程，在不同平台上不再依赖于系统底层的 API，实现了语言层面的跨平台支持；`std::regex` 提供了完整的正则表达式支持等等。C++98 已经被实践证明了是一种非常成功的『范型』，而现代 C++ 的出现，则进一步推动这种范型，让 C++ 成为系统程序设计和库开发更好的语言。Concept 提供了对模板参数编译期的检查，进一步增强了语言整体的可用性。 From 711694e0a21cea22234e569e91f4be164c070a82 Mon Sep 17 00:00:00 2001 From: Guo Date: Thu, 10 Jun 2021 20:43:51 +0800 Subject: [PATCH 16/77] book: typo fix (#189) --- book/zh-cn/07-thread.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index f5c67cb5..1e81fd08 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -33,7 +33,7 @@ C++11 引入了 `mutex` 相关的类，其所有相关的函数都放在 ` Date: Sun, 13 Jun 2021 22:38:29 +0800 Subject: [PATCH 17/77] book: typo fix (#190) --- book/zh-cn/05-pointers.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index a0830275..010af297 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -27,7 +27,7 @@ order: 5 ## 5.2 `std::shared_ptr` -`std::shared_ptr` 是一种智能指针，它能够记录多少个 `shared_ptr` 共同指向一个对象，从而消除显示的调用 +`std::shared_ptr` 是一种智能指针，它能够记录多少个 `shared_ptr` 共同指向一个对象，从而消除显式的调用 `delete`，当引用计数变为零的时候就会将对象自动删除。 但还不够，因为使用 `std::shared_ptr` 仍然需要使用 `new` 来调用，这使得代码出现了某种程度上的不对称。 From 7f7d7086a941b425331eacc1673d9d09dcdd7448 Mon Sep 17 00:00:00 2001 From: QuarticCat Date: Wed, 7 Jul 2021 14:25:57 +0800 Subject: [PATCH 18/77] book: remove default template parameters (#194) --- book/en-us/02-usability.md | 22 ---------------------- book/zh-cn/02-usability.md | 29 ----------------------------- 2 files changed, 51 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 66ff6a46..92f041fc 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -709,28 +709,6 @@ int main() { } ``` -### Default template parameters - -We may have defined an addition function: - -```cpp -template -auto add(T x, U y) -> decltype(x+y) { - return x+y; -} -``` - -However, when used, it is found that to use add, you must specify the type of its template parameters each time. - -A convenience is provided in C++11 to specify the default parameters of the template: - -```cpp -template -auto add(T x, U y) -> decltype(x+y) { - return x+y; -} -``` - ### Variadic templates The template has always been one of C++'s unique **Black Magic**. diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index abafda19..7e1fe026 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -619,35 +619,6 @@ int main() { } ``` -### 默认模板参数 - -我们可能定义了一个加法函数： - -```cpp -// c++11 version -template -auto add(T x, U y) -> decltype(x+y) { - return x+y; -} - -// Call add function -auto ret = add(1,3); -``` - -但在使用时发现，要使用 `add`，就必须每次都指定其模板参数的类型。 - -在 C++11 中提供了一种便利，可以指定模板的默认参数： - -```cpp -template -auto add(T x, U y) -> decltype(x+y) { - return x+y; -} - -// Call add function -auto ret = add(1,3); -``` - ### 变长参数模板 模板一直是 C++ 所独有的**黑魔法**（一起念：**Dark Magic**）之一。 From 068840bb72328127d318d5d92cbf4c906366ecc8 Mon Sep 17 00:00:00 2001 From: Jiannanya <80886842+jiannanya@users.noreply.github.com> Date: Sat, 31 Jul 2021 17:35:21 +0800 Subject: [PATCH 19/77] book: typo fixes (#200) --- book/zh-cn/09-others.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/book/zh-cn/09-others.md b/book/zh-cn/09-others.md index 0e33789e..fe9d7c59 100644 --- a/book/zh-cn/09-others.md +++ b/book/zh-cn/09-others.md @@ -72,7 +72,7 @@ int main() try { may_throw(); } catch (...) { - std::cout << "捕获异常, 来自 my_throw()" << std::endl; + std::cout << "捕获异常, 来自 may_throw()" << std::endl; } try { non_block_throw(); @@ -89,7 +89,7 @@ try { 最终输出为： ``` -捕获异常, 来自 my_throw() +捕获异常, 来自 may_throw() 捕获异常, 来自 non_block_throw() ``` @@ -189,4 +189,4 @@ int main() { 知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 From 7eeaa7ae4e3d1569e0fd38add199544794d1e132 Mon Sep 17 00:00:00 2001 From: weissle <2016301500298@whu.edu.cn> Date: Sat, 7 Aug 2021 00:58:34 +0800 Subject: [PATCH 20/77] book: typo fix (#202) --- book/zh-cn/03-runtime.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 87612c17..2b8a76f5 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -544,7 +544,7 @@ constexpr _Tp&& forward(typename std::remove_reference<_Tp>::type&& __t) noexcep 而 `std::is_lvalue_reference` 用于检查类型推导是否正确，在 `std::forward` 的第二个实现中 检查了接收到的值确实是一个左值，进而体现了坍缩规则。 -当 `std::forward` 接受左值时，`_Tp` 被推导为左值，而所以返回值为左值；而当其接受右值时， +当 `std::forward` 接受左值时，`_Tp` 被推导为左值，所以返回值为左值；而当其接受右值时， `_Tp` 被推导为 右值引用，则基于坍缩规则，返回值便成为了 `&& + &&` 的右值。 可见 `std::forward` 的原理在于巧妙的利用了模板类型推导中产生的差异。 From d472ff142172450e6ef9dd0b1575624d4d0da076 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 11:20:57 +0200 Subject: [PATCH 21/77] book: add text about auto as func args Fixes #180 --- book/en-us/02-usability.md | 27 ++++++++++++++------------- book/zh-cn/02-usability.md | 28 ++++++++++++++++------------ code/2/2.06.auto.cpp | 18 +++++++++--------- 3 files changed, 39 insertions(+), 34 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 92f041fc..935fce6f 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -411,19 +411,20 @@ auto i = 5; // i as int auto arr = new auto(10); // arr as int * ``` -> **Note**: `auto` cannot be used for function arguments, so the following -> is not possible to compile (considering overloading, -> we should use templates): -> -> ```cpp -> int add(auto x, auto y); -> -> 2.6.auto.cpp:16:9: error: 'auto' not allowed in function prototype -> int add(auto x, auto y) { -> ^~~~ -> ``` -> -> In addition, `auto` cannot be used to derive array types: +Since C++ 20, `auto` can even be used as function arguments. Consider +the following example: + +```cpp +int add(auto x, auto y) { + return x+y; +} + +auto i = 5; // type int +auto j = 6; // type int +std::cout << add(i, j) << std::endl; +``` + +> **Note**: `auto` cannot be used to derive array types yet: > > ```cpp > auto auto_arr2[10] = {arr}; // illegal, can't infer array type diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 7e1fe026..489eea5b 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -348,20 +348,24 @@ auto i = 5; // i 被推导为 int auto arr = new auto(10); // arr 被推导为 int * ``` -> **注意**：`auto` 不能用于函数传参，因此下面的做法是无法通过编译的（考虑重载的问题，我们应该使用模板）： -> -> ```cpp -> int add(auto x, auto y); -> -> 2.6.auto.cpp:16:9: error: 'auto' not allowed in function prototype -> int add(auto x, auto y) { -> ^~~~ -> ``` +从 C++ 20 起，`auto` 甚至能用于函数传参，考虑下面的例子： + + +```cpp +int add(auto x, auto y) { + return x+y; +} + +auto i = 5; // 被推导为 int +auto j = 6; // 被推导为 int +std::cout << add(i, j) << std::endl; +``` + > -> 此外，`auto` 还不能用于推导数组类型： +> **注意**：`auto` 还不能用于推导数组类型： > > ```cpp -> auto auto_arr2[10] = {arr}; // 错误, 无法推导数组元素类型 +> auto auto_arr2[10] = {arr}; // 错误, 无法推导数组元素类型 > > 2.6.auto.cpp:30:19: error: 'auto_arr2' declared as array of 'auto' > auto auto_arr2[10] = {arr}; @@ -415,7 +419,7 @@ R add(T x, U y) { > 注意：typename 和 class 在模板参数列表中没有区别，在 typename 这个关键字出现之前，都是使用 class 来定义模板参数的。但在模板中定义有[嵌套依赖类型](http://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names)的变量时，需要用 typename 消除歧义 -这样的代码其实变得很丑陋，因为程序员在使用这个模板函数的时候，必须明确指出返回类型。但事实上我们并不知道 `add()` 这个函数会做什么样的操作，获得一个什么样的返回类型。 +这样的代码其实变得很丑陋，因为程序员在使用这个模板函数的时候，必须明确指出返回类型。但事实上我们并不知道 `add()` 这个函数会做什么样的操作，以及获得一个什么样的返回类型。 在 C++11 中这个问题得到解决。虽然你可能马上会反应出来使用 `decltype` 推导 `x+y` 的类型，写出这样的代码： diff --git a/code/2/2.06.auto.cpp b/code/2/2.06.auto.cpp index 714d52dd..49227807 100644 --- a/code/2/2.06.auto.cpp +++ b/code/2/2.06.auto.cpp @@ -21,10 +21,9 @@ class MagicFoo { } }; -// wrong -// int add(auto x, auto y) { -// return x+y; -// } +int add(auto x, auto y) { // Supported in C++20 + return x+y; +} int main() { MagicFoo magicFoo = {1, 2, 3, 4, 5}; @@ -34,10 +33,11 @@ int main() { } std::cout << std::endl; - auto i = 5; // type int - auto j = 6; // type int - auto arr = new auto(10); // type int* - // auto auto_arr2[10] = {arr}; - // std::cout << add(i, j) << std::endl; + auto i = 5; // type int + auto j = 6; // type int + std::cout << add(i, j) << std::endl; + + auto arr = new auto(10); // type int* + // auto auto_arr2[10] = {arr}; // invalid return 0; } \ No newline at end of file From ed88f4efbb3f112eb131bc0510272510f51b5cd1 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:19:11 +0200 Subject: [PATCH 22/77] website: update dependencies --- website/package-lock.json | 1334 +++++++++---------------------------- 1 file changed, 303 insertions(+), 1031 deletions(-) diff --git a/website/package-lock.json b/website/package-lock.json index 7a49362c..a87eb11a 100644 --- a/website/package-lock.json +++ b/website/package-lock.json @@ -21,27 +21,23 @@ }, "node_modules/@zeit/schemas": { "version": "2.6.0", - "resolved": "https://registry.npmjs.org/@zeit/schemas/-/schemas-2.6.0.tgz", - "integrity": "sha512-uUrgZ8AxS+Lio0fZKAipJjAh415JyrOZowliZAzmnJSsf7piVL5w+G0+gFJ0KSu3QRhvui/7zuvpLz03YjXAhg==", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/a-sync-waterfall": { "version": "1.0.1", - "resolved": "https://registry.npmjs.org/a-sync-waterfall/-/a-sync-waterfall-1.0.1.tgz", - "integrity": "sha512-RYTOHHdWipFUliRFMCS4X2Yn2X8M87V/OpSqWzKKOGhzqyUxzyVmhHDH9sAvG+ZuQf/TAOFsLCpMw09I1ufUnA==", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/abbrev": { "version": "1.1.1", - "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", - "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==", - "dev": true + "dev": true, + "license": "ISC" }, "node_modules/accepts": { "version": "1.3.7", - "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz", - "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==", "dev": true, + "license": "MIT", "dependencies": { "mime-types": "~2.1.24", "negotiator": "0.6.2" @@ -52,9 +48,8 @@ }, "node_modules/ajv": { "version": "6.5.3", - "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.3.tgz", - "integrity": "sha512-LqZ9wY+fx3UMiiPd741yB2pj3hhil+hQc8taf4o2QGRFpWgZ2V5C8HA165DY9sS3fJwsk7uT7ZlFEyC3Ig3lLg==", "dev": true, + "license": "MIT", "dependencies": { "fast-deep-equal": "^2.0.1", "fast-json-stable-stringify": "^2.0.0", @@ -64,35 +59,31 @@ }, "node_modules/amdefine": { "version": "1.0.1", - "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz", - "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=", + "license": "BSD-3-Clause OR MIT", "engines": { "node": ">=0.4.2" } }, "node_modules/ansi-align": { "version": "2.0.0", - "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz", - "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=", "dev": true, + "license": "ISC", "dependencies": { "string-width": "^2.0.0" } }, "node_modules/ansi-regex": { "version": "5.0.0", - "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz", - "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==", "dev": true, + "license": "MIT", "engines": { "node": ">=8" } }, "node_modules/ansi-styles": { "version": "4.3.0", - "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz", - "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==", "dev": true, + "license": "MIT", "dependencies": { "color-convert": "^2.0.1" }, @@ -105,9 +96,8 @@ }, "node_modules/anymatch": { "version": "3.1.1", - "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz", - "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==", "dev": true, + "license": "ISC", "dependencies": { "normalize-path": "^3.0.0", "picomatch": "^2.0.4" @@ -118,8 +108,6 @@ }, "node_modules/arch": { "version": "2.2.0", - "resolved": "https://registry.npmjs.org/arch/-/arch-2.2.0.tgz", - "integrity": "sha512-Of/R0wqp83cgHozfIYLbBMnej79U/SVGOOyuB3VVFv1NRM/PSFMK12x9KVtiYzJqmnU5WR2qp0Z5rHb7sWGnFQ==", "dev": true, "funding": [ { @@ -134,45 +122,40 @@ "type": "consulting", "url": "https://feross.org/support" } - ] + ], + "license": "MIT" }, "node_modules/archy": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz", - "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/arg": { "version": "2.0.0", - "resolved": "https://registry.npmjs.org/arg/-/arg-2.0.0.tgz", - "integrity": "sha512-XxNTUzKnz1ctK3ZIcI2XUPlD96wbHP2nGqkPKpvk/HNRlPveYrXIVSTk9m3LcqOgDPg3B1nMvdV/K8wZd7PG4w==", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/argparse": { "version": "1.0.10", - "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz", - "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==", "dev": true, + "license": "MIT", "dependencies": { "sprintf-js": "~1.0.2" } }, "node_modules/argparse/node_modules/sprintf-js": { "version": "1.0.3", - "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz", - "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=", - "dev": true + "dev": true, + "license": "BSD-3-Clause" }, "node_modules/asap": { "version": "2.0.6", - "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz", - "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/atob": { "version": "2.1.2", - "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz", - "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==", + "license": "(MIT OR Apache-2.0)", "bin": { "atob": "bin/atob.js" }, @@ -182,28 +165,24 @@ }, "node_modules/balanced-match": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz", - "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=" + "license": "MIT" }, "node_modules/binary-extensions": { "version": "2.1.0", - "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.1.0.tgz", - "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==", "dev": true, + "license": "MIT", "engines": { "node": ">=8" } }, "node_modules/bluebird": { "version": "3.7.2", - "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz", - "integrity": "sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg==" + "license": "MIT" }, "node_modules/boxen": { "version": "1.3.0", - "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.3.0.tgz", - "integrity": "sha512-TNPjfTr432qx7yOjQyaXm3dSR0MH9vXp7eT1BFSl/C51g+EFnOR9hTg1IreahGBmDNCehscshe45f+C1TBZbLw==", "dev": true, + "license": "MIT", "dependencies": { "ansi-align": "^2.0.0", "camelcase": "^4.0.0", @@ -219,9 +198,8 @@ }, "node_modules/boxen/node_modules/ansi-styles": { "version": "3.2.1", - "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz", - "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==", "dev": true, + "license": "MIT", "dependencies": { "color-convert": "^1.9.0" }, @@ -231,9 +209,8 @@ }, "node_modules/boxen/node_modules/chalk": { "version": "2.4.2", - "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz", - "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==", "dev": true, + "license": "MIT", "dependencies": { "ansi-styles": "^3.2.1", "escape-string-regexp": "^1.0.5", @@ -245,42 +222,37 @@ }, "node_modules/boxen/node_modules/color-convert": { "version": "1.9.3", - "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz", - "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==", "dev": true, + "license": "MIT", "dependencies": { "color-name": "1.1.3" } }, "node_modules/boxen/node_modules/color-name": { "version": "1.1.3", - "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz", - "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=", - "dev": true + "dev": true, + "license": "MIT" }, "node_modules/boxen/node_modules/escape-string-regexp": { "version": "1.0.5", - "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz", - "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=", "dev": true, + "license": "MIT", "engines": { "node": ">=0.8.0" } }, "node_modules/boxen/node_modules/has-flag": { "version": "3.0.0", - "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz", - "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=", "dev": true, + "license": "MIT", "engines": { "node": ">=4" } }, "node_modules/boxen/node_modules/supports-color": { "version": "5.5.0", - "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz", - "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==", "dev": true, + "license": "MIT", "dependencies": { "has-flag": "^3.0.0" }, @@ -290,8 +262,7 @@ }, "node_modules/brace-expansion": { "version": "1.1.11", - "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz", - "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==", + "license": "MIT", "dependencies": { "balanced-match": "^1.0.0", "concat-map": "0.0.1" @@ -299,9 +270,8 @@ }, "node_modules/braces": { "version": "3.0.2", - 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"integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==", "dev": true, "requires": { "is-number": "^7.0.0" } }, "tslib": { - "version": "2.0.3", - "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.0.3.tgz", - "integrity": "sha512-uZtkfKblCEQtZKBF6EBXVZeQNl82yqtDQdv+eck8u7tdPxjLu2/lp5/uPW+um2tpuxINHWy3GhiccY7QgEaVHQ==" + "version": "2.0.3" }, "update-check": { "version": "1.5.2", - "resolved": "https://registry.npmjs.org/update-check/-/update-check-1.5.2.tgz", - "integrity": "sha512-1TrmYLuLj/5ZovwUS7fFd1jMH3NnFDN1y1A8dboedIDt7zs/zJMo6TwwlhYKkSeEwzleeiSBV5/3c9ufAQWDaQ==", "dev": true, "requires": { "registry-auth-token": "3.3.2", @@ -3993,8 +3283,6 @@ }, "uri-js": { "version": "4.4.0", - "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz", - "integrity": "sha512-B0yRTzYdUCCn9n+F4+Gh4yIDtMQcaJsmYBDsTSG8g/OejKBodLQ2IHfN3bM7jUsRXndopT7OIXWdYqc1fjmV6g==", "dev": true, "requires": { "punycode": "^2.1.0" @@ -4002,27 +3290,19 @@ "dependencies": { "punycode": { "version": "2.1.1", - "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz", - "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==", "dev": true } } }, "urix": { - "version": "0.1.0", - "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz", - "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=" + "version": "0.1.0" }, "vary": { "version": "1.1.2", - "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz", - "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=", "dev": true }, "warehouse": { "version": "4.0.0", - "resolved": "https://registry.npmjs.org/warehouse/-/warehouse-4.0.0.tgz", - "integrity": "sha512-9i6/JiHzjnyene5Pvvl2D2Pd18no129YGy0C0P7x18iTz/SeO9nOBioR64XoCy5xKwBKQtl3MU361qpr0V9uXw==", "dev": true, "requires": { "bluebird": "^3.2.2", @@ -4035,30 +3315,22 @@ }, "which": { "version": "2.0.2", - "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz", - "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==", "requires": { "isexe": "^2.0.0" } }, "widest-line": { "version": "2.0.1", - "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz", - "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==", "dev": true, "requires": { "string-width": "^2.1.1" } }, "wrappy": { - "version": "1.0.2", - "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", - "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=" + "version": "1.0.2" }, "yallist": { "version": "2.1.2", - "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz", - "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=", "dev": true } } From 529399ffcd46319df179afca67ff58586567fecb Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:27:20 +0200 Subject: [PATCH 23/77] pdf: use printf over echo echo may introduce inconsistent behaviors over different platforms. printf is considered better than echo. See: https://unix.stackexchange.com/questions/65803/why-is-printf-better-than-echo Fixes #188 --- pdf/en-us/Makefile | 4 ++-- pdf/zh-cn/Makefile | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/pdf/en-us/Makefile b/pdf/en-us/Makefile index 7846a52f..51bf6129 100644 --- a/pdf/en-us/Makefile +++ b/pdf/en-us/Makefile @@ -6,8 +6,8 @@ revision = $(shell git describe --always --tags) all: revision pdf revision: - @echo '% Autogenerated, do not edit' > revision.tex - @echo '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex + printf '%% Autogenerated, do not edit\n' > revision.tex + printf '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex pdf: markdown @echo "Compiling PDF file..." diff --git a/pdf/zh-cn/Makefile b/pdf/zh-cn/Makefile index ac0b42af..6a6f9408 100644 --- a/pdf/zh-cn/Makefile +++ b/pdf/zh-cn/Makefile @@ -6,8 +6,8 @@ revision = $(shell git describe --always --tags) all: revision pdf revision: - @echo '% Autogenerated, do not edit' > revision.tex - @echo '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex + printf '%% Autogenerated, do not edit\n' > revision.tex + printf '\\newcommand{\\revision}{'$(revision)'}' >> revision.tex pdf: markdown @echo "Compiling PDF file..." From e202554f1655777d9b3515d0b7dbe41f0bbf3fb1 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:33:44 +0200 Subject: [PATCH 24/77] book: import correct header Fixes #192 Fixes #147 --- book/en-us/03-runtime.md | 2 ++ book/zh-cn/03-runtime.md | 3 ++- code/3/3.1.lambda.basic.cpp | 3 ++- 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index f7a71c97..b11c9bb9 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -105,6 +105,8 @@ The type of the captured variable being declared is judged according to the expr and the judgment is the same as using `auto`: ```cpp +#include + void lambda_expression_capture() { auto important = std::make_unique(1); auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int { diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 2b8a76f5..7752c9c5 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -90,7 +90,8 @@ C++14 给与了我们方便，允许捕获的成员用任意的表达式进行 ```cpp #include -#include +#include // std::make_unique +#include // std::move int main() { auto important = std::make_unique(1); diff --git a/code/3/3.1.lambda.basic.cpp b/code/3/3.1.lambda.basic.cpp index 085dadc9..a0b80630 100644 --- a/code/3/3.1.lambda.basic.cpp +++ b/code/3/3.1.lambda.basic.cpp @@ -9,7 +9,8 @@ #include -#include +#include // std::make_unique +#include // std::move void lambda_value_capture() { int value = 1; From 6f5615b971da5b79a34f7bbd57e4918f29f90029 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:36:35 +0200 Subject: [PATCH 25/77] book: fix an inconsistency between en-us and zh-cn --- book/en-us/03-runtime.md | 4 +++- book/zh-cn/03-runtime.md | 7 +++---- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index b11c9bb9..907c112e 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -105,7 +105,9 @@ The type of the captured variable being declared is judged according to the expr and the judgment is the same as using `auto`: ```cpp -#include +#include +#include // std::make_unique +#include // std::move void lambda_expression_capture() { auto important = std::make_unique(1); diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 7752c9c5..debfd6e2 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -67,7 +67,7 @@ void lambda_reference_capture() { } ``` -**3. 隐式捕获** +#### 3. 隐式捕获 手动书写捕获列表有时候是非常复杂的，这种机械性的工作可以交给编译器来处理，这时候可以在捕获列表中写一个 `&` 或 `=` 向编译器声明采用引用捕获或者值捕获. @@ -79,7 +79,7 @@ void lambda_reference_capture() { - \[&\] 引用捕获, 让编译器自行推导引用列表 - \[=\] 值捕获, 让编译器自行推导值捕获列表 -**4. 表达式捕获** +#### 4. 表达式捕获 > 这部分内容需要了解后面马上要提到的右值引用以及智能指针 @@ -93,13 +93,12 @@ C++14 给与了我们方便，允许捕获的成员用任意的表达式进行 #include // std::make_unique #include // std::move -int main() { +void lambda_expression_capture() { auto important = std::make_unique(1); auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int { return x+y+v1+(*v2); }; std::cout << add(3,4) << std::endl; - return 0; } ``` From 309f1f3731f774827c64f55cf4404a1685edecee Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:41:16 +0200 Subject: [PATCH 26/77] book: wrap code Fixes #186 --- book/en-us/02-usability.md | 7 +++++-- book/zh-cn/02-usability.md | 7 +++++-- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 935fce6f..f2892396 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -312,7 +312,8 @@ be used as a formal parameter of a normal function, for example: ```Cpp public: void foo(std::initializer_list list) { - for (std::initializer_list::iterator it = list.begin(); it != list.end(); ++it) vec.push_back(*it); + for (std::initializer_list::iterator it = list.begin(); + it != list.end(); ++it) vec.push_back(*it); } magicFoo.foo({6,7,8,9}); @@ -1046,7 +1047,9 @@ And we want to get the value of the enumeration value, we will have to explicitl ```cpp #include template -std::ostream& operator<<(typename std::enable_if::value, std::ostream>::type& stream, const T& e) +std::ostream& operator<<( + typename std::enable_if::value, + std::ostream>::type& stream, const T& e) { return stream << static_cast::type>(e); } diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 489eea5b..18f2d53f 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -258,7 +258,8 @@ int main() { ```Cpp public: void foo(std::initializer_list list) { - for (std::initializer_list::iterator it = list.begin(); it != list.end(); ++it) vec.push_back(*it); + for (std::initializer_list::iterator it = list.begin(); + it != list.end(); ++it) vec.push_back(*it); } magicFoo.foo({6,7,8,9}); @@ -964,7 +965,9 @@ if (new_enum::value3 == new_enum::value4) { ```cpp #include template -std::ostream& operator<<(typename std::enable_if::value, std::ostream>::type& stream, const T& e) +std::ostream& operator<<( + typename std::enable_if::value, + std::ostream>::type& stream, const T& e) { return stream << static_cast::type>(e); } From b0f6f30988ac2893140a976391991d84adf995d1 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 12:41:48 +0200 Subject: [PATCH 27/77] book: fmt --- book/en-us/05-pointers.md | 6 ++---- book/zh-cn/05-pointers.md | 6 ++---- 2 files changed, 4 insertions(+), 8 deletions(-) diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index 90c83b41..acd8ebec 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -36,12 +36,10 @@ And return the `std::shared_ptr` pointer of this object type. For example: ```cpp #include #include -void foo(std::shared_ptr i) -{ +void foo(std::shared_ptr i) { (*i)++; } -int main() -{ +int main() { // auto pointer = new int(10); // illegal, no direct assignment // Constructed a std::shared_ptr auto pointer = std::make_shared(10); diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index 010af297..6688bd18 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -38,12 +38,10 @@ order: 5 ```cpp #include #include -void foo(std::shared_ptr i) -{ +void foo(std::shared_ptr i) { (*i)++; } -int main() -{ +int main() { // auto pointer = new int(10); // illegal, no direct assignment // Constructed a std::shared_ptr auto pointer = std::make_shared(10); From 93ce6490a60dc3b62d8a9c65e5dffe5589ccb200 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 13:10:34 +0200 Subject: [PATCH 28/77] book: revise release acquire semantics Fixes #174 --- book/en-us/07-thread.md | 5 +++-- book/zh-cn/07-thread.md | 4 ++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 412e7905..b9e58061 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -464,8 +464,9 @@ To achieve the ultimate performance and achieve consistency of various strength 3. Release/Acquire model: Under this model, we can further tighten the order of atomic operations between different threads, specifying the timing between releasing `std::memory_order_release` and getting `std::memory_order_acquire`. **All** write operations before the release operation is visible to any other thread, i.e., happens before. - As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a forward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a backward barrier. For the `std::memory_order_acq_rel` option, combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation. - + As you can see, `std::memory_order_release` ensures that a write before a release does not occur after the release operation, which is a **backward barrier**, and `std::memory_order_acquire` ensures that a subsequent read or write after a acquire does not occur before the acquire operation, which is a **forward barrier**. + For the `std::memory_order_acq_rel` option, combines the characteristics of the two barriers and determines a unique memory barrier, such that reads and writes of the current thread will not be rearranged across the barrier. + Let's check an example: ```cpp diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index 1e81fd08..4eef9926 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -472,9 +472,9 @@ int main() { consumer.join(); ``` -3. 释放/获取模型：在此模型下，我们可以进一步加紧对不同线程间原子操作的顺序的限制，在释放 `std::memory_order_release` 和获取 `std::memory_order_acquire` 之间规定时序，即发生在释放操作之前的**所有**写操作，对其他线程的任何获取操作都是可见的，亦即发生顺序（happens-before）。 +3. 释放/获取模型：在此模型下，我们可以进一步加紧对不同线程间原子操作的顺序的限制，在释放 `std::memory_order_release` 和获取 `std::memory_order_acquire` 之间规定时序，即发生在释放（release）操作之前的**所有**写操作，对其他线程的任何获取（acquire）操作都是可见的，亦即发生顺序（happens-before）。 - 可以看到，`std::memory_order_release` 确保了它之后的写行为不会发生在释放操作之前，是一个向前的屏障，而 `std::memory_order_acquire` 确保了它之前的写行为，不会发生在该获取操作之后，是一个向后的屏障。对于选项 `std::memory_order_acq_rel` 而言，则结合了这两者的特点，唯一确定了一个内存屏障，使得当前线程对内存的读写不会被重排到此操作的前后。 + 可以看到，`std::memory_order_release` 确保了它之前的写操作不会发生在释放操作之后，是一个向后的屏障（backward），而 `std::memory_order_acquire` 确保了它之前的写行为不会发生在该获取操作之后，是一个向前的屏障（forward）。对于选项 `std::memory_order_acq_rel` 而言，则结合了这两者的特点，唯一确定了一个内存屏障，使得当前线程对内存的读写不会被重排并越过此操作的前后： 我们来看一个例子： From 55da3fd45204c68f6278e0181e99cb42f7692c9b Mon Sep 17 00:00:00 2001 From: "Raine Adams (they/them)" <67432346+rainealexander@users.noreply.github.com> Date: Wed, 11 Aug 2021 06:16:56 -0500 Subject: [PATCH 29/77] book: revise preface (#197) --- book/en-us/00-preface.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/book/en-us/00-preface.md b/book/en-us/00-preface.md index 83835094..067cf0ea 100644 --- a/book/en-us/00-preface.md +++ b/book/en-us/00-preface.md @@ -10,14 +10,14 @@ order: 0 ## Introduction -C++ user group is fairly large. From the advent of C++98 to the official finalization of C++11, it has accumulated over a decade. C++14/17 is an important complement and optimization for C++11, and C++20 brings this language to the door of modernization. The extended features of all these new standards are given to the C++ language. Infused with new vitality. -C++ programmers, who are still using **traditional C++** (this book refers to C++98 and its previous C++ standards as traditional C++), may even amazed by the fact that they are not using the same language while reading modern C++ code. +The C++ programming language owns a fairly large user group. From the advent of C++98 to the official finalization of C++11, it has continued to stay relevant. C++14/17 is an important complement and optimization for C++11, and C++20 brings this language to the door of modernization. The extended features of all these new standards are integrated into the C++ language and infuse it with new vitality. +C++ programmers who are still using **traditional C++** (this book refers to C++98 and its previous standards as traditional C++) may even amazed by the fact that they are not using the same language while reading modern C++ code. -**Modern C++** (this book refers to C++11/14/17/20) introduces a lot of features into traditional C++, which makes the whole C++ become a language that modernized. Modern C++ not only enhances the usability of the C++ language itself, but the modification of the `auto` keyword semantics gives us more confidence in manipulating extremely complex template types. At the same time, a lot of enhancements have been made to the language runtime. The emergence of Lambda expressions has made C++ have the "closure" feature of "anonymous functions", which is almost in modern programming languages ​​(such as Python, Swift, etc). It has become commonplace, and the emergence of rvalue references has solved the problem of temporary object efficiency that C++ has long been criticized for. +**Modern C++** (this book refers to C++11/14/17/20) introduces many features into traditional C++ which bring the entire language to a new level of modernization. Modern C++ not only enhances the usability of the C++ language itself, but the modification of the `auto` keyword semantics gives us more confidence in manipulating extremely complex template types. At the same time, a lot of enhancements have been made to the language runtime. The emergence of Lambda expressions has given C++ the "closure" feature of "anonymous functions", which are in almost all modern programming languages ​​(such as Python, Swift, etc). It has become commonplace, and the emergence of rvalue references has solved the problem of temporary object efficiency that C++ has long been criticized for. C++17 is the direction that has been promoted by the C++ community in the past three years. It also points out an important development direction of **modern C++** programming. Although it does not appear as much as C++11, it contains a large number of small and beautiful languages ​​and features (such as structured binding), and the appearance of these features once again corrects our programming paradigm in C++. -Modern C++ also adds a lot of tools and methods to its standard library, such as `std::thread` at the level of the language itself, which supports concurrent programming and no longer depends on the underlying system on different platforms. The API implements cross-platform support at the language level; `std::regex` provides full regular expression support and more. C++98 has been proven to be a very successful "paradigm", and the emergence of modern C++ further promotes this paradigm, making C++ a better language for system programming and library development. Concepts verify the compile-time of template parameters, further enhancing the usability of the language. +Modern C++ also adds a lot of tools and methods to its standard library such as `std::thread` at the level of the language itself, which supports concurrent programming and no longer depends on the underlying system on different platforms. The API implements cross-platform support at the language level; `std::regex` provides full regular expression support and more. C++98 has been proven to be a very successful "paradigm", and the emergence of modern C++ further promotes this paradigm, making C++ a better language for system programming and library development. Concepts verify the compile-time of template parameters, further enhancing the usability of the language. In conclusion, as an advocate and practitioner of C++, we always maintain an open mind to accept new things, and we can promote the development of C++ faster, making this old and novel language more vibrant. @@ -30,7 +30,7 @@ In conclusion, as an advocate and practitioner of C++, we always maintain an ope ## Purpose The book claims "On the Fly". It intends to provide a comprehensive introduction to the relevant features regarding modern C++ (before the 2020s). -Readers can choose interesting content according to the following table of content to learn and quickly familiarize the new features you would like to learn. +Readers can choose interesting content according to the following table of contents to learn and quickly familiarize themselves with the new features that are available. Readers should aware that all of these features are not required. It should be learned when you need it. At the same time, instead of grammar-only, the book introduces the historical background as simple as possible of its technical requirements, which provides great help in understanding why these features come out. From 9ff1deb882de8416562f15a421c45c881eb5738f Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Wed, 11 Aug 2021 13:20:31 +0200 Subject: [PATCH 30/77] website: update dependencies --- website/package-lock.json | 26 ++++++++++++++++---------- website/package.json | 2 +- 2 files changed, 17 insertions(+), 11 deletions(-) diff --git a/website/package-lock.json b/website/package-lock.json index a87eb11a..d00cd6f4 100644 --- a/website/package-lock.json +++ b/website/package-lock.json @@ -11,7 +11,7 @@ "hexo-generator-index": "^2.0.0", "hexo-image-caption": "^0.1.1", "hexo-renderer-ejs": "^1.0.0", - "hexo-renderer-marked": "^3.3.0", + "hexo-renderer-marked": "^4.0.0", "hexo-renderer-stylus": "^2.0.1" }, "devDependencies": { @@ -893,11 +893,12 @@ } }, "node_modules/hexo-renderer-marked": { - "version": "3.3.0", - "license": "MIT", + "version": "4.0.0", + "resolved": "https://registry.npmjs.org/hexo-renderer-marked/-/hexo-renderer-marked-4.0.0.tgz", + "integrity": "sha512-Rc9tPqCEX+UjKhAHF2AmH4FcIqVSW7FTKH6kAhMWAn/WMxrCD3Al+99zKnnbgaLJ6TOCb1ckvB4BRkwk62ITxQ==", "dependencies": { "hexo-util": "^2.1.0", - "marked": "^1.0.0" + "marked": "^2.0.0" }, "engines": { "node": ">=10.13.0" @@ -1100,13 +1101,14 @@ } }, "node_modules/marked": { - "version": "1.2.7", - "license": "MIT", + "version": "2.1.3", + "resolved": "https://registry.npmjs.org/marked/-/marked-2.1.3.tgz", + "integrity": "sha512-/Q+7MGzaETqifOMWYEA7HVMaZb4XbcRfaOzcSsHZEith83KGlvaSG33u0SKu89Mj5h+T8V2hM+8O45Qc5XTgwA==", "bin": { "marked": "bin/marked" }, "engines": { - "node": ">= 8.16.2" + "node": ">= 10" } }, "node_modules/micromatch": { @@ -2586,10 +2588,12 @@ } }, "hexo-renderer-marked": { - "version": "3.3.0", + "version": "4.0.0", + "resolved": "https://registry.npmjs.org/hexo-renderer-marked/-/hexo-renderer-marked-4.0.0.tgz", + "integrity": "sha512-Rc9tPqCEX+UjKhAHF2AmH4FcIqVSW7FTKH6kAhMWAn/WMxrCD3Al+99zKnnbgaLJ6TOCb1ckvB4BRkwk62ITxQ==", "requires": { "hexo-util": "^2.1.0", - "marked": "^1.0.0" + "marked": "^2.0.0" } }, "hexo-renderer-stylus": { @@ -2722,7 +2726,9 @@ } }, "marked": { - "version": "1.2.7" + "version": "2.1.3", + "resolved": "https://registry.npmjs.org/marked/-/marked-2.1.3.tgz", + "integrity": "sha512-/Q+7MGzaETqifOMWYEA7HVMaZb4XbcRfaOzcSsHZEith83KGlvaSG33u0SKu89Mj5h+T8V2hM+8O45Qc5XTgwA==" }, "micromatch": { "version": "4.0.2", diff --git a/website/package.json b/website/package.json index 98073dfc..6fb9d859 100755 --- a/website/package.json +++ b/website/package.json @@ -9,7 +9,7 @@ "hexo-generator-index": "^2.0.0", "hexo-image-caption": "^0.1.1", "hexo-renderer-ejs": "^1.0.0", - "hexo-renderer-marked": "^3.3.0", + "hexo-renderer-marked": "^4.0.0", "hexo-renderer-stylus": "^2.0.1" }, "devDependencies": { From 7f46de1a6c702d95bc76118bf8e8e6a36e007a85 Mon Sep 17 00:00:00 2001 From: Killer_Quinn <51754303+Certseeds@users.noreply.github.com> Date: Sat, 14 Aug 2021 19:27:16 +0800 Subject: [PATCH 31/77] book: typo fixes (#204) --- book/en-us/03-runtime.md | 2 +- book/zh-cn/03-runtime.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 907c112e..878c127c 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -345,7 +345,7 @@ int main() const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can extend temp variable's lifecycle // lv2 += "Test"; // illegal, const ref can't be modified - std::cout << lv2 << std::endl; // string,string + std::cout << lv2 << std::endl; // string,string, std::string&& rv2 = lv1 + lv2; // legal, rvalue ref extend lifecycle rv2 += "string"; // legal, non-const reference can be modified diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index debfd6e2..3738bc1a 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -293,7 +293,7 @@ int main() const std::string& lv2 = lv1 + lv1; // 合法, 常量左值引用能够延长临时变量的生命周期 // lv2 += "Test"; // 非法, 常量引用无法被修改 - std::cout << lv2 << std::endl; // string,string + std::cout << lv2 << std::endl; // string,string, std::string&& rv2 = lv1 + lv2; // 合法, 右值引用延长临时对象生命周期 rv2 += "Test"; // 合法, 非常量引用能够修改临时变量 From 19ceeb7b4f5a2cc270985625f1a442871fc9ce96 Mon Sep 17 00:00:00 2001 From: Timothy Date: Sun, 29 Aug 2021 03:57:04 +0800 Subject: [PATCH 32/77] book: add missing semicolon (#205) --- book/en-us/02-usability.md | 2 +- book/zh-cn/02-usability.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index f2892396..e0c26525 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -480,7 +480,7 @@ You may think that when we introduce `auto`, we have already mentioned that `aut ```cpp template R add(T x, U y) { - return x+y + return x+y; } ``` diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 18f2d53f..b4710e2d 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -413,7 +413,7 @@ type z == type x ```cpp template R add(T x, U y) { - return x+y + return x+y; } ``` From c172682723f0c02c6fac7fab48221bb5cc74aa56 Mon Sep 17 00:00:00 2001 From: Okami Wong Date: Tue, 16 Nov 2021 16:21:53 +0800 Subject: [PATCH 33/77] book: fix typo (#215) --- book/en-us/07-thread.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index b9e58061..375e8deb 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -322,7 +322,7 @@ int main() { } ``` -### Concistency Model +### Consistency Model Multiple threads executing in parallel, discussed at some macro level, can be roughly considered a distributed system. In a distributed system, any communication or even local operation takes a certain amount of time, and even unreliable communication occurs. @@ -366,7 +366,7 @@ Weakening the synchronization conditions between processes, usually we will cons x.store(2) ``` - Under the order consistency requirement, `x.load()` must read the last written data, so `x.store(2)` and `x.store(1)` do not have any guarantees, ie As long as `x.store(2)` of `T2` occurs before `x.store(3)`. + Under the order consistency requirement, `x.load()` must read the last written data, so `x.store(2)` and `x.store(1)` do not have any guarantees, as long as `x.store(2)` of `T2` occurs before `x.store(3)`. 3. Causal consistency: its requirements are further reduced, only the sequence of causal operations is guaranteed, and the order of non-causal operations is not required. @@ -440,7 +440,7 @@ To achieve the ultimate performance and achieve consistency of various strength std::cout << "current counter:" << counter << std::endl; ``` -2. Release/consumption model: In this model, we begin to limit the order of operations between processes. If a thread needs to modify a value, but another thread will have a dependency on that operation of the value, that is, the latter depends. former. Specifically, thread A has completed three writes to `x`, and thread `B` relies only on the third `x` write operation, regardless of the first two write behaviors of `x`, then `A ` When active `x.release()` (ie using `std::memory_order_release`), the option `std::memory_order_consume` ensures that `B` observes `A` when calling `x.load()` Three writes to `x`. Let's look at an example: +2. Release/consumption model: In this model, we begin to limit the order of operations between processes. If a thread needs to modify a value, but another thread will have a dependency on that operation of the value, that is, the latter depends on the former. Specifically, thread A has completed three writes to `x`, and thread `B` relies only on the third `x` write operation, regardless of the first two write behaviors of `x`, then `A ` When active `x.release()` (ie using `std::memory_order_release`), the option `std::memory_order_consume` ensures that `B` observes `A` when calling `x.load()` Three writes to `x`. Let's look at an example: ```cpp // initialize as nullptr to prevent consumer load a dangling pointer From 37401ada8b98a1ec47f288afa6cb01337ca2e4b3 Mon Sep 17 00:00:00 2001 From: Dw9 <36155473+Dw9@users.noreply.github.com> Date: Sat, 20 Nov 2021 23:01:25 +0800 Subject: [PATCH 34/77] book: add std::weak_ptr::lock (#216) --- book/en-us/05-pointers.md | 3 ++- book/zh-cn/05-pointers.md | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index acd8ebec..2e248803 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -185,7 +185,8 @@ The solution to this problem is to use the weak reference pointer `std::weak_ptr In the above figure, only B is left in the last step, and B does not have any smart pointers to reference it, so this memory resource will also be released. -`std::weak_ptr` has no `*` operator and `->` operator, so it can't operate on resources. Its only function is to check if `std::shared_ptr` exists, its `expired()` method can return `false` when the resource is not released, otherwise, it returns `true`. +`std::weak_ptr` has no implemented `*` and `->` operators, therefore it cannot operate on resources. `std::weak_ptr` allows us to check if a `std::shared_ptr` exists or not. The `expired()` method of a `std::weak_ptr` returns `false` when the resource is not released; Otherwise, it returns `true`. +Furthermore, it can also be used for the purpose of obtaining `std::shared_ptr`, which points to the original object. The `lock()` method returns a `std::shared_ptr` to the original object when the resource is not released, or `nullptr` otherwise. ## Conclusion diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index 6688bd18..bdfaf595 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -173,7 +173,7 @@ int main() { 在上图中，最后一步只剩下 B，而 B 并没有任何智能指针引用它，因此这块内存资源也会被释放。 -`std::weak_ptr` 没有 `*` 运算符和 `->` 运算符，所以不能够对资源进行操作，它的唯一作用就是用于检查 `std::shared_ptr` 是否存在，其 `expired()` 方法能在资源未被释放时，会返回 `false`，否则返回 `true`。 +`std::weak_ptr` 没有 `*` 运算符和 `->` 运算符，所以不能够对资源进行操作，它可以用于检查 `std::shared_ptr` 是否存在，其 `expired()` 方法能在资源未被释放时，会返回 `false`，否则返回 `true`；除此之外，它也可以用于获取指向原始对象的 `std::shared_ptr` 指针，其 `lock()` 方法在原始对象未被释放时，返回一个指向原始对象的 `std::shared_ptr` 指针，进而访问原始对象的资源，否则返回`nullptr`。 ## 总结 From 1ce9b168677d348fc1df1a312c0afd338e36d158 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sat, 20 Nov 2021 16:03:38 +0100 Subject: [PATCH 35/77] all: remove digitalocean as it is not our sponsor anymore --- README-zh-cn.md | 7 ------- README.md | 7 ------- website/src/modern-cpp/about/ack.md | 14 -------------- 3 files changed, 28 deletions(-) diff --git a/README-zh-cn.md b/README-zh-cn.md index 1b0aef83..e1908f9e 100644 --- a/README-zh-cn.md +++ b/README-zh-cn.md @@ -50,13 +50,6 @@ $ make build 笔者时间和水平有限，如果读者发现书中内容的错误，欢迎提 [Issue](https://github.com/changkun/modern-cpp-tutorial/issues)，或者直接提 [Pull request](https://github.com/changkun/modern-cpp-tutorial/pulls)。详细贡献指南请参考[如何参与贡献](CONTRIBUTING.md)，由衷感谢每一位指出本书中出现错误的读者，包括但不限于 [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors)。 -

      本项目还由以下产品提供赞助支持：

      -

      - - - -

      - ## 许可 知识共享许可协议 diff --git a/README.md b/README.md index 537b6adb..afbac08c 100644 --- a/README.md +++ b/README.md @@ -56,13 +56,6 @@ The author has limited time and language skills. If readers find any mistakes in The author is grateful to all contributors, including but not limited to [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors). -

      This project is also supported by:

      -

      - - - -

      - ## Licenses Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](./LICENSE). diff --git a/website/src/modern-cpp/about/ack.md b/website/src/modern-cpp/about/ack.md index 1e3107bf..5d6f17e8 100644 --- a/website/src/modern-cpp/about/ack.md +++ b/website/src/modern-cpp/about/ack.md @@ -12,20 +12,6 @@ The author has limited time and language skills. If readers find any mistakes in The author is grateful to all contributors, including but not limited to [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors). -

      This project is also supported by:

      -

      - - - -

      - ## 致谢 笔者时间和水平有限，如果读者发现书中内容的错误，欢迎提 [Issue](https://github.com/changkun/modern-cpp-tutorial/issues)，或者直接提 [Pull request](https://github.com/changkun/modern-cpp-tutorial/pulls)。详细贡献指南请参考[如何参与贡献](CONTRIBUTING.md)，由衷感谢每一位指出本书中出现错误的读者，包括但不限于 [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors)。 - -

      本项目还由以下产品提供赞助支持：

      -

      - - - -

      \ No newline at end of file From 417d45806b7eb7051ea96630fc5d38395efdbcc8 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sat, 20 Nov 2021 16:08:13 +0100 Subject: [PATCH 36/77] website: upgrade dependencies --- website/package-lock.json | 3263 +++++++++++++++++++++++++++---------- website/package.json | 2 +- 2 files changed, 2359 insertions(+), 906 deletions(-) diff --git a/website/package-lock.json b/website/package-lock.json index d00cd6f4..fba1f465 100644 --- a/website/package-lock.json +++ b/website/package-lock.json @@ -16,28 +16,45 @@ }, "devDependencies": { "hexo": "^5.3.0", - "serve": "^11.3.2" + "serve": "^13.0.2" + } + }, + "node_modules/@tootallnate/once": { + "version": "1.1.2", + "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz", + "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==", + "engines": { + "node": ">= 6" } }, "node_modules/@zeit/schemas": { "version": "2.6.0", - "dev": true, - 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"yallist": { - "version": "2.1.2", - "dev": true + "ws": { + "version": "7.5.5", + "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.5.tgz", + "integrity": "sha512-BAkMFcAzl8as1G/hArkxOxq3G7pjUqQ3gzYbLL0/5zNkph70e+lCoxBGnm6AW1+/aiNeV4fnKqZ8m4GZewmH2w==", + "requires": {} + }, + "xml-name-validator": { + "version": "3.0.0", + "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz", + "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==" + }, + "xmlchars": { + "version": "2.2.0", + "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz", + "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==" } } } diff --git a/website/package.json b/website/package.json index 6fb9d859..8189f797 100755 --- a/website/package.json +++ b/website/package.json @@ -14,6 +14,6 @@ }, "devDependencies": { "hexo": "^5.3.0", - "serve": "^11.3.2" + "serve": "^13.0.2" } } From 761a408d8217e752b40fa7ff7222e0cbb11aa2ac Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Thu, 25 Nov 2021 09:45:33 +0100 Subject: [PATCH 37/77] Revert "all: remove digitalocean as it is not our sponsor anymore" They are our sponsor again! This reverts commit 1ce9b168677d348fc1df1a312c0afd338e36d158. --- README-zh-cn.md | 7 +++++++ README.md | 7 +++++++ website/src/modern-cpp/about/ack.md | 14 ++++++++++++++ 3 files changed, 28 insertions(+) diff --git a/README-zh-cn.md b/README-zh-cn.md index e1908f9e..1b0aef83 100644 --- a/README-zh-cn.md +++ b/README-zh-cn.md @@ -50,6 +50,13 @@ $ make build 笔者时间和水平有限，如果读者发现书中内容的错误，欢迎提 [Issue](https://github.com/changkun/modern-cpp-tutorial/issues)，或者直接提 [Pull request](https://github.com/changkun/modern-cpp-tutorial/pulls)。详细贡献指南请参考[如何参与贡献](CONTRIBUTING.md)，由衷感谢每一位指出本书中出现错误的读者，包括但不限于 [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors)。 +

      本项目还由以下产品提供赞助支持：

      +

      + + + +

      + ## 许可 知识共享许可协议 diff --git a/README.md b/README.md index afbac08c..537b6adb 100644 --- a/README.md +++ b/README.md @@ -56,6 +56,13 @@ The author has limited time and language skills. If readers find any mistakes in The author is grateful to all contributors, including but not limited to [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors). +

      This project is also supported by:

      +

      + + + +

      + ## Licenses Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](./LICENSE). diff --git a/website/src/modern-cpp/about/ack.md b/website/src/modern-cpp/about/ack.md index 5d6f17e8..1e3107bf 100644 --- a/website/src/modern-cpp/about/ack.md +++ b/website/src/modern-cpp/about/ack.md @@ -12,6 +12,20 @@ The author has limited time and language skills. If readers find any mistakes in The author is grateful to all contributors, including but not limited to [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors). +

      This project is also supported by:

      +

      + + + +

      + ## 致谢 笔者时间和水平有限，如果读者发现书中内容的错误，欢迎提 [Issue](https://github.com/changkun/modern-cpp-tutorial/issues)，或者直接提 [Pull request](https://github.com/changkun/modern-cpp-tutorial/pulls)。详细贡献指南请参考[如何参与贡献](CONTRIBUTING.md)，由衷感谢每一位指出本书中出现错误的读者，包括但不限于 [Contributors](https://github.com/changkun/modern-cpp-tutorial/graphs/contributors)。 + +

      本项目还由以下产品提供赞助支持：

      +

      + + + +

      \ No newline at end of file From e5d90bd6108eb3580423f430af337ae42a8f834d Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Fri, 3 Dec 2021 15:30:07 +0100 Subject: [PATCH 38/77] book, code: add mutex header Fixes #217 --- book/en-us/07-thread.md | 2 ++ book/zh-cn/07-thread.md | 2 ++ code/7/7.2.critical.section.a.cpp | 1 + code/7/7.3.critical.section.b.cpp | 1 + 4 files changed, 6 insertions(+) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 375e8deb..a49caa4d 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -41,6 +41,7 @@ RAII guarantees the exceptional security of the code while keeping the simplicit ```cpp #include +#include #include int v = 1; @@ -80,6 +81,7 @@ For instance: ```cpp #include +#include #include int v = 1; diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index 4eef9926..e4982040 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -42,6 +42,7 @@ RAII 在不失代码简洁性的同时，很好的保证了代码的异常安全 ```cpp #include +#include #include int v = 1; @@ -82,6 +83,7 @@ int main() { ```cpp #include +#include #include int v = 1; diff --git a/code/7/7.2.critical.section.a.cpp b/code/7/7.2.critical.section.a.cpp index 374a3e37..168d8c4d 100644 --- a/code/7/7.2.critical.section.a.cpp +++ b/code/7/7.2.critical.section.a.cpp @@ -8,6 +8,7 @@ // #include +#include #include int v = 1; diff --git a/code/7/7.3.critical.section.b.cpp b/code/7/7.3.critical.section.b.cpp index ad4439d9..930cd196 100644 --- a/code/7/7.3.critical.section.b.cpp +++ b/code/7/7.3.critical.section.b.cpp @@ -8,6 +8,7 @@ // #include +#include #include int v = 1; From b386fff302bee4c6022329336a312b80953a0097 Mon Sep 17 00:00:00 2001 From: Khanh Tran <32532742+khanhtc1202@users.noreply.github.com> Date: Sun, 26 Dec 2021 18:19:38 +0900 Subject: [PATCH 39/77] git: ignore temporarily created build assets (#220) --- .gitignore | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/.gitignore b/.gitignore index 1c18bcf2..f6224793 100644 --- a/.gitignore +++ b/.gitignore @@ -40,6 +40,11 @@ website/src/modern-cpp/zh-cn/* website/src/modern-cpp/en-us/* website/src/modern-cpp/exercises website/src/modern-cpp/code +website/src/modern-cpp/about/donate.md +website/src/modern-cpp/assets/alipay.jpg website/src/modern-cpp/assets/cover-2nd-en.png website/src/modern-cpp/assets/cover-2nd.png -website/src/modern-cpp/assets/figures/* \ No newline at end of file +website/src/modern-cpp/assets/cover-2nd-en-logo.png +website/src/modern-cpp/assets/cover-2nd-logo.png +website/src/modern-cpp/assets/figures/* +website/src/modern-cpp/assets/wechat.jpg From 7e6ada9b7c385959b25e2e8d8b7526ea9d0d677e Mon Sep 17 00:00:00 2001 From: Valeriy Dmitriev Date: Mon, 3 Jan 2022 18:19:32 +0500 Subject: [PATCH 40/77] book: typo fixes (#219) --- book/en-us/07-thread.md | 8 ++++---- book/en-us/08-filesystem.md | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index a49caa4d..7f2d85fb 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -69,7 +69,7 @@ int main() { Because C++ guarantees that all stack objects will be destroyed at the end of the declaration period, such code is also extremely safe. Whether `critical_section()` returns normally or if an exception is thrown in the middle, a stack rollback is thrown, and `unlock()` is automatically called. -And `std::unique_lock` is more flexible than `std::lock_guard`, `std::unique_lock` is more flexible. +`std::unique_lock` is more flexible than `std::lock_guard`. Objects of `std::unique_lock` manage the locking and unlocking operations on the `mutex` object with exclusive ownership (no other `unique_lock` objects owning the ownership of a `mutex` object). So in concurrent programming, it is recommended to use `std::unique_lock`. `std::lock_guard` cannot explicitly call `lock` and `unlock`, and `std::unique_lock` can be called anywhere after the declaration. @@ -255,7 +255,7 @@ int main() { } ``` -Intuitively, `a = 5;` seems in `t2` seems to always execute before `flag = 1;`, and `while (flag != 1)` in `t1` seems to guarantee `std ::cout << "b = " << b << std::endl;` will not be executed before the mark is changed. Logically, it seems that the value of `b` should be equal to 5. +Intuitively, it seems that `a = 5;` in `t2` always executes before `flag = 1;` and `while (flag != 1)` in `t1`. It looks like there is a guarantee the line `std ::cout << "b = " << b << std::endl;` will not be executed before the mark is changed. Logically, it seems that the value of `b` should be equal to 5. But the actual situation is much more complicated than this, or the code itself is undefined behavior because, for `a` and `flag`, they are read and written in two parallel threads. There has been competition. Also, even if we ignore competing for reading and writing, it is still possible to receive out-of-order execution of the CPU and the impact of the compiler on the rearrangement of instructions. Cause `a = 5` to occur after `flag = 1`. Thus `b` may output 0. @@ -272,7 +272,7 @@ This is a very strong set of synchronization conditions, in other words when it This seems too harsh for a variable that requires only atomic operations (no intermediate state). The research on synchronization conditions has a very long history, and we will not go into details here. Readers should understand that under the modern CPU architecture, atomic operations at the CPU instruction level are provided. -Therefore, in the C + + 11 multi-threaded shared variable reading and writing, the introduction of the `std::atomic` template, so that we instantiate an atomic type, will be a +Therefore, in the C++11 multi-threaded shared variable reading and writing, the introduction of the `std::atomic` template, so that we instantiate an atomic type, will be a Atomic type read and write operations are minimized from a set of instructions to a single CPU instruction. E.g: ```cpp @@ -544,7 +544,7 @@ They provide a critical foundation for standardized high-performance computing f ## Further Readings -- [C++ 并发编程(中文版)](https://www.amazon.com/dp/1617294691/ref=cm_sw_em_r_mt_dp_U_siEmDbRMMF960) +- [C++ Concurrency in Action](https://www.amazon.com/dp/1617294691/ref=cm_sw_em_r_mt_dp_U_siEmDbRMMF960) - [Thread document](http://en.cppreference.com/w/cpp/thread) - Herlihy, M. P., & Wing, J. M. (1990). Linearizability: a correctness condition for concurrent objects. ACM Transactions on Programming Languages and Systems, 12(3), 463–492. https://doi.org/10.1145/78969.78972 diff --git a/book/en-us/08-filesystem.md b/book/en-us/08-filesystem.md index d0c86838..078cd76c 100644 --- a/book/en-us/08-filesystem.md +++ b/book/en-us/08-filesystem.md @@ -10,7 +10,7 @@ order: 8 The file system library provides functions related to the operation of the file system, path, regular files, directories, and so on. -Similar to the regular expression library, he was one of the first libraries +Similar to the regular expression library, it was one of the first libraries to be launched by boost and eventually merged into the C++ standard. ## 8.1 Document and Link From 847b53632de7ee76f4a1bc9723dff063bfb5a28c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Lucas=20Vilas-B=C3=B4as?= Date: Mon, 21 Feb 2022 06:47:39 -0300 Subject: [PATCH 41/77] book: add a line break for code formatting (#224) --- book/en-us/02-usability.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index e0c26525..2153b32e 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -299,7 +299,8 @@ int main() { MagicFoo magicFoo = {1, 2, 3, 4, 5}; std::cout << "magicFoo: "; - for (std::vector::iterator it = magicFoo.vec.begin(); it != magicFoo.vec.end(); ++it) std::cout << *it << std::endl; + for (std::vector::iterator it = magicFoo.vec.begin(); it != magicFoo.vec.end(); ++it) + std::cout << *it << std::endl; } ``` From 1db84fe462cb5b94d298957ac4fcbd14ec907473 Mon Sep 17 00:00:00 2001 From: ambiguoustexture <59325440+ambiguoustexture@users.noreply.github.com> Date: Fri, 25 Feb 2022 23:23:03 +0800 Subject: [PATCH 42/77] book, code: fix typos (#225) --- book/zh-cn/03-runtime.md | 2 +- code/3/3.3.rvalue.cpp | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 3738bc1a..e2855df9 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -333,7 +333,7 @@ void foo() { ``` 由于 `int&` 不能引用 `double` 类型的参数，因此必须产生一个临时值来保存 `s` 的值， -从而当 `increase()` 修改这个临时值时，从而调用完成后 `s` 本身并没有被修改。 +从而当 `increase()` 修改这个临时值时，调用完成后 `s` 本身并没有被修改。 第二个问题，为什么常量引用允许绑定到非左值？原因很简单，因为 Fortran 需要。 diff --git a/code/3/3.3.rvalue.cpp b/code/3/3.3.rvalue.cpp index 2406ea83..20b30ca8 100644 --- a/code/3/3.3.rvalue.cpp +++ b/code/3/3.3.rvalue.cpp @@ -20,7 +20,7 @@ void reference(std::string&& str) { int main() { std::string lv1 = "string,"; // lv1 is a lvalue - // std::string&& r1 = s1; // illegal, rvalue can't ref to lvalue + // std::string&& r1 = lv1; // illegal, rvalue can't ref to lvalue std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue std::cout << rv1 << std::endl; // string, From afdc39431f08ac9b71eb1bb8aa997742b2b3b0e8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Lucas=20Vilas-B=C3=B4as?= Date: Mon, 28 Feb 2022 05:58:23 -0300 Subject: [PATCH 43/77] book: add line breaks for code formatting (#226) --- book/en-us/05-pointers.md | 10 ++++++++-- book/en-us/06-regex.md | 38 +++++++++++++++++++++----------------- 2 files changed, 29 insertions(+), 19 deletions(-) diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index 2e248803..fca5ce77 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -58,20 +58,26 @@ auto pointer = std::make_shared(10); auto pointer2 = pointer; // reference count+1 auto pointer3 = pointer; // reference count+1 int *p = pointer.get(); // no increase of reference count + std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 3 std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 3 pointer2.reset(); std::cout << "reset pointer2:" << std::endl; + std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 -std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0, pointer2 has reset +std::cout << "pointer2.use_count() = " + << pointer2.use_count() << std::endl; // 0, pointer2 has reset std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 2 + pointer3.reset(); std::cout << "reset pointer3:" << std::endl; + std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0 -std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 0, pointer3 has reset +std::cout << "pointer3.use_count() = " + << pointer3.use_count() << std::endl; // 0, pointer3 has reset ``` ## 5.3 `std::unique_ptr` diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index 5793645a..6d4f47c8 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -84,7 +84,8 @@ We use a simple example to briefly introduce the use of this library. Consider t int main() { std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"}; - // In C++, `\` will be used as an escape character in the string. In order for `\.` to be passed as a regular expression, it is necessary to perform second escaping of `\`, thus we have `\\.` + // In C++, `\` will be used as an escape character in the string. In order for `\.` + // to be passed as a regular expression, it is necessary to perform second escaping of `\`, thus we have `\\.` std::regex txt_regex("[a-z]+\\.txt"); for (const auto &fname: fnames) std::cout << fname << ": " << std::regex_match(fname, txt_regex) << std::endl; @@ -186,29 +187,32 @@ Please implement the member functions `start()` and `parse_request`. Enable serv template void start_server(SERVER_TYPE &server) { - // process GET request for /match/[digit+numbers], e.g. GET request is /match/abc123, will return abc123 + // process GET request for /match/[digit+numbers], e.g. + // GET request is /match/abc123, will return abc123 server.resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { string number=request.path_match[1]; - response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number; + response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() + << "\r\n\r\n" << number; }; // peocess default GET request; anonymous function will be called if no other matches // response files in folder web/ // default: index.html - server.default_resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { - string filename = "www/"; - - string path = request.path_match[1]; - - // forbidden use `..` access content outside folder web/ - size_t last_pos = path.rfind("."); - size_t current_pos = 0; - size_t pos; - while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) { - current_pos = pos; - path.erase(pos, 1); - last_pos--; - } + server.default_resource["fill_your_reg_ex"]["GET"] = + [](ostream& response, Request& request) { + string filename = "www/"; + + string path = request.path_match[1]; + + // forbidden use `..` access content outside folder web/ + size_t last_pos = path.rfind("."); + size_t current_pos = 0; + size_t pos; + while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) { + current_pos = pos; + path.erase(pos, 1); + last_pos--; + } // (...) }; From aca2d372d73bcb2486958b463599362208abdace Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=B0=AD=E4=B9=9D=E9=BC=8E?= <109224573@qq.com> Date: Mon, 28 Feb 2022 17:00:16 +0800 Subject: [PATCH 44/77] book: use https for urls (#223) --- README-zh-cn.md | 4 ++-- README.md | 2 +- book/en-us/00-preface.md | 2 +- book/en-us/01-intro.md | 2 +- book/en-us/02-usability.md | 4 ++-- book/en-us/03-runtime.md | 2 +- book/en-us/04-containers.md | 2 +- book/en-us/05-pointers.md | 4 ++-- book/en-us/06-regex.md | 6 +++--- book/en-us/07-thread.md | 4 ++-- book/en-us/08-filesystem.md | 2 +- book/en-us/09-others.md | 2 +- book/en-us/10-cpp20.md | 4 ++-- book/en-us/appendix1.md | 4 ++-- book/en-us/appendix2.md | 2 +- book/en-us/toc.md | 2 +- book/zh-cn/00-preface.md | 4 ++-- book/zh-cn/01-intro.md | 8 ++++---- book/zh-cn/02-usability.md | 6 +++--- book/zh-cn/03-runtime.md | 4 ++-- book/zh-cn/04-containers.md | 4 ++-- book/zh-cn/05-pointers.md | 6 +++--- book/zh-cn/06-regex.md | 8 ++++---- book/zh-cn/07-thread.md | 6 +++--- book/zh-cn/08-filesystem.md | 4 ++-- book/zh-cn/09-others.md | 4 ++-- book/zh-cn/10-cpp20.md | 6 +++--- book/zh-cn/appendix1.md | 6 +++--- book/zh-cn/appendix2.md | 4 ++-- book/zh-cn/toc.md | 4 ++-- pdf/en-us/meta/template.tex | 2 +- pdf/zh-cn/meta/template.tex | 2 +- website/src/modern-cpp/about/copyright.md | 4 ++-- website/themes/moderncpp/layout/index.ejs | 4 ++-- website/themes/moderncpp/layout/page.ejs | 4 ++-- 35 files changed, 69 insertions(+), 69 deletions(-) diff --git a/README-zh-cn.md b/README-zh-cn.md index 1b0aef83..4b06afa7 100644 --- a/README-zh-cn.md +++ b/README-zh-cn.md @@ -59,6 +59,6 @@ $ make build ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](./LICENSE)。 +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](./LICENSE)。 diff --git a/README.md b/README.md index 537b6adb..45df2bec 100644 --- a/README.md +++ b/README.md @@ -65,4 +65,4 @@ The author is grateful to all contributors, including but not limited to [Contri ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](./LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](./LICENSE). diff --git a/book/en-us/00-preface.md b/book/en-us/00-preface.md index 067cf0ea..b93705a3 100644 --- a/book/en-us/00-preface.md +++ b/book/en-us/00-preface.md @@ -49,4 +49,4 @@ There are few exercises At the end of each chapter of the book. It is for testin ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/01-intro.md b/book/en-us/01-intro.md index e31087bb..0b203dda 100644 --- a/book/en-us/01-intro.md +++ b/book/en-us/01-intro.md @@ -146,4 +146,4 @@ Don't worry at the moment, we will come to meet them in our later chapters. ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 2153b32e..ee908378 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -485,7 +485,7 @@ R add(T x, U y) { } ``` -> Note: There is no difference between typename and class in the template parameter list. Before the keyword typename appears, class is used to define the template parameters. However, when defining a variable with [nested dependency type](http://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names) in the template, you need to use typename to eliminate ambiguity. +> Note: There is no difference between typename and class in the template parameter list. Before the keyword typename appears, class is used to define the template parameters. However, when defining a variable with [nested dependency type](https://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names) in the template, you need to use typename to eliminate ambiguity. Such code is very ugly because the programmer must explicitly indicate the return type when using this template function. @@ -1106,4 +1106,4 @@ This section introduces the enhancements to language usability in modern C++, wh ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 878c127c..d75f1bc4 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -637,4 +637,4 @@ Lambda expression ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/04-containers.md b/book/en-us/04-containers.md index 96842464..fe1d5300 100644 --- a/book/en-us/04-containers.md +++ b/book/en-us/04-containers.md @@ -305,4 +305,4 @@ Although `std::tuple` is effective, the standard library provides limited functi ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index fca5ce77..38c167cc 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -202,8 +202,8 @@ The technology of smart pointers is not novel. It is a common technology in many ## Further Readings -- [Why does C++11 have `make_shared` but not `make_unique`](http://stackoverflow.com/questions/12580432/why-does-c11-have-make-shared-but-not-make-unique) +- [Why does C++11 have `make_shared` but not `make_unique`](https://stackoverflow.com/questions/12580432/why-does-c11-have-make-shared-but-not-make-unique) ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index 6d4f47c8..dd2963fb 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -227,9 +227,9 @@ An suggested solution can be found [here](../../exercises/6). ## Further Readings -1. [Comments from `std::regex`'s author](http://zhihu.com/question/23070203/answer/84248248) -2. [Library document of Regular Expression](http://en.cppreference.com/w/cpp/regex) +1. [Comments from `std::regex`'s author](https://zhihu.com/question/23070203/answer/84248248) +2. [Library document of Regular Expression](https://en.cppreference.com/w/cpp/regex) ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 7f2d85fb..8c5d0333 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -545,9 +545,9 @@ They provide a critical foundation for standardized high-performance computing f ## Further Readings - [C++ Concurrency in Action](https://www.amazon.com/dp/1617294691/ref=cm_sw_em_r_mt_dp_U_siEmDbRMMF960) -- [Thread document](http://en.cppreference.com/w/cpp/thread) +- [Thread document](https://en.cppreference.com/w/cpp/thread) - Herlihy, M. P., & Wing, J. M. (1990). Linearizability: a correctness condition for concurrent objects. ACM Transactions on Programming Languages and Systems, 12(3), 463–492. https://doi.org/10.1145/78969.78972 ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE).` +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE).` diff --git a/book/en-us/08-filesystem.md b/book/en-us/08-filesystem.md index 078cd76c..10085030 100644 --- a/book/en-us/08-filesystem.md +++ b/book/en-us/08-filesystem.md @@ -27,4 +27,4 @@ TODO: ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file diff --git a/book/en-us/09-others.md b/book/en-us/09-others.md index 9db078ef..773a9612 100644 --- a/book/en-us/09-others.md +++ b/book/en-us/09-others.md @@ -203,4 +203,4 @@ effective Let the compiler optimize our code to the maximum extent possible. ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/10-cpp20.md b/book/en-us/10-cpp20.md index 8988edf3..04c69ee1 100644 --- a/book/en-us/10-cpp20.md +++ b/book/en-us/10-cpp20.md @@ -94,9 +94,9 @@ This is still full of charm for a programming language that is already in its th ## Further Readings - [Why Concepts didn't make C++17？](http://honermann.net/blog/2016/03/06/why-concepts-didnt-make-cxx17/) -- [C++11/14/17/20 Compiler Support](http://en.cppreference.com/w/cpp/compiler_support) +- [C++11/14/17/20 Compiler Support](https://en.cppreference.com/w/cpp/compiler_support) - [C++ History](https://en.cppreference.com/w/cpp/language/history) ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). diff --git a/book/en-us/appendix1.md b/book/en-us/appendix1.md index dd17766b..cfde041c 100644 --- a/book/en-us/appendix1.md +++ b/book/en-us/appendix1.md @@ -10,7 +10,7 @@ First of all, congratulations 🎉 on reading this book! I hope this book has ra As mentioned in the introduction to this book, this book is just a book that takes you quickly to the new features of modern C++ 11/14/17/20, rather than the advanced learning practice of C++ "Black Magic". The author of course also thinks about this demand, but the content is very difficult and there are few audiences. Here, the author lists some materials that can help you learn more about modern C++ based on this book. I hope I can help you: -- [C++ Reference](http://en.cppreference.com/w) +- [C++ Reference](https://en.cppreference.com/w) - [CppCon YouTube Channel](https://www.youtube.com/user/CppCon/videos) - [Ulrich Drepper. What Every Programmer Should Know About Memory. 2007](https://people.freebsd.org/~lstewart/articles/cpumemory.pdf) - to be added @@ -19,4 +19,4 @@ As mentioned in the introduction to this book, this book is just a book that tak ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file diff --git a/book/en-us/appendix2.md b/book/en-us/appendix2.md index 8d377b9c..aa1053e9 100644 --- a/book/en-us/appendix2.md +++ b/book/en-us/appendix2.md @@ -36,4 +36,4 @@ TODO: ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file diff --git a/book/en-us/toc.md b/book/en-us/toc.md index 89607e0a..2f03b307 100644 --- a/book/en-us/toc.md +++ b/book/en-us/toc.md @@ -109,4 +109,4 @@ Table of Content | Last Chapter | [Next Chapter: Preface](./00-preface.md) ## Licenses -Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file +Creative Commons License
      This work was written by [Ou Changkun](https://changkun.de) and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. The code of this repository is open sourced under the [MIT license](../../LICENSE). \ No newline at end of file diff --git a/book/zh-cn/00-preface.md b/book/zh-cn/00-preface.md index a60a0ef6..ec04257d 100644 --- a/book/zh-cn/00-preface.md +++ b/book/zh-cn/00-preface.md @@ -46,6 +46,6 @@ C++17 则是近三年依赖 C++ 社区一致推进的方向，也指出了 **现 ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/01-intro.md b/book/zh-cn/01-intro.md index 80e324c1..a74a3724 100644 --- a/book/zh-cn/01-intro.md +++ b/book/zh-cn/01-intro.md @@ -138,12 +138,12 @@ clean: ## 进一步阅读的参考文献 - [C++ 语言导学. Bjarne Stroustrup](https://www.amazon.cn/dp/B00WUBYBYS/ref=sr_1_1?ie=UTF8&qid=1522400738&sr=8-1&keywords=C%2B%2B+%E8%AF%AD%E8%A8%80%E5%AF%BC%E5%AD%A6) -- [C++ 历史](http://en.cppreference.com/w/cpp/language/history) -- [C++ 特性在 GCC/Clang 等编译器中的支持情况](http://en.cppreference.com/w/cpp/compiler_support) +- [C++ 历史](https://en.cppreference.com/w/cpp/language/history) +- [C++ 特性在 GCC/Clang 等编译器中的支持情况](https://en.cppreference.com/w/cpp/compiler_support) - [C++98 与 C99 之间的区别](http://david.tribble.com/text/cdiffs.htm#C99-vs-CPP98) ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index b4710e2d..a12bacb4 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -417,7 +417,7 @@ R add(T x, U y) { } ``` -> 注意：typename 和 class 在模板参数列表中没有区别，在 typename 这个关键字出现之前，都是使用 class 来定义模板参数的。但在模板中定义有[嵌套依赖类型](http://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names)的变量时，需要用 typename 消除歧义 +> 注意：typename 和 class 在模板参数列表中没有区别，在 typename 这个关键字出现之前，都是使用 class 来定义模板参数的。但在模板中定义有[嵌套依赖类型](https://en.cppreference.com/w/cpp/language/dependent_name#The_typename_disambiguator_for_dependent_names)的变量时，需要用 typename 消除歧义 这样的代码其实变得很丑陋，因为程序员在使用这个模板函数的时候，必须明确指出返回类型。但事实上我们并不知道 `add()` 这个函数会做什么样的操作，以及获得一个什么样的返回类型。 @@ -1019,6 +1019,6 @@ std::cout << new_enum::value3 << std::endl ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index e2855df9..857d8adc 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -567,6 +567,6 @@ constexpr _Tp&& forward(typename std::remove_reference<_Tp>::type&& __t) noexcep ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/04-containers.md b/book/zh-cn/04-containers.md index d39205db..e3aded40 100644 --- a/book/zh-cn/04-containers.md +++ b/book/zh-cn/04-containers.md @@ -305,6 +305,6 @@ for(int i = 0; i != tuple_len(new_tuple); ++i) ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index bdfaf595..08dc48b8 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -183,10 +183,10 @@ int main() { ## 进一步阅读的参考资料 -1. [stackoverflow 上关于『C++11为什么没有 make_unique』的讨论](http://stackoverflow.com/questions/12580432/why-does-c11-have-make-shared-but-not-make-unique) +1. [stackoverflow 上关于『C++11为什么没有 make_unique』的讨论](https://stackoverflow.com/questions/12580432/why-does-c11-have-make-shared-but-not-make-unique) ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/06-regex.md b/book/zh-cn/06-regex.md index 65647575..b24da50b 100644 --- a/book/zh-cn/06-regex.md +++ b/book/zh-cn/06-regex.md @@ -230,11 +230,11 @@ void start_server(SERVER_TYPE &server) { ## 进一步阅读的参考资料 -1. [知乎『如何评价 GCC 的 C++11 正则表达式？』中原库作者 Tim Shen 的回答](http://zhihu.com/question/23070203/answer/84248248) -2. [正则表达式库文档](http://en.cppreference.com/w/cpp/regex) +1. [知乎『如何评价 GCC 的 C++11 正则表达式？』中原库作者 Tim Shen 的回答](https://zhihu.com/question/23070203/answer/84248248) +2. [正则表达式库文档](https://en.cppreference.com/w/cpp/regex) ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index e4982040..6a402bc9 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -554,11 +554,11 @@ C++11 语言层提供了并发编程的相关支持，本节简单的介绍了 ` ## 进一步阅读的参考资料 - [C++ 并发编程\(中文版\)](https://www.gitbook.com/book/chenxiaowei/cpp_concurrency_in_action/details) -- [线程支持库文档](http://en.cppreference.com/w/cpp/thread) +- [线程支持库文档](https://en.cppreference.com/w/cpp/thread) - Herlihy, M. P., & Wing, J. M. (1990). Linearizability: a correctness condition for concurrent objects. ACM Transactions on Programming Languages and Systems, 12(3), 463–492. https://doi.org/10.1145/78969.78972 ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/08-filesystem.md b/book/zh-cn/08-filesystem.md index 050a6167..be60a5a2 100644 --- a/book/zh-cn/08-filesystem.md +++ b/book/zh-cn/08-filesystem.md @@ -22,6 +22,6 @@ TODO: ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/09-others.md b/book/zh-cn/09-others.md index fe9d7c59..8dc1861e 100644 --- a/book/zh-cn/09-others.md +++ b/book/zh-cn/09-others.md @@ -187,6 +187,6 @@ int main() { ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/book/zh-cn/10-cpp20.md b/book/zh-cn/10-cpp20.md index df09348d..c1a4f6a0 100644 --- a/book/zh-cn/10-cpp20.md +++ b/book/zh-cn/10-cpp20.md @@ -89,11 +89,11 @@ TODO: ## 进一步阅读的参考资料 - [Why Concepts didn't make C++17？](http://honermann.net/blog/2016/03/06/why-concepts-didnt-make-cxx17/) -- [C++11/14/17/20 编译器支持情况](http://en.cppreference.com/w/cpp/compiler_support) +- [C++11/14/17/20 编译器支持情况](https://en.cppreference.com/w/cpp/compiler_support) - [C++ 历史](https://en.cppreference.com/w/cpp/language/history) ## 许可 -知识共享许可协议 +知识共享许可协议 -本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file +本教程由[欧长坤](https://github.com/changkun)撰写，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file diff --git a/book/zh-cn/appendix1.md b/book/zh-cn/appendix1.md index fbc6a2f1..e0a32d6c 100644 --- a/book/zh-cn/appendix1.md +++ b/book/zh-cn/appendix1.md @@ -10,7 +10,7 @@ order: 11 正如本书引言部分提到的，本书只是一本带你快速领略现代 C++ 11/14/17/20 新特性的读物，而非进阶学习实践 C++『黑魔法』的内容。笔者当然也想到了这个需求，只是这样的内容非常艰深，鲜有受众。在此，笔者列出一些能够帮助你在此书基础之上进一步学习现代 C++ 的资料，希望能够祝你一臂之力： -- [C++ 参考](http://en.cppreference.com/w) +- [C++ 参考](https://en.cppreference.com/w) - [CppCon YouTube 频道](https://www.youtube.com/user/CppCon/videos) - [Ulrich Drepper. 每位程序员都需要知道的内存知识. 2007](https://people.freebsd.org/~lstewart/articles/cpumemory.pdf) - 待补充 @@ -19,6 +19,6 @@ order: 11 ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file diff --git a/book/zh-cn/appendix2.md b/book/zh-cn/appendix2.md index 6fce2b02..bf8e907f 100644 --- a/book/zh-cn/appendix2.md +++ b/book/zh-cn/appendix2.md @@ -36,6 +36,6 @@ TODO: ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 \ No newline at end of file diff --git a/book/zh-cn/toc.md b/book/zh-cn/toc.md index 5a444896..fa2cbd9b 100644 --- a/book/zh-cn/toc.md +++ b/book/zh-cn/toc.md @@ -109,6 +109,6 @@ ## 许可 -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../../LICENSE)。 diff --git a/pdf/en-us/meta/template.tex b/pdf/en-us/meta/template.tex index 380f6195..bd22952d 100644 --- a/pdf/en-us/meta/template.tex +++ b/pdf/en-us/meta/template.tex @@ -172,7 +172,7 @@ \vspace{1em} \textbf{\large License} - \noindent This work was written by \href{https://github.com/changkun}{Ou Changkun} and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. \texttt{\small http://creativecommons.org/licenses/by-nc-nd/4.0/} + \noindent This work was written by \href{https://github.com/changkun}{Ou Changkun} and licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. \texttt{\small https://creativecommons.org/licenses/by-nc-nd/4.0/} \vspace{5em} \includegraphics{../../assets/cover-2nd-en} diff --git a/pdf/zh-cn/meta/template.tex b/pdf/zh-cn/meta/template.tex index 69f60116..9288c338 100644 --- a/pdf/zh-cn/meta/template.tex +++ b/pdf/zh-cn/meta/template.tex @@ -179,7 +179,7 @@ \vspace{1em} \textbf{\large 版权声明} - \noindent 本书系\href{https://github.com/changkun}{欧长坤}著，采用“知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议 (cc by-nc-sa)”进行许可。\texttt{\small http://creativecommons.org/licenses/by-nc-nd/4.0/} + \noindent 本书系\href{https://github.com/changkun}{欧长坤}著，采用“知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议 (cc by-nc-sa)”进行许可。\texttt{\small https://creativecommons.org/licenses/by-nc-nd/4.0/} \vspace{7em} \includegraphics{../../assets/cover-2nd} diff --git a/website/src/modern-cpp/about/copyright.md b/website/src/modern-cpp/about/copyright.md index c63c60e5..b065dc43 100755 --- a/website/src/modern-cpp/about/copyright.md +++ b/website/src/modern-cpp/about/copyright.md @@ -4,6 +4,6 @@ type: about order: 3 --- -知识共享许可协议 +知识共享许可协议 -本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 [MIT](https://opensource.org/licenses/MIT) 协议开源。 \ No newline at end of file +本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 [MIT](https://opensource.org/licenses/MIT) 协议开源。 \ No newline at end of file diff --git a/website/themes/moderncpp/layout/index.ejs b/website/themes/moderncpp/layout/index.ejs index 0dbd3cd9..f5677d0f 100755 --- a/website/themes/moderncpp/layout/index.ejs +++ b/website/themes/moderncpp/layout/index.ejs @@ -51,11 +51,11 @@ diff --git a/website/themes/moderncpp/layout/page.ejs b/website/themes/moderncpp/layout/page.ejs index 15616e53..29209a2b 100755 --- a/website/themes/moderncpp/layout/page.ejs +++ b/website/themes/moderncpp/layout/page.ejs @@ -26,7 +26,7 @@

      Changkun Ou © 2016-<%- new Date().getFullYear() %>. - The book is licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0, code is open sourced under the MIT License. + The book is licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0, code is open sourced under the MIT License.

      If you like the book, you could donate the author. @@ -36,7 +36,7 @@

      欧长坤 © 2016-<%- new Date().getFullYear() %> 版权所有， - 采用知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议许可，代码使用 MIT 协议开源。 + 采用知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议许可，代码使用 MIT 协议开源。

      如果你认为本书对你起到了帮助，可以资助作者。 From e276dac7d1896f3745a73141bbe8f69e2331bb11 Mon Sep 17 00:00:00 2001 From: ambiguoustexture <59325440+ambiguoustexture@users.noreply.github.com> Date: Tue, 1 Mar 2022 22:59:05 +0800 Subject: [PATCH 45/77] book: re-compose words to avoid out of pdf's margin (#229) --- book/en-us/04-containers.md | 2 +- book/zh-cn/04-containers.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/04-containers.md b/book/en-us/04-containers.md index fe1d5300..36acbb3b 100644 --- a/book/en-us/04-containers.md +++ b/book/en-us/04-containers.md @@ -118,7 +118,7 @@ And select the appropriate location to insert into the container. When traversin The elements in the unordered container are not sorted, and the internals is implemented by the Hash table. The average complexity of inserting and searching for elements is `O(constant)`, Significant performance gains can be achieved without concern for the order of the elements inside the container. -C++11 introduces two sets of unordered containers: `std::unordered_map`/`std::unordered_multimap` and +C++11 introduces two unordered containers: `std::unordered_map`/`std::unordered_multimap` and `std::unordered_set`/`std::unordered_multiset`. Their usage is basically similar to the original `std::map`/`std::multimap`/`std::set`/`set::multiset` diff --git a/book/zh-cn/04-containers.md b/book/zh-cn/04-containers.md index e3aded40..b884ffda 100644 --- a/book/zh-cn/04-containers.md +++ b/book/zh-cn/04-containers.md @@ -115,7 +115,7 @@ std::sort(arr.begin(), arr.end()); 而无序容器中的元素是不进行排序的，内部通过 Hash 表实现，插入和搜索元素的平均复杂度为 `O(constant)`， 在不关心容器内部元素顺序时，能够获得显著的性能提升。 -C++11 引入了两组无序容器：`std::unordered_map`/`std::unordered_multimap` 和 +C++11 引入了的两组无序容器分别是：`std::unordered_map`/`std::unordered_multimap` 和 `std::unordered_set`/`std::unordered_multiset`。 它们的用法和原有的 `std::map`/`std::multimap`/`std::set`/`set::multiset` 基本类似， From 80db4e3d4aed1fc64c0a4c7d65060cb594de2116 Mon Sep 17 00:00:00 2001 From: ambiguoustexture <59325440+ambiguoustexture@users.noreply.github.com> Date: Sat, 5 Mar 2022 23:24:52 +0800 Subject: [PATCH 46/77] book: re-compose words again to avoid out of pdf's margin (#230) --- book/zh-cn/05-pointers.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index 08dc48b8..b88428a9 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -19,7 +19,7 @@ order: 5 也就是我们常说的 RAII 资源获取即初始化技术。 凡事都有例外，我们总会有需要将对象在自由存储上分配的需求，在传统 C++ 里我们只好使用 `new` 和 `delete` 去 -『记得』对资源进行释放。而 C++11 引入了智能指针的概念，使用了引用计数的想法，让程序员不再需要关心手动释放内存。 +『记得』对资源进行释放。而 C++11 引入智能指针的概念，使用引用计数的想法，让程序员不再需要关心手动释放内存。 这些智能指针就包括 `std::shared_ptr`/`std::unique_ptr`/`std::weak_ptr`，使用它们需要包含头文件 ``。 > 注意：引用计数不是垃圾回收，引用计数能够尽快收回不再被使用的对象，同时在回收的过程中也不会造成长时间的等待， From b5f594023949745651a1d6808b77722bedd77937 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sat, 26 Mar 2022 14:00:23 +0100 Subject: [PATCH 47/77] pdf: use correct license Fixes #232 --- pdf/zh-cn/meta/template.tex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pdf/zh-cn/meta/template.tex b/pdf/zh-cn/meta/template.tex index 9288c338..956270f6 100644 --- a/pdf/zh-cn/meta/template.tex +++ b/pdf/zh-cn/meta/template.tex @@ -179,7 +179,7 @@ \vspace{1em} \textbf{\large 版权声明} - \noindent 本书系\href{https://github.com/changkun}{欧长坤}著，采用“知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议 (cc by-nc-sa)”进行许可。\texttt{\small https://creativecommons.org/licenses/by-nc-nd/4.0/} + \noindent 本书系\href{https://github.com/changkun}{欧长坤}著，采用“知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议 (CC BY-NC-ND)”进行许可。\texttt{\small https://creativecommons.org/licenses/by-nc-nd/4.0/} \vspace{7em} \includegraphics{../../assets/cover-2nd} From cfda52200adfbf8de1e867b520b2fee009392a96 Mon Sep 17 00:00:00 2001 From: Augus <34206897+DrAugus@users.noreply.github.com> Date: Fri, 6 May 2022 22:16:04 +0800 Subject: [PATCH 48/77] book: fix indent (#236) --- book/zh-cn/03-runtime.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 857d8adc..c43ab0f4 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -397,8 +397,8 @@ int main() { int main() { -std::string str = "Hello world."; -std::vector v; + std::string str = "Hello world."; + std::vector v; // 将使用 push_back(const T&), 即产生拷贝行为 v.push_back(str); From 4dfd34e8a003789445c0d8aa2908f55425de30dc Mon Sep 17 00:00:00 2001 From: Lukas Prokop Date: Tue, 12 Jul 2022 08:40:48 +0200 Subject: [PATCH 49/77] =?UTF-8?q?book:=20=E2=80=9Cnon-linear=E2=80=9D=20sh?= =?UTF-8?q?ould=20be=20=E2=80=9Cnon-constant=E2=80=9D=20(#241)?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit There is no notion of linearity in this book. However, the context makes it clear that non-constant values are meant. --- book/en-us/03-runtime.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index d75f1bc4..969e6a91 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -374,7 +374,7 @@ int main() { } ``` -The first question, why not allow non-linear references to bind to non-lvalues? +The first question, why not allow non-constant references to bind to non-lvalues? This is because there is a logic error in this approach: ```cpp From 66d33aa2f47ab29cbdd096bde18eec53db0da084 Mon Sep 17 00:00:00 2001 From: Ofey Chan Date: Sun, 17 Jul 2022 03:38:11 -0700 Subject: [PATCH 50/77] book: markdown style fixes (#243) --- book/en-us/03-runtime.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 969e6a91..e1ddd42b 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -529,7 +529,7 @@ both lvalue and rvalue. But follow the rules below: | T&& | rvalue ref | T&& | Therefore, the use of `T&&` in a template function may not be able to make an rvalue reference, and when a lvalue is passed, a reference to this function will be derived as an lvalue. -More precisely, ** no matter what type of reference the template parameter is, the template parameter can be derived as a right reference type** if and only if the argument type is a right reference. +More precisely, **no matter what type of reference the template parameter is, the template parameter can be derived as a right reference type** if and only if the argument type is a right reference. This makes `v` successful delivery of lvalues. Perfect forwarding is based on the above rules. The so-called perfect forwarding is to let us pass the parameters, @@ -586,7 +586,7 @@ static_cast param passing: lvalue reference Regardless of whether the pass parameter is an lvalue or an rvalue, the normal pass argument will forward the argument as an lvalue. So `std::move` will always accept an lvalue, which forwards the call to `reference(int&&)` to output the rvalue reference. -Only `std::forward` does not cause any extra copies and ** perfectly forwards ** (passes) the arguments of the function to other functions that are called internally. +Only `std::forward` does not cause any extra copies and **perfectly forwards** (passes) the arguments of the function to other functions that are called internally. `std::forward` is the same as `std::move`, and nothing is done. `std::move` simply converts the lvalue to the rvalue. `std::forward` is just a simple conversion of the parameters. From the point of view of the phenomenon, From 97b6cc75f7a01bc148f51bd3aad0ff4d0e9717cb Mon Sep 17 00:00:00 2001 From: Lukas Prokop Date: Sun, 17 Jul 2022 12:38:57 +0200 Subject: [PATCH 51/77] book: typo fixes (#240) --- book/en-us/03-runtime.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index e1ddd42b..35e2252c 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -339,7 +339,7 @@ void reference(std::string&& str) { int main() { std::string lv1 = "string,"; // lv1 is a lvalue - // std::string&& r1 = s1; // illegal, rvalue can't ref to lvalue + // std::string&& r1 = lv1; // illegal, rvalue can't ref to lvalue std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue std::cout << rv1 << std::endl; // string, From dd7b707acf711fa453838538e77ee75e0fbb8a2d Mon Sep 17 00:00:00 2001 From: gliangbupt Date: Sun, 17 Jul 2022 18:42:17 +0800 Subject: [PATCH 52/77] book: add missing header file (#233) --- book/en-us/02-usability.md | 2 ++ book/zh-cn/02-usability.md | 2 ++ 2 files changed, 4 insertions(+) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index ee908378..79a754f2 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -285,6 +285,8 @@ such as: ```cpp #include #include +#include + class MagicFoo { public: std::vector vec; diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index a12bacb4..8b1731c5 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -233,6 +233,8 @@ int main() { ```cpp #include #include +#include + class MagicFoo { public: std::vector vec; From 0616cb816dc9885e46e58f31f87459ea803ea23c Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sun, 17 Jul 2022 12:44:21 +0200 Subject: [PATCH 53/77] book: markdown style fixes Fixes #235 --- book/zh-cn/03-runtime.md | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index c43ab0f4..a6610dab 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -69,7 +69,7 @@ void lambda_reference_capture() { #### 3. 隐式捕获 -手动书写捕获列表有时候是非常复杂的，这种机械性的工作可以交给编译器来处理，这时候可以在捕获列表中写一个 +手动书写捕获列表有时候是非常复杂的，这种机械性的工作可以交给编译器来处理，这时候可以在捕获列表中写一个 `&` 或 `=` 向编译器声明采用引用捕获或者值捕获. 总结一下，捕获提供了 Lambda 表达式对外部值进行使用的功能，捕获列表的最常用的四种形式可以是： @@ -213,14 +213,14 @@ int main() { 要弄明白右值引用到底是怎么一回事，必须要对左值和右值做一个明确的理解。 -**左值(lvalue, left value)**，顾名思义就是赋值符号左边的值。准确来说， +**左值** (lvalue, left value)，顾名思义就是赋值符号左边的值。准确来说， 左值是表达式（不一定是赋值表达式）后依然存在的持久对象。 -**右值(rvalue, right value)**，右边的值，是指表达式结束后就不再存在的临时对象。 +**右值** (rvalue, right value)，右边的值，是指表达式结束后就不再存在的临时对象。 而 C++11 中为了引入强大的右值引用，将右值的概念进行了进一步的划分，分为：纯右值、将亡值。 -**纯右值(prvalue, pure rvalue)**，纯粹的右值，要么是纯粹的字面量，例如 `10`, `true`； +**纯右值** (prvalue, pure rvalue)，纯粹的右值，要么是纯粹的字面量，例如 `10`, `true`； 要么是求值结果相当于字面量或匿名临时对象，例如 `1+2`。非引用返回的临时变量、运算表达式产生的临时变量、 原始字面量、Lambda 表达式都属于纯右值。 @@ -232,7 +232,7 @@ class Foo { public: void bar() { right = "still rvalue"; // 此处字符串字面量为右值 - } + } }; int main() { @@ -352,19 +352,19 @@ void foo() { class A { public: int *pointer; - A():pointer(new int(1)) { - std::cout << "构造" << pointer << std::endl; + A():pointer(new int(1)) { + std::cout << "构造" << pointer << std::endl; } - A(A& a):pointer(new int(*a.pointer)) { - std::cout << "拷贝" << pointer << std::endl; + A(A& a):pointer(new int(*a.pointer)) { + std::cout << "拷贝" << pointer << std::endl; } // 无意义的对象拷贝 - A(A&& a):pointer(a.pointer) { + A(A&& a):pointer(a.pointer) { a.pointer = nullptr; - std::cout << "移动" << pointer << std::endl; + std::cout << "移动" << pointer << std::endl; } - ~A(){ - std::cout << "析构" << pointer << std::endl; - delete pointer; + ~A(){ + std::cout << "析构" << pointer << std::endl; + delete pointer; } }; // 防止编译器优化 From d740ee8b7c1494689867cbb52df6a5a4ee2bd0b7 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sun, 17 Jul 2022 12:47:50 +0200 Subject: [PATCH 54/77] book: reword for latex style fixes Fixes #227 --- book/en-us/06-regex.md | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index dd2963fb..d927d226 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -34,7 +34,7 @@ and lowercase letters, all numbers, all punctuation, and some other symbols. A special character is a character with special meaning in a regular expression and is also the core matching syntax of a regular expression. See the table below: -| Special characters | Description | +| Symbol | Description | | :----------------: | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `$` | Matches the end position of the input string. | | `(`,`)` | Marks the start and end of a subexpression. Subexpressions can be obtained for later use. | @@ -52,7 +52,7 @@ A special character is a character with special meaning in a regular expression The qualifier is used to specify how many times a given component of a regular expression must appear to satisfy the match. See the table below: -| Character | Description | +| Symbol | Description | | :-------: | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `*` | matches the previous subexpression zero or more times. For example, `foo*` matches `fo` and `foooo`. `*` is equivalent to `{0,}`. | | `+` | matches the previous subexpression one or more times. For example, `foo+` matches `foo` and `foooo` but does not match `fo`. `+` is equivalent to `{1,}`. | @@ -84,7 +84,7 @@ We use a simple example to briefly introduce the use of this library. Consider t int main() { std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"}; - // In C++, `\` will be used as an escape character in the string. In order for `\.` + // In C++, `\` will be used as an escape character in the string. In order for `\.` // to be passed as a regular expression, it is necessary to perform second escaping of `\`, thus we have `\\.` std::regex txt_regex("[a-z]+\\.txt"); for (const auto &fname: fnames) @@ -187,18 +187,18 @@ Please implement the member functions `start()` and `parse_request`. Enable serv template void start_server(SERVER_TYPE &server) { - // process GET request for /match/[digit+numbers], e.g. + // process GET request for /match/[digit+numbers], e.g. // GET request is /match/abc123, will return abc123 server.resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { string number=request.path_match[1]; - response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() + response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number; }; // peocess default GET request; anonymous function will be called if no other matches // response files in folder web/ // default: index.html - server.default_resource["fill_your_reg_ex"]["GET"] = + server.default_resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { string filename = "www/"; From b22404503e6459df049410dae232231d81f179e5 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sun, 17 Jul 2022 12:51:14 +0200 Subject: [PATCH 55/77] book: use compact table Updates #227 --- book/en-us/06-regex.md | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index d927d226..1ac999ee 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -34,32 +34,32 @@ and lowercase letters, all numbers, all punctuation, and some other symbols. A special character is a character with special meaning in a regular expression and is also the core matching syntax of a regular expression. See the table below: -| Symbol | Description | -| :----------------: | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -| `$` | Matches the end position of the input string. | -| `(`,`)` | Marks the start and end of a subexpression. Subexpressions can be obtained for later use. | -| `*` | Matches the previous subexpression zero or more times. | -| `+` | Matches the previous subexpression one or more times. | -| `.` | Matches any single character except the newline character `\n`. | -| `[` | Marks the beginning of a bracket expression. | -| `?` | Matches the previous subexpression zero or one time, or indicates a non-greedy qualifier. | -| `\` | Marks the next character as either a special character, or a literal character, or a backward reference, or an octal escape character. For example, `n` Matches the character `n`. `\n` matches newline characters. The sequence `\\` Matches the `'\'` character, while `\(` matches the `'('` character. | -| `^` | Matches the beginning of the input string, unless it is used in a square bracket expression, at which point it indicates that the set of characters is not accepted. | -| `{` | Marks the beginning of a qualifier expression. | -| `\|` | Indicates a choice between the two. | +| Symbol | Description | +|:----------------:|:---| +| `$` | Matches the end position of the input string.| +| `(`,`)` | Marks the start and end of a subexpression. Subexpressions can be obtained for later use.| +| `*` | Matches the previous subexpression zero or more times. | +| `+` | Matches the previous subexpression one or more times.| +| `.` | Matches any single character except the newline character `\n`.| +| `[` | Marks the beginning of a bracket expression.| +| `?` | Matches the previous subexpression zero or one time, or indicates a non-greedy qualifier.| +| `\` | Marks the next character as either a special character, or a literal character, or a backward reference, or an octal escape character. For example, `n` Matches the character `n`. `\n` matches newline characters. The sequence `\\` Matches the `'\'` character, while `\(` matches the `'('` character. | +| `^` | Matches the beginning of the input string, unless it is used in a square bracket expression, at which point it indicates that the set of characters is not accepted.| +| `{` | Marks the beginning of a qualifier expression.| +| `\|` | Indicates a choice between the two.| ### Quantifiers The qualifier is used to specify how many times a given component of a regular expression must appear to satisfy the match. See the table below: -| Symbol | Description | -| :-------: | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -| `*` | matches the previous subexpression zero or more times. For example, `foo*` matches `fo` and `foooo`. `*` is equivalent to `{0,}`. | -| `+` | matches the previous subexpression one or more times. For example, `foo+` matches `foo` and `foooo` but does not match `fo`. `+` is equivalent to `{1,}`. | -| `?` | matches the previous subexpression zero or one time. For example, `Your(s)?` can match `Your` in `Your` or `Yours`. `?` is equivalent to `{0,1}`. | -| `{n}` | `n` is a non-negative integer. Matches the determined `n` times. For example, `o{2}` cannot match `o` in `for`, but can match two `o` in `foo`. | -| `{n,}` | `n` is a non-negative integer. Match at least `n` times. For example, `o{2,}` cannot match `o` in `for`, but matches all `o` in `foooooo`. `o{1,}` is equivalent to `o+`. `o{0,}` is equivalent to `o*`. | -| `{n,m}` | `m` and `n` are non-negative integers, where `n` is less than or equal to `m`. Matches at least `n` times and matches up to `m` times. For example, `o{1,3}` will match the first three `o` in `foooooo`. `o{0,1}` is equivalent to `o?`. Note that there can be no spaces between the comma and the two numbers. | +| Symbol | Description | +|:-------:|:-----| +| `*` | matches the previous subexpression zero or more times. For example, `foo*` matches `fo` and `foooo`. `*` is equivalent to `{0,}`.| +| `+` | matches the previous subexpression one or more times. For example, `foo+` matches `foo` and `foooo` but does not match `fo`. `+` is equivalent to `{1,}`.| +| `?` | matches the previous subexpression zero or one time. For example, `Your(s)?` can match `Your` in `Your` or `Yours`. `?` is equivalent to `{0,1}`.| +| `{n}` | `n` is a non-negative integer. Matches the determined `n` times. For example, `o{2}` cannot match `o` in `for`, but can match two `o` in `foo`.| +| `{n,}` | `n` is a non-negative integer. Match at least `n` times. For example, `o{2,}` cannot match `o` in `for`, but matches all `o` in `foooooo`. `o{1,}` is equivalent to `o+`. `o{0,}` is equivalent to `o*`.| +| `{n,m}` | `m` and `n` are non-negative integers, where `n` is less than or equal to `m`. Matches at least `n` times and matches up to `m` times. For example, `o{1,3}` will match the first three `o` in `foooooo`. `o{0,1}` is equivalent to `o?`. Note that there can be no spaces between the comma and the two numbers. | With these two tables, we can usually read almost all regular expressions. From 25a8fd2bc4056f7e35d32e97b2363bc335b4d859 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sun, 17 Jul 2022 12:56:56 +0200 Subject: [PATCH 56/77] book: fix incorrect suggestions Fixes #239 --- book/en-us/07-thread.md | 4 ++-- book/zh-cn/07-thread.md | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 8c5d0333..359c6cb3 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -468,7 +468,7 @@ To achieve the ultimate performance and achieve consistency of various strength As you can see, `std::memory_order_release` ensures that a write before a release does not occur after the release operation, which is a **backward barrier**, and `std::memory_order_acquire` ensures that a subsequent read or write after a acquire does not occur before the acquire operation, which is a **forward barrier**. For the `std::memory_order_acq_rel` option, combines the characteristics of the two barriers and determines a unique memory barrier, such that reads and writes of the current thread will not be rearranged across the barrier. - + Let's check an example: ```cpp @@ -495,7 +495,7 @@ To achieve the ultimate performance and achieve consistency of various strength acquire.join(); ``` - In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`, but in most cases, `compare_exchange_strong` should be limited. + In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`. However, in most cases, `compare_exchange_weak` is discouraged due to the complexity of its usage. 4. Sequential Consistent Model: Under this model, atomic operations satisfy sequence consistency, which in turn can cause performance loss. It can be specified explicitly by `std::memory_order_seq_cst`. Let's look at a final example: diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index 6a402bc9..ea99ed09 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -260,7 +260,7 @@ int main() { } ``` -从直观上看，`t2` 中 `a = 5;` 这一条语句似乎总在 `flag = 1;` 之前得到执行，而 `t1` 中 `while (flag != 1)` +从直观上看，`t2` 中 `a = 5;` 这一条语句似乎总在 `flag = 1;` 之前得到执行，而 `t1` 中 `while (flag != 1)` 似乎保证了 `std::cout << "b = " << b << std::endl;` 不会再标记被改变前执行。从逻辑上看，似乎 `b` 的值应该等于 5。 但实际情况远比此复杂得多，或者说这段代码本身属于未定义的行为，因为对于 `a` 和 `flag` 而言，他们在两个并行的线程中被读写， 出现了竞争。除此之外，即便我们忽略竞争读写，仍然可能受 CPU 的乱序执行，编译器对指令的重排的影响， @@ -408,7 +408,7 @@ int main() { y.load() c = a + b x.store(3) ``` - 上面给出的三种例子都是属于因果一致的，因为整个过程中，只有 `c` 对 `a` 和 `b` 产生依赖，而 `x` 和 `y` + 上面给出的三种例子都是属于因果一致的，因为整个过程中，只有 `c` 对 `a` 和 `b` 产生依赖，而 `x` 和 `y` 在此例子中表现为没有关系（但实际情况中我们需要更详细的信息才能确定 `x` 与 `y` 确实无关） 4. 最终一致性：是最弱的一致性要求，它只保障某个操作在未来的某个时间节点上会被观察到，但并未要求被观察到的时间。因此我们甚至可以对此条件稍作加强，例如规定某个操作被观察到的时间总是有界的。当然这已经不在我们的讨论范围之内了。 @@ -504,7 +504,7 @@ int main() { acquire.join(); ``` - 在此例中我们使用了 `compare_exchange_strong`，它便是比较交换原语（Compare-and-swap primitive），它有一个更弱的版本，即 `compare_exchange_weak`，它允许即便交换成功，也仍然返回 `false` 失败。其原因是因为在某些平台上虚假故障导致的，具体而言，当 CPU 进行上下文切换时，另一线程加载同一地址产生的不一致。除此之外，`compare_exchange_strong` 的性能可能稍差于 `compare_exchange_weak`，但大部分情况下，`compare_exchange_strong` 应该被有限考虑。 + 在此例中我们使用了 `compare_exchange_strong` 比较交换原语（Compare-and-swap primitive），它有一个更弱的版本，即 `compare_exchange_weak`，它允许即便交换成功，也仍然返回 `false` 失败。其原因是因为在某些平台上虚假故障导致的，具体而言，当 CPU 进行上下文切换时，另一线程加载同一地址产生的不一致。除此之外，`compare_exchange_strong` 的性能可能稍差于 `compare_exchange_weak`，但大部分情况下，鉴于其使用的复杂度而言，`compare_exchange_weak` 应该被有限考虑。 4. 顺序一致模型：在此模型下，原子操作满足顺序一致性，进而可能对性能产生损耗。可显式的通过 `std::memory_order_seq_cst` 进行指定。最后来看一个例子： From 41b88c861e757aa4ad5cf93fd3829678ef09f39e Mon Sep 17 00:00:00 2001 From: Timothy Liu Date: Sun, 17 Jul 2022 19:18:50 +0800 Subject: [PATCH 57/77] book: redo string literal explanation (#237) --- book/en-us/03-runtime.md | 30 +++++++++++++++++++++--------- book/zh-cn/03-runtime.md | 28 +++++++++++++++++++--------- 2 files changed, 40 insertions(+), 18 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 35e2252c..e12e6086 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -263,22 +263,34 @@ Temporary variables returned by non-references, temporary variables generated by operation expressions, original literals, and Lambda expressions are all pure rvalue values. -Note that a string literal became rvalue in a class, and remains an lvalue in other cases (e.g., in a function)： +Note that a literal (except a string literal) is a prvalue. However, a string +literal is an lvalue with type `const char` array. Consider the following examples: ```cpp -class Foo { - const char*&& right = "this is a rvalue"; -public: - void bar() { - right = "still rvalue"; // the string literal is a rvalue - } -}; +#include int main() { - const char* const &left = "this is an lvalue"; // the string literal is an lvalue + // Correct. The type of "01234" is const char [6], so it is an lvalue + const char (&left)[6] = "01234"; + + // Assert success. It is a const char [6] indeed. Note that decltype(expr) + // yields lvalue reference if expr is an lvalue and neither an unparenthesized + // id-expression nor an unparenthesized class member access expression. + static_assert(std::is_same::value, ""); + + // Error. "01234" is an lvalue, which cannot be referenced by an rvalue reference + // const char (&&right)[6] = "01234"; } ``` +However, an array can be implicitly converted to a corresponding pointer.The result, if not an lvalue reference, is an rvalue (xvalue if the result is an rvalue reference, prvalue otherwise): + +```cpp +const char* p = "01234"; // Correct. "01234" is implicitly converted to const char* +const char*&& pr = "01234"; // Correct. "01234" is implicitly converted to const char*, which is a prvalue. +// const char*& pl = "01234"; // Error. There is no type const char* lvalue +``` + **xvalue, expiring value** is the concept proposed by C++11 to introduce rvalue references (so in traditional C++, pure rvalue and rvalue are the same concepts), a value that is destroyed but can be moved. diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index a6610dab..10f82cad 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -224,22 +224,32 @@ int main() { 要么是求值结果相当于字面量或匿名临时对象，例如 `1+2`。非引用返回的临时变量、运算表达式产生的临时变量、 原始字面量、Lambda 表达式都属于纯右值。 -需要注意的是，字符串字面量只有在类中才是右值，当其位于普通函数中是左值。例如： +需要注意的是，字面量除了字符串字面量以外，均为纯右值。而字符串字面量是一个左值，类型为 `const char` 数组。例如： ```cpp -class Foo { - const char*&& right = "this is a rvalue"; // 此处字符串字面量为右值 -public: - void bar() { - right = "still rvalue"; // 此处字符串字面量为右值 - } -}; +#include int main() { - const char* const &left = "this is an lvalue"; // 此处字符串字面量为左值 + // 正确，"01234" 类型为 const char [6]，因此是左值 + const char (&left)[6] = "01234"; + + // 断言正确，确实是 const char [6] 类型，注意 decltype(expr) 在 expr 是左值 + // 且非无括号包裹的 id 表达式与类成员表达式时，会返回左值引用 + static_assert(std::is_same::value, ""); + + // 错误，"01234" 是左值，不可被右值引用 + // const char (&&right)[6] = "01234"; } ``` +但是注意，数组可以被隐式转换成相对应的指针类型，而转换表达式的结果（如果不是左值引用）则一定是个右值（右值引用为将亡值，否则为纯右值）。例如： + +```cpp +const char* p = "01234"; // 正确，"01234" 被隐式转换为 const char* +const char*&& pr = "01234"; // 正确，"01234" 被隐式转换为 const char*，该转换的结果是纯右值 +// const char*& pl = "01234"; // 错误，此处不存在 const char* 类型的左值 +``` + **将亡值(xvalue, expiring value)**，是 C++11 为了引入右值引用而提出的概念（因此在传统 C++ 中， 纯右值和右值是同一个概念），也就是即将被销毁、却能够被移动的值。 From e50e3c64f26aa1801b3ca42629915603e9128cac Mon Sep 17 00:00:00 2001 From: ReEcho <59325440+ambiguoustexture@users.noreply.github.com> Date: Sun, 17 Jul 2022 19:29:30 +0800 Subject: [PATCH 58/77] book: formatting style updates (#231) --- book/en-us/02-usability.md | 6 +++-- book/en-us/03-runtime.md | 12 +++++---- book/en-us/05-pointers.md | 14 +++++------ book/en-us/06-regex.md | 50 +++++++++++++++++++++----------------- book/en-us/07-thread.md | 18 ++++++++------ book/zh-cn/02-usability.md | 9 ++++--- book/zh-cn/03-runtime.md | 7 +++--- book/zh-cn/05-pointers.md | 20 ++++++++------- book/zh-cn/06-regex.md | 24 ++++++++++++------ book/zh-cn/07-thread.md | 22 +++++++++-------- 10 files changed, 106 insertions(+), 76 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 79a754f2..619b49b0 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -214,7 +214,8 @@ int main() { } // should output: 1, 4, 3, 4. can be simplified using `auto` - for (std::vector::iterator element = vec.begin(); element != vec.end(); ++element) + for (std::vector::iterator element = vec.begin(); element != vec.end(); + ++element) std::cout << *element << std::endl; } ``` @@ -301,7 +302,8 @@ int main() { MagicFoo magicFoo = {1, 2, 3, 4, 5}; std::cout << "magicFoo: "; - for (std::vector::iterator it = magicFoo.vec.begin(); it != magicFoo.vec.end(); ++it) + for (std::vector::iterator it = magicFoo.vec.begin(); + it != magicFoo.vec.end(); ++it) std::cout << *it << std::endl; } ``` diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index e12e6086..8c7c145e 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -221,8 +221,8 @@ int foo(int a, int b, int c) { ; } int main() { - // bind parameter 1, 2 on function foo, and use std::placeholders::_1 as placeholder - // for the first parameter. + // bind parameter 1, 2 on function foo, + // and use std::placeholders::_1 as placeholder for the first parameter. auto bindFoo = std::bind(foo, std::placeholders::_1, 1,2); // when call bindFoo, we only need one param left bindFoo(1); @@ -355,7 +355,8 @@ int main() std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue std::cout << rv1 << std::endl; // string, - const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can extend temp variable's lifecycle + const std::string& lv2 = lv1 + lv1; // legal, const lvalue reference can + // extend temp variable's lifecycle // lv2 += "Test"; // illegal, const ref can't be modified std::cout << lv2 << std::endl; // string,string, @@ -482,8 +483,9 @@ int main() { // "str: Hello world." std::cout << "str: " << str << std::endl; - // use push_back(const T&&), no copy - // the string will be moved to vector, and therefore std::move can reduce copy cost + // use push_back(const T&&), + // no copy the string will be moved to vector, + // and therefore std::move can reduce copy cost v.push_back(std::move(str)); // str is empty now std::cout << "str: " << str << std::endl; diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md index 38c167cc..dab6df95 100644 --- a/book/en-us/05-pointers.md +++ b/book/en-us/05-pointers.md @@ -57,27 +57,27 @@ And see the reference count of an object by `use_count()`. E.g: auto pointer = std::make_shared(10); auto pointer2 = pointer; // reference count+1 auto pointer3 = pointer; // reference count+1 -int *p = pointer.get(); // no increase of reference count +int *p = pointer.get(); // no increase of reference count -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 3 std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 3 pointer2.reset(); std::cout << "reset pointer2:" << std::endl; -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 std::cout << "pointer2.use_count() = " - << pointer2.use_count() << std::endl; // 0, pointer2 has reset + << pointer2.use_count() << std::endl; // pointer2 has reset, 0 std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 2 pointer3.reset(); std::cout << "reset pointer3:" << std::endl; -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1 +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0 std::cout << "pointer3.use_count() = " - << pointer3.use_count() << std::endl; // 0, pointer3 has reset + << pointer3.use_count() << std::endl; // pointer3 has reset, 0 ``` ## 5.3 `std::unique_ptr` @@ -85,7 +85,7 @@ std::cout << "pointer3.use_count() = " `std::unique_ptr` is an exclusive smart pointer that prohibits other smart pointers from sharing the same object, thus keeping the code safe: ```cpp -std::unique_ptr pointer = std::make_unique(10); // make_unique was introduced in C++14 +std::unique_ptr pointer = std::make_unique(10); // make_unique, from C++14 std::unique_ptr pointer2 = pointer; // illegal ``` diff --git a/book/en-us/06-regex.md b/book/en-us/06-regex.md index 1ac999ee..e8b98547 100644 --- a/book/en-us/06-regex.md +++ b/book/en-us/06-regex.md @@ -84,8 +84,9 @@ We use a simple example to briefly introduce the use of this library. Consider t int main() { std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"}; - // In C++, `\` will be used as an escape character in the string. In order for `\.` - // to be passed as a regular expression, it is necessary to perform second escaping of `\`, thus we have `\\.` + // In C++, `\` will be used as an escape character in the string. + // In order for `\.` to be passed as a regular expression, + // it is necessary to perform second escaping of `\`, thus we have `\\.` std::regex txt_regex("[a-z]+\\.txt"); for (const auto &fname: fnames) std::cout << fname << ": " << std::regex_match(fname, txt_regex) << std::endl; @@ -104,7 +105,8 @@ std::smatch base_match; for(const auto &fname: fnames) { if (std::regex_match(fname, base_match, base_regex)) { // the first element of std::smatch matches the entire string - // the second element of std::smatch matches the first expression with brackets + // the second element of std::smatch matches the first expression + // with brackets if (base_match.size() == 2) { std::string base = base_match[1].str(); std::cout << "sub-match[0]: " << base_match[0].str() << std::endl; @@ -187,32 +189,36 @@ Please implement the member functions `start()` and `parse_request`. Enable serv template void start_server(SERVER_TYPE &server) { - // process GET request for /match/[digit+numbers], e.g. - // GET request is /match/abc123, will return abc123 - server.resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { + // process GET request for /match/[digit+numbers], + // e.g. GET request is /match/abc123, will return abc123 + server.resource["fill_your_reg_ex"]["GET"] = + [](ostream& response, Request& request) + { string number=request.path_match[1]; response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number; }; - // peocess default GET request; anonymous function will be called if no other matches - // response files in folder web/ + // peocess default GET request; + // anonymous function will be called + // if no other matches response files in folder web/ // default: index.html server.default_resource["fill_your_reg_ex"]["GET"] = - [](ostream& response, Request& request) { - string filename = "www/"; - - string path = request.path_match[1]; - - // forbidden use `..` access content outside folder web/ - size_t last_pos = path.rfind("."); - size_t current_pos = 0; - size_t pos; - while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) { - current_pos = pos; - path.erase(pos, 1); - last_pos--; - } + [](ostream& response, Request& request) + { + string filename = "www/"; + + string path = request.path_match[1]; + + // forbidden use `..` access content outside folder web/ + size_t last_pos = path.rfind("."); + size_t current_pos = 0; + size_t pos; + while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) { + current_pos = pos; + path.erase(pos, 1); + last_pos--; + } // (...) }; diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 359c6cb3..379d4d2a 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -145,7 +145,8 @@ int main() { std::cout << "waiting..."; result.wait(); // block until future has arrived // output result - std::cout << "done!" << std:: endl << "future result is " << result.get() << std::endl; + std::cout << "done!" << std:: endl << "future result is " + << result.get() << std::endl; return 0; } ``` @@ -196,7 +197,8 @@ int main() { // temporal unlock to allow producer produces more rather than // let consumer hold the lock until its consumed. lock.unlock(); - std::this_thread::sleep_for(std::chrono::milliseconds(1000)); // consumer is slower + // consumer is slower + std::this_thread::sleep_for(std::chrono::milliseconds(1000)); lock.lock(); if (!produced_nums.empty()) { std::cout << "consuming " << produced_nums.front() << std::endl; @@ -272,7 +274,7 @@ This is a very strong set of synchronization conditions, in other words when it This seems too harsh for a variable that requires only atomic operations (no intermediate state). The research on synchronization conditions has a very long history, and we will not go into details here. Readers should understand that under the modern CPU architecture, atomic operations at the CPU instruction level are provided. -Therefore, in the C++11 multi-threaded shared variable reading and writing, the introduction of the `std::atomic` template, so that we instantiate an atomic type, will be a +Therefore, in the C++11 multi-threaded shared variable reading and writing, the introduction of the `std::atomic` template, so that we instantiate an atomic type, will be an Atomic type read and write operations are minimized from a set of instructions to a single CPU instruction. E.g: ```cpp @@ -417,8 +419,11 @@ Weakening the synchronization conditions between processes, usually we will cons ``` 3 4 4 4 // The write operation of x was quickly observed 0 3 3 4 // There is a delay in the observed time of the x write operation - 0 0 0 4 // The last read read the final value of x, but the previous changes were not observed. - 0 0 0 0 // The write operation of x is not observed in the current time period, but the situation that x is 4 can be observed at some point in the future. + 0 0 0 4 // The last read read the final value of x, + // but the previous changes were not observed. + 0 0 0 0 // The write operation of x is not observed in the current time period, + // but the situation that x is 4 can be observed + // at some point in the future. ``` ### Memory Orders @@ -480,9 +485,8 @@ To achieve the ultimate performance and achieve consistency of various strength }); std::thread acqrel([&]() { int expected = 1; // must before compare_exchange_strong - while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) { + while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) expected = 1; // must after compare_exchange_strong - } // flag has changed to 2 }); std::thread acquire([&]() { diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 8b1731c5..51a8b0d1 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -176,7 +176,8 @@ int main() { } // 将输出 1, 4, 3, 4 - for (std::vector::iterator element = vec.begin(); element != vec.end(); ++element) + for (std::vector::iterator element = vec.begin(); element != vec.end(); + ++element) std::cout << *element << std::endl; } ``` @@ -228,7 +229,7 @@ int main() { } ``` -为了解决这个问题，C++11 首先把初始化列表的概念绑定到了类型上，并将其称之为 `std::initializer_list`，允许构造函数或其他函数像参数一样使用初始化列表，这就为类对象的初始化与普通数组和 POD 的初始化方法提供了统一的桥梁，例如： +为解决这个问题，C++11 首先把初始化列表的概念绑定到类型上，称其为 `std::initializer_list`，允许构造函数或其他函数像参数一样使用初始化列表，这就为类对象的初始化与普通数组和 POD 的初始化方法提供了统一的桥梁，例如： ```cpp #include @@ -249,7 +250,9 @@ int main() { MagicFoo magicFoo = {1, 2, 3, 4, 5}; std::cout << "magicFoo: "; - for (std::vector::iterator it = magicFoo.vec.begin(); it != magicFoo.vec.end(); ++it) std::cout << *it << std::endl; + for (std::vector::iterator it = magicFoo.vec.begin(); + it != magicFoo.vec.end(); ++it) + std::cout << *it << std::endl; } ``` diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 10f82cad..57839baf 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -136,7 +136,7 @@ Lambda 表达式的本质是一个和函数对象类型相似的类类型（称 #include using foo = void(int); // 定义函数类型, using 的使用见上一节中的别名语法 -void functional(foo f) { // 定义在参数列表中的函数类型 foo 被视为退化后的函数指针类型 foo* +void functional(foo f) { // 参数列表中定义的函数类型 foo 被视为退化后的函数指针类型 foo* f(1); // 通过函数指针调用函数 } @@ -193,7 +193,8 @@ int foo(int a, int b, int c) { ; } int main() { - // 将参数1,2绑定到函数 foo 上，但是使用 std::placeholders::_1 来对第一个参数进行占位 + // 将参数1,2绑定到函数 foo 上， + // 但使用 std::placeholders::_1 来对第一个参数进行占位 auto bindFoo = std::bind(foo, std::placeholders::_1, 1,2); // 这时调用 bindFoo 时，只需要提供第一个参数即可 bindFoo(1); @@ -551,7 +552,7 @@ constexpr _Tp&& forward(typename std::remove_reference<_Tp>::type&& __t) noexcep ``` 在这份实现中，`std::remove_reference` 的功能是消除类型中的引用， -而 `std::is_lvalue_reference` 用于检查类型推导是否正确，在 `std::forward` 的第二个实现中 +`std::is_lvalue_reference` 则用于检查类型推导是否正确，在 `std::forward` 的第二个实现中 检查了接收到的值确实是一个左值，进而体现了坍缩规则。 当 `std::forward` 接受左值时，`_Tp` 被推导为左值，所以返回值为左值；而当其接受右值时， diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md index b88428a9..ef7467f7 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -19,15 +19,15 @@ order: 5 也就是我们常说的 RAII 资源获取即初始化技术。 凡事都有例外，我们总会有需要将对象在自由存储上分配的需求，在传统 C++ 里我们只好使用 `new` 和 `delete` 去 -『记得』对资源进行释放。而 C++11 引入智能指针的概念，使用引用计数的想法，让程序员不再需要关心手动释放内存。 -这些智能指针就包括 `std::shared_ptr`/`std::unique_ptr`/`std::weak_ptr`，使用它们需要包含头文件 ``。 +『记得』对资源进行释放。而 C++11 引入了智能指针的概念，使用了引用计数的想法，让程序员不再需要关心手动释放内存。 +这些智能指针包括 `std::shared_ptr`/`std::unique_ptr`/`std::weak_ptr`，使用它们需要包含头文件 ``。 > 注意：引用计数不是垃圾回收，引用计数能够尽快收回不再被使用的对象，同时在回收的过程中也不会造成长时间的等待， > 更能够清晰明确的表明资源的生命周期。 ## 5.2 `std::shared_ptr` -`std::shared_ptr` 是一种智能指针，它能够记录多少个 `shared_ptr` 共同指向一个对象，从而消除显式的调用 +`std::shared_ptr` 是一种智能指针，它能够记录多少个 `shared_ptr` 共同指向一个对象，从而消除显式的调用 `delete`，当引用计数变为零的时候就会将对象自动删除。 但还不够，因为使用 `std::shared_ptr` 仍然需要使用 `new` 来调用，这使得代码出现了某种程度上的不对称。 @@ -59,21 +59,23 @@ int main() { auto pointer = std::make_shared(10); auto pointer2 = pointer; // 引用计数+1 auto pointer3 = pointer; // 引用计数+1 -int *p = pointer.get(); // 这样不会增加引用计数 -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 +int *p = pointer.get(); // 这样不会增加引用计数 +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 3 std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 3 pointer2.reset(); std::cout << "reset pointer2:" << std::endl; -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 -std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0, pointer2 已 reset +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 +std::cout << "pointer2.use_count() = " + << pointer2.use_count() << std::endl; // pointer2 已 reset; 0 std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 2 pointer3.reset(); std::cout << "reset pointer3:" << std::endl; -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1 +std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1 std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0 -std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 0, pointer3 已 reset +std::cout << "pointer3.use_count() = " + << pointer3.use_count() << std::endl; // pointer3 已 reset; 0 ``` ## 5.3 `std::unique_ptr` diff --git a/book/zh-cn/06-regex.md b/book/zh-cn/06-regex.md index b24da50b..a4c6597e 100644 --- a/book/zh-cn/06-regex.md +++ b/book/zh-cn/06-regex.md @@ -94,7 +94,8 @@ C++11 提供的正则表达式库操作 `std::string` 对象， int main() { std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"}; - // 在 C++ 中 \ 会被作为字符串内的转义符，为使 \. 作为正则表达式传递进去生效，需要对 \ 进行二次转义，从而有 \\. + // 在 C++ 中 \ 会被作为字符串内的转义符， + // 为使 \. 作为正则表达式传递进去生效，需要对 \ 进行二次转义，从而有 \\. std::regex txt_regex("[a-z]+\\.txt"); for (const auto &fname: fnames) std::cout << fname << ": " << std::regex_match(fname, txt_regex) << std::endl; @@ -103,7 +104,7 @@ int main() { 另一种常用的形式就是依次传入 `std::string`/`std::smatch`/`std::regex` 三个参数， 其中 `std::smatch` 的本质其实是 `std::match_results`。 -在标准库中， `std::smatch` 被定义为了 `std::match_results`， +故而在标准库的实现中， `std::smatch` 被定义为了 `std::match_results`， 也就是一个子串迭代器类型的 `match_results`。 使用 `std::smatch` 可以方便的对匹配的结果进行获取，例如： @@ -193,16 +194,23 @@ protected: template void start_server(SERVER_TYPE &server) { - // process GET request for /match/[digit+numbers], e.g. GET request is /match/abc123, will return abc123 - server.resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { + // process GET request for /match/[digit+numbers], + // e.g. GET request is /match/abc123, will return abc123 + server.resource["fill_your_reg_ex"]["GET"] = + [](ostream& response, Request& request) + { string number=request.path_match[1]; - response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number; + response << "HTTP/1.1 200 OK\r\nContent-Length: " + << number.length() << "\r\n\r\n" << number; }; - // peocess default GET request; anonymous function will be called if no other matches - // response files in folder web/ + // peocess default GET request; + // anonymous function will be called + // if no other matches response files in folder web/ // default: index.html - server.default_resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) { + server.default_resource["fill_your_reg_ex"]["GET"] = + [](ostream& response, Request& request) + { string filename = "www/"; string path = request.path_match[1]; diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index ea99ed09..d6b08fd1 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -70,7 +70,7 @@ int main() { 由于 C++ 保证了所有栈对象在生命周期结束时会被销毁，所以这样的代码也是异常安全的。 无论 `critical_section()` 正常返回、还是在中途抛出异常，都会引发堆栈回退，也就自动调用了 `unlock()`。 -而 `std::unique_lock` 则相对于 `std::lock_guard` 出现的，`std::unique_lock` 更加灵活， +而 `std::unique_lock` 则是相对于 `std::lock_guard` 出现的，`std::unique_lock` 更加灵活， `std::unique_lock` 的对象会以独占所有权（没有其他的 `unique_lock` 对象同时拥有某个 `mutex` 对象的所有权） 的方式管理 `mutex` 对象上的上锁和解锁的操作。所以在并发编程中，推荐使用 `std::unique_lock`。 @@ -147,7 +147,8 @@ int main() { std::cout << "waiting..."; result.wait(); // 在此设置屏障，阻塞到期物的完成 // 输出执行结果 - std::cout << "done!" << std:: endl << "future result is " << result.get() << std::endl; + std::cout << "done!" << std:: endl << "future result is " + << result.get() << std::endl; return 0; } ``` @@ -198,7 +199,8 @@ int main() { } // 短暂取消锁，使得生产者有机会在消费者消费空前继续生产 lock.unlock(); - std::this_thread::sleep_for(std::chrono::milliseconds(1000)); // 消费者慢于生产者 + // 消费者慢于生产者 + std::this_thread::sleep_for(std::chrono::milliseconds(1000)); lock.lock(); while (!produced_nums.empty()) { std::cout << "consuming " << produced_nums.front() << std::endl; @@ -277,7 +279,7 @@ int main() { 这是一组非常强的同步条件，换句话说当最终编译为 CPU 指令时会表现为非常多的指令（我们之后再来看如何实现一个简单的互斥锁）。 这对于一个仅需原子级操作（没有中间态）的变量，似乎太苛刻了。 -关于同步条件的研究有着非常久远的历史，我们在这里不进行赘述。读者应该明白，在现代 CPU 体系结构下提供了 CPU 指令级的原子操作， +关于同步条件的研究有着非常久远的历史，我们在这里不进行赘述。读者应该明白，现代 CPU 体系结构提供了 CPU 指令级的原子操作， 因此在 C++11 中多线程下共享变量的读写这一问题上，还引入了 `std::atomic` 模板，使得我们实例化一个原子类型，将一个 原子类型读写操作从一组指令，最小化到单个 CPU 指令。例如： @@ -311,7 +313,7 @@ int main() { } ``` -当然，并非所有的类型都能提供原子操作，这是因为原子操作的可行性取决于 CPU 的架构以及所实例化的类型结构是否满足该架构对内存对齐 +当然，并非所有的类型都能提供原子操作，这是因为原子操作的可行性取决于具体的 CPU 架构，以及所实例化的类型结构是否能够满足该 CPU 架构对内存对齐 条件的要求，因而我们总是可以通过 `std::atomic::is_lock_free` 来检查该原子类型是否需支持原子操作，例如： ```cpp @@ -419,7 +421,7 @@ int main() { T2 ---------+------------+--------------------+--------+--------> - x.read() x.read() x.read() x.read() + x.read x.read() x.read() x.read() ``` 在上面的情况中，如果我们假设 x 的初始值为 0，则 `T2` 中四次 `x.read()` 结果可能但不限于以下情况： @@ -428,7 +430,8 @@ int main() { 3 4 4 4 // x 的写操作被很快观察到 0 3 3 4 // x 的写操作被观察到的时间存在一定延迟 0 0 0 4 // 最后一次读操作读到了 x 的最终值，但此前的变化并未观察到 - 0 0 0 0 // 在当前时间段内 x 的写操作均未被观察到，但未来某个时间点上一定能观察到 x 为 4 的情况 + 0 0 0 0 // 在当前时间段内 x 的写操作均未被观察到， + // 但未来某个时间点上一定能观察到 x 为 4 的情况 ``` ### 内存顺序 @@ -489,9 +492,8 @@ int main() { }); std::thread acqrel([&]() { int expected = 1; // must before compare_exchange_strong - while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) { + while(!flag.compare_exchange_strong(expected, 2, std::memory_order_acq_rel)) expected = 1; // must after compare_exchange_strong - } // flag has changed to 2 }); std::thread acquire([&]() { @@ -553,7 +555,7 @@ C++11 语言层提供了并发编程的相关支持，本节简单的介绍了 ` ## 进一步阅读的参考资料 -- [C++ 并发编程\(中文版\)](https://www.gitbook.com/book/chenxiaowei/cpp_concurrency_in_action/details) +- [C++ 并发编程\(中文版\)](https://book.douban.com/subject/26386925/) - [线程支持库文档](https://en.cppreference.com/w/cpp/thread) - Herlihy, M. P., & Wing, J. M. (1990). Linearizability: a correctness condition for concurrent objects. ACM Transactions on Programming Languages and Systems, 12(3), 463–492. https://doi.org/10.1145/78969.78972 From 2e9eed9ecc4f855684be1e475e73e7c120979935 Mon Sep 17 00:00:00 2001 From: Changkun Ou Date: Sun, 17 Jul 2022 15:08:18 +0200 Subject: [PATCH 59/77] book: reword generic lambda Fixes #242 --- book/en-us/03-runtime.md | 16 ++++++---------- book/zh-cn/03-runtime.md | 8 +++----- 2 files changed, 9 insertions(+), 15 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index 8c7c145e..a61d6654 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -126,13 +126,9 @@ initialize it in the expression. In the previous section, we mentioned that the `auto` keyword cannot be used in the parameter list because it would conflict with the functionality of the template. -But Lambda expressions are not ordinary functions, so Lambda expressions are not templated. -This has caused us some trouble: the parameter table cannot be generalized, -and the parameter table type must be clarified. - -Fortunately, this trouble only exists in C++11, starting with C++14. -The formal parameters of the Lambda function can use the `auto` keyword -to generate generic meanings: +But lambda expressions are not regular functions, without further specification on the typed parameter list, lambda expressions cannot utilize templates. Fortunately, this trouble +only exists in C++11, starting with C++14. The formal parameters of the lambda function +can use the `auto` keyword to utilize template generics: ```cpp void lambda_generic() { @@ -221,7 +217,7 @@ int foo(int a, int b, int c) { ; } int main() { - // bind parameter 1, 2 on function foo, + // bind parameter 1, 2 on function foo, // and use std::placeholders::_1 as placeholder for the first parameter. auto bindFoo = std::bind(foo, std::placeholders::_1, 1,2); // when call bindFoo, we only need one param left @@ -483,8 +479,8 @@ int main() { // "str: Hello world." std::cout << "str: " << str << std::endl; - // use push_back(const T&&), - // no copy the string will be moved to vector, + // use push_back(const T&&), + // no copy the string will be moved to vector, // and therefore std::move can reduce copy cost v.push_back(std::move(str)); // str is empty now diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 57839baf..a8ce6d85 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -107,11 +107,9 @@ void lambda_expression_capture() { ### 泛型 Lambda 上一节中我们提到了 `auto` 关键字不能够用在参数表里，这是因为这样的写法会与模板的功能产生冲突。 -但是 Lambda 表达式并不是普通函数，所以 Lambda 表达式并不能够模板化。 -这就为我们造成了一定程度上的麻烦：参数表不能够泛化，必须明确参数表类型。 - -幸运的是，这种麻烦只存在于 C++11 中，从 C++14 开始， -Lambda 函数的形式参数可以使用 `auto` 关键字来产生意义上的泛型： +但是 Lambda 表达式并不是普通函数，所以在没有明确指明参数表类型的情况下，Lambda 表达式并不能够模板化。 +幸运的是，这种麻烦只存在于 C++11 中，从 C++14 开始，Lambda 函数的形式参数可以使用 `auto` +关键字来产生意义上的泛型： ```cpp auto add = [](auto x, auto y) { From 237c9905102af6ee2c059ac7f56211a898e94067 Mon Sep 17 00:00:00 2001 From: ALAN <48608756+AlanHN@users.noreply.github.com> Date: Sat, 20 Aug 2022 15:24:36 +0800 Subject: [PATCH 60/77] book: typo fixes (#248) --- book/en-us/02-usability.md | 4 ++-- book/zh-cn/02-usability.md | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 619b49b0..19eb4a30 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -378,8 +378,8 @@ One of the most common and notable examples of type derivation using `auto` is t ```cpp // before C++11 // cbegin() returns vector::const_iterator -// and therefore itr is type vector::const_iterator -for(vector::const_iterator it = vec.cbegin(); itr != vec.cend(); ++it) +// and therefore it is type vector::const_iterator +for(vector::const_iterator it = vec.cbegin(); it != vec.cend(); ++it) ``` When we have `auto`: diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 51a8b0d1..5f0105b0 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -314,8 +314,8 @@ C++11 引入了 `auto` 和 `decltype` 这两个关键字实现了类型推导， ```cpp // 在 C++11 之前 // 由于 cbegin() 将返回 vector::const_iterator -// 所以 itr 也应该是 vector::const_iterator 类型 -for(vector::const_iterator it = vec.cbegin(); itr != vec.cend(); ++it) +// 所以 it 也应该是 vector::const_iterator 类型 +for(vector::const_iterator it = vec.cbegin(); it != vec.cend(); ++it) ``` 而有了 `auto` 之后可以： From 8182184f2aee5091b8791ba5a1549c3df380c41d Mon Sep 17 00:00:00 2001 From: stephen9357 Date: Fri, 9 Sep 2022 02:20:43 +0800 Subject: [PATCH 61/77] book: typo fixes (#249) --- book/en-us/02-usability.md | 2 +- book/zh-cn/02-usability.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 19eb4a30..12864e0d 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -222,7 +222,7 @@ int main() { In the above code, we can see that the `itr` variable is defined in the scope of the entire `main()`, which causes us to rename the other when a variable need to traverse -the entire `std::vectors` again. C++17 eliminates this limitation so that +the entire `std::vector` again. C++17 eliminates this limitation so that we can do this in if(or switch): ```cpp diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 5f0105b0..d7193dd4 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -182,7 +182,7 @@ int main() { } ``` -在上面的代码中，我们可以看到 `itr` 这一变量是定义在整个 `main()` 的作用域内的，这导致当我们需要再次遍历整个 `std::vectors` 时，需要重新命名另一个变量。C++17 消除了这一限制，使得我们可以在 `if`（或 `switch`）中完成这一操作： +在上面的代码中，我们可以看到 `itr` 这一变量是定义在整个 `main()` 的作用域内的，这导致当我们需要再次遍历整个 `std::vector` 时，需要重新命名另一个变量。C++17 消除了这一限制，使得我们可以在 `if`（或 `switch`）中完成这一操作： ```cpp // 将临时变量放到 if 语句内 From f6538da3d67ecd951fb557b858d1e6bcae7676fa Mon Sep 17 00:00:00 2001 From: zincsamael Date: Sun, 11 Sep 2022 12:41:04 -0700 Subject: [PATCH 62/77] book: typo fixes (#250) --- book/en-us/01-intro.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/01-intro.md b/book/en-us/01-intro.md index 0b203dda..03ecd88c 100644 --- a/book/en-us/01-intro.md +++ b/book/en-us/01-intro.md @@ -43,7 +43,7 @@ Before learning modern C++, let's take a look at the main features that have dep - **C language style type conversion is deprecated (ie using `(convert_type)`) before variables, and `static_cast`, `reinterpret_cast`, `const_cast` should be used for type conversion.** -- **In particular, some of the C standard libraries that can be used are deprecated in the latest C++17 standard, such as ``, ``, `` and `` Wait** +- **In particular, some of the C standard libraries that can be used are deprecated in the latest C++17 standard, such as ``, ``, `` and `` etc.** - ... and many more From de86a78627237c24cf1b8f44f65d1fc82556cb3e Mon Sep 17 00:00:00 2001 From: Seiichi Uchida Date: Sun, 18 Sep 2022 22:55:12 +0900 Subject: [PATCH 63/77] book: typo fixes (#251) --- book/en-us/02-usability.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 12864e0d..10c13ffa 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -153,7 +153,7 @@ actually returns a constant at runtime, which causes illegal production. C++11 provides `constexpr` to let the user explicitly declare that the function or object constructor will become a constant expression at compile time. This keyword explicitly tells the compiler that it should verify that `len_foo` -should be a compile-time constant expression. Constant expression. +should be a compile-time constant expression. In addition, the function of `constexpr` can use recursion: From a1c4184b8dae37bbeaa250a5b6d996fd29772655 Mon Sep 17 00:00:00 2001 From: Yikai Cai <35102736+VVsxmja@users.noreply.github.com> Date: Tue, 6 Dec 2022 15:35:38 +0800 Subject: [PATCH 64/77] book: style fixes (#256) --- book/zh-cn/03-runtime.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index a8ce6d85..12894127 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -249,7 +249,7 @@ const char*&& pr = "01234"; // 正确，"01234" 被隐式转换为 const char* // const char*& pl = "01234"; // 错误，此处不存在 const char* 类型的左值 ``` -**将亡值(xvalue, expiring value)**，是 C++11 为了引入右值引用而提出的概念（因此在传统 C++ 中， +**将亡值** (xvalue, expiring value)，是 C++11 为了引入右值引用而提出的概念（因此在传统 C++ 中， 纯右值和右值是同一个概念），也就是即将被销毁、却能够被移动的值。 将亡值可能稍有些难以理解，我们来看这样的代码： From 4228ff2afb2b7fd829c460e2d67e084e191ec23d Mon Sep 17 00:00:00 2001 From: David Date: Fri, 30 Dec 2022 17:29:50 +0800 Subject: [PATCH 65/77] book: type fix (#257) --- book/en-us/02-usability.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 10c13ffa..3528c68a 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -548,7 +548,7 @@ std::cout << "q: " << q << std::endl; > To understand it you need to know the concept of parameter forwarding > in C++, which we will cover in detail in the -> [Language Runtime Hardening](./03-runtime.md) chapter, +> [Language Runtime Enhancements](./03-runtime.md) chapter, > and you can come back to the contents of this section later. In simple terms, `decltype(auto)` is mainly used to derive From 725df6b753b02a0bcffb52b79c52ef2bd67470c8 Mon Sep 17 00:00:00 2001 From: Guo Shuai Date: Mon, 27 Feb 2023 14:29:37 +0800 Subject: [PATCH 66/77] book: wording (#260) --- book/zh-cn/07-thread.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index d6b08fd1..8e11407d 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -11,7 +11,7 @@ order: 7 ## 7.1 并行基础 `std::thread` 用于创建一个执行的线程实例，所以它是一切并发编程的基础，使用时需要包含 `` 头文件， -它提供了很多基本的线程操作，例如 `get_id()` 来获取所创建线程的线程 ID，使用 `join()` 来加入一个线程等等，例如： +它提供了很多基本的线程操作，例如 `get_id()` 来获取所创建线程的线程 ID，使用 `join()` 来等待一个线程结束（与该线程汇合）等等，例如： ```cpp #include From eca0b923075f1e71830a55ddaadc5f8bc44d17a1 Mon Sep 17 00:00:00 2001 From: GNAQ <41422940+GNAQ@users.noreply.github.com> Date: Tue, 7 Mar 2023 17:28:52 +0800 Subject: [PATCH 67/77] book: style fixes (#261) --- book/zh-cn/00-preface.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/00-preface.md b/book/zh-cn/00-preface.md index ec04257d..5e26f70e 100644 --- a/book/zh-cn/00-preface.md +++ b/book/zh-cn/00-preface.md @@ -11,7 +11,7 @@ order: 0 ## 引言 C++ 是一个用户群体相当大的语言。从 C++98 的出现到 C++11 的正式定稿经历了长达十年多之久的积累。C++14/17 则是作为对 C++11 的重要补充和优化，C++20 则将这门语言领进了现代化的大门，所有这些新标准中扩充的特性，给 C++ 这门语言注入了新的活力。 -那些还在坚持使用**传统 C++**（本书把 C++98 及其之前的 C++ 特性均称之为传统 C++）而未接触过现代 C++ 的 C++ 程序员在见到诸如 Lambda 表达式这类全新特性时，甚至会流露出『学的不是同一门语言』的惊叹之情。 +那些还在坚持使用**传统 C++** （本书把 C++98 及其之前的 C++ 特性均称之为传统 C++）而未接触过现代 C++ 的 C++ 程序员在见到诸如 Lambda 表达式这类全新特性时，甚至会流露出『学的不是同一门语言』的惊叹之情。 **现代 C++** (本书中均指 C++11/14/17/20) 为传统 C++ 注入的大量特性使得整个 C++ 变得更加像一门现代化的语言。现代 C++ 不仅仅增强了 C++ 语言自身的可用性，`auto` 关键字语义的修改使得我们更加有信心来操控极度复杂的模板类型。同时还对语言运行期进行了大量的强化，Lambda 表达式的出现让 C++ 具有了『匿名函数』的『闭包』特性，而这一特性几乎在现代的编程语言（诸如 Python/Swift/... ）中已经司空见惯，右值引用的出现解决了 C++ 长期以来被人诟病的临时对象效率问题等等。 From e86e4a4b94b5dbc691688fa61c4264934898524b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=A5=9D=E7=8D=BB=E7=9A=84=E5=B7=B4=E5=9F=BA=E5=8A=9B?= <68413810+Valkierja@users.noreply.github.com> Date: Sun, 7 May 2023 03:17:04 +0800 Subject: [PATCH 68/77] book: typo fixes (#262) --- book/zh-cn/03-runtime.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 12894127..1760b3a8 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -523,8 +523,8 @@ static_cast 传参: 右值引用 static_cast 传参: 左值引用 ``` -无论传递参数为左值还是右值，普通传参都会将参数作为左值进行转发， -所以 `std::move` 总会接受到一个左值，从而转发调用了`reference(int&&)` 输出右值引用。 +无论传递参数为左值还是右值，普通传参都会将参数作为左值进行转发； +由于类似的原因，`std::move` 总会接受到一个左值，从而转发调用了`reference(int&&)` 输出右值引用。 唯独 `std::forward` 即没有造成任何多余的拷贝，同时**完美转发**(传递)了函数的实参给了内部调用的其他函数。 From ff6ee89e2a5b16e0ec2342a61171086187fd3a8b Mon Sep 17 00:00:00 2001 From: lingkerio whiher <112792583+lingkerio@users.noreply.github.com> Date: Sun, 7 May 2023 15:19:09 +0800 Subject: [PATCH 69/77] book: discriminative modification to the nature of override and overload (#265) --- book/en-us/02-usability.md | 2 +- book/zh-cn/02-usability.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 3528c68a..6da7d8e5 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -971,7 +971,7 @@ C++11 introduces the two keywords `override` and `final` to prevent this from ha ### override -When overriding a virtual function, introducing the `override` keyword will explicitly tell the compiler to overload, and the compiler will check if the base function has such a virtual function, otherwise it will not compile: +When overriding a virtual function, introducing the `override` keyword will explicitly tell the compiler to overload, and the compiler will check if the base function has such a virtual function with consistent function signature, otherwise it will not compile: ```cpp struct Base { diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index d7193dd4..ed4fe982 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -880,7 +880,7 @@ C++11 引入了 `override` 和 `final` 这两个关键字来防止上述情形 #### override -当重载虚函数时，引入 `override` 关键字将显式的告知编译器进行重载，编译器将检查基函数是否存在这样的虚函数，否则将无法通过编译： +当重载虚函数时，引入 `override` 关键字将显式的告知编译器进行重载，编译器将检查基函数是否存在这样的其函数签名一致的虚函数，否则将无法通过编译： ```cpp struct Base { From bdf0e899a7f9619acba31f8c5eee15bb2d6c6324 Mon Sep 17 00:00:00 2001 From: "A. Jiang" Date: Tue, 21 May 2024 05:53:15 +0800 Subject: [PATCH 70/77] book: fix imprecise description of `NULL` in C++ (#279) --- book/en-us/02-usability.md | 17 +++++++++-------- book/zh-cn/02-usability.md | 4 ++-- 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 6da7d8e5..51d3edcf 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -18,20 +18,21 @@ which refers to the language behavior that occurred before the runtime. ### nullptr -The purpose of `nullptr` appears to replace `NULL`. In a sense, -traditional C++ treats `NULL` and `0` as the same thing, -depending on how the compiler defines NULL, -and some compilers define NULL as `((void*)0)` Some will define it directly as `0`. +The purpose of `nullptr` appears to replace `NULL`. There are **null pointer constants** in the C and C++ languages, +which can be implicitly converted to null pointer value of any pointer type, +or null member pointer value of any pointer-to-member type in C++. +`NULL` is provided by the standard library implementation and defined as an implementation-defined null pointer constant. +In C, some standard libraries defines `NULL` as `((void*)0)` and some define it as `0`. -C++ **does not allow** to implicitly convert `void *` to other types. -But if the compiler tries to define `NULL` as `((void*)0)`, then in the following code: +C++ **does not allow** to implicitly convert `void *` to other types, and thus `((void*)0)` is not a valid implementation +of `NULL`. If the standard library tries to define `NULL` as `((void*)0)`, then compilation error would occur in the following code: ```cpp char *ch = NULL; ``` C++ without the `void *` implicit conversion has to define `NULL` as `0`. -This still creates a new problem. Defining `NULL` to 0 will cause the overloading feature in `C++` to be confusing. +This still creates a new problem. Defining `NULL` to `0` will cause the overloading feature in `C++` to be confusing. Consider the following two `foo` functions: ```cpp @@ -41,7 +42,7 @@ void foo(int); Then the `foo(NULL);` statement will call `foo(int)`, which will cause the code to be counterintuitive. -To solve this problem, C++11 introduced the `nullptr` keyword, which is specifically used to distinguish null pointers, 0. The type of `nullptr` is `nullptr_t`, which can be implicitly converted to any pointer or member pointer type, and can be compared equally or unequally with them. +To solve this problem, C++11 introduced the `nullptr` keyword, which is specifically used to distinguish null pointers, `0`. The type of `nullptr` is `nullptr_t`, which can be implicitly converted to any pointer or member pointer type, and can be compared equally or unequally with them. You can try to compile the following code using clang++: diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index ed4fe982..11047e7e 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -14,9 +14,9 @@ order: 2 ### nullptr -`nullptr` 出现的目的是为了替代 `NULL`。在某种意义上来说，传统 C++ 会把 `NULL`、`0` 视为同一种东西，这取决于编译器如何定义 `NULL`，有些编译器会将 `NULL` 定义为 `((void*)0)`，有些则会直接将其定义为 `0`。 +`nullptr` 出现的目的是为了替代 `NULL`。 C 与 C++ 语言中有**空指针常量**，它们能被隐式转换成任何指针类型的空指针值，或 C++ 中的任何成员指针类型的空成员指针值。 `NULL` 由标准库实现提供，并被定义为实现定义的空指针常量。在 C 中，有些标准库会把 `NULL` 定义为 `((void*)0)` 而有些将它定义为 `0`。 -C++ **不允许**直接将 `void *` 隐式转换到其他类型。但如果编译器尝试把 `NULL` 定义为 `((void*)0)`，那么在下面这句代码中： +C++ **不允许**直接将 `void *` 隐式转换到其他类型，从而 `((void*)0)` 不是 `NULL` 的合法实现。如果标准库尝试把 `NULL` 定义为 `((void*)0)`，那么下面这句代码中会出现编译错误： ```cpp char *ch = NULL; From 54e99e14617a17c7c6f9eb7936d77e449b0e20ce Mon Sep 17 00:00:00 2001 From: "A. Jiang" Date: Tue, 21 May 2024 05:54:46 +0800 Subject: [PATCH 71/77] book: avoid "let the compiler deduce the list by itself" (#277) --- book/en-us/03-runtime.md | 4 ++-- book/zh-cn/03-runtime.md | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md index a61d6654..8ecd2956 100644 --- a/book/en-us/03-runtime.md +++ b/book/en-us/03-runtime.md @@ -87,8 +87,8 @@ capture lists can be: - \[\] empty capture list - \[name1, name2, ...\] captures a series of variables -- \[&\] reference capture, let the compiler deduce the reference list by itself -- \[=\] value capture, let the compiler deduce the value list by itself +- \[&\] reference capture, determine the reference capture list from the uses the in function body +- \[=\] value capture, determine the value capture list from the uses in the function body #### 4. Expression capture diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md index 1760b3a8..94517dc7 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -76,8 +76,8 @@ void lambda_reference_capture() { - \[\] 空捕获列表 - \[name1, name2, ...\] 捕获一系列变量 -- \[&\] 引用捕获, 让编译器自行推导引用列表 -- \[=\] 值捕获, 让编译器自行推导值捕获列表 +- \[&\] 引用捕获, 从函数体内的使用确定引用捕获列表 +- \[=\] 值捕获, 从函数体内的使用确定值捕获列表 #### 4. 表达式捕获 From 5c50dbc591b045e3633fbe957c7702e483664566 Mon Sep 17 00:00:00 2001 From: "A. Jiang" Date: Tue, 21 May 2024 05:56:11 +0800 Subject: [PATCH 72/77] book: avoid implication that `volatile` may be usable in concurrency (#281) --- book/en-us/07-thread.md | 2 +- book/zh-cn/07-thread.md | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 379d4d2a..14f74062 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -228,7 +228,7 @@ We simply can't expect multiple consumers to be able to produce content in a par ## 7.5 Atomic Operation and Memory Model Careful readers may be tempted by the fact that the example of the producer-consumer model in the previous section may have compiler optimizations that cause program errors. -For example, the boolean `notified` is not modified by `volatile`, and the compiler may have optimizations for this variable, such as the value of a register. +For example, the compiler may have optimizations for the variable `notified`, such as the value of a register. As a result, the consumer thread can never observe the change of this value. This is a good question. To explain this problem, we need to further discuss the concept of the memory model introduced from C++11. Let's first look at a question. What is the output of the following code? ```cpp diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index 8e11407d..c32a3c6b 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -232,7 +232,7 @@ int main() { ## 7.5 原子操作与内存模型 细心的读者可能会对前一小节中生产者消费者模型的例子可能存在编译器优化导致程序出错的情况产生疑惑。 -例如，布尔值 `notified` 没有被 `volatile` 修饰，编译器可能对此变量存在优化，例如将其作为一个寄存器的值， +例如，编译器可能对变量 `notified` 存在优化，例如将其作为一个寄存器的值， 从而导致消费者线程永远无法观察到此值的变化。这是一个好问题，为了解释清楚这个问题，我们需要进一步讨论 从 C++ 11 起引入的内存模型这一概念。我们首先来看一个问题，下面这段代码输出结果是多少？ @@ -242,7 +242,7 @@ int main() { int main() { int a = 0; - int flag = 0; + volatile int flag = 0; std::thread t1([&]() { while (flag != 1); From 78b1cdf6bb454a7ed067fc2e81faa719a847935d Mon Sep 17 00:00:00 2001 From: "A. Jiang" Date: Tue, 21 May 2024 05:58:17 +0800 Subject: [PATCH 73/77] book: correct description of function template deduction from `auto` (#280) --- book/en-us/02-usability.md | 16 +++++++++++----- book/zh-cn/02-usability.md | 17 +++++++++++------ 2 files changed, 22 insertions(+), 11 deletions(-) diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md index 51d3edcf..eb8a21aa 100644 --- a/book/en-us/02-usability.md +++ b/book/en-us/02-usability.md @@ -418,17 +418,23 @@ auto i = 5; // i as int auto arr = new auto(10); // arr as int * ``` -Since C++ 20, `auto` can even be used as function arguments. Consider -the following example: +Since C++ 14, `auto` can even be used as function arguments in generic lambda expressions, +and such functionality is generalized to normal functions in C++ 20. +Consider the following example: ```cpp -int add(auto x, auto y) { +auto add14 = [](auto x, auto y) -> int { + return x+y; +} + +int add20(auto x, auto y) { return x+y; } auto i = 5; // type int auto j = 6; // type int -std::cout << add(i, j) << std::endl; +std::cout << add14(i, j) << std::endl; +std::cout << add20(i, j) << std::endl; ``` > **Note**: `auto` cannot be used to derive array types yet: @@ -481,7 +487,7 @@ type z == type x ### tail type inference -You may think that when we introduce `auto`, we have already mentioned that `auto` cannot be used for function arguments for type derivation. Can `auto` be used to derive the return type of a function? Still consider an example of an add function, which we have to write in traditional C++: +You may think that whether `auto` can be used to deduce the return type of a function. Still consider an example of an add function, which we have to write in traditional C++: ```cpp template diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index 11047e7e..c39f60a7 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -354,17 +354,22 @@ auto i = 5; // i 被推导为 int auto arr = new auto(10); // arr 被推导为 int * ``` -从 C++ 20 起，`auto` 甚至能用于函数传参，考虑下面的例子： +从 C++ 14 起，`auto` 能用于 lambda 表达式中的函数传参，而 C++ 20 起该功能推广到了一般的函数。考虑下面的例子： ```cpp -int add(auto x, auto y) { +auto add14 = [](auto x, auto y) -> int { return x+y; } -auto i = 5; // 被推导为 int -auto j = 6; // 被推导为 int -std::cout << add(i, j) << std::endl; +int add20(auto x, auto y) { + return x+y; +} + +auto i = 5; // type int +auto j = 6; // type int +std::cout << add14(i, j) << std::endl; +std::cout << add20(i, j) << std::endl; ``` > @@ -413,7 +418,7 @@ type z == type x ### 尾返回类型推导 -你可能会思考，在介绍 `auto` 时，我们已经提过 `auto` 不能用于函数形参进行类型推导，那么 `auto` 能不能用于推导函数的返回类型呢？还是考虑一个加法函数的例子，在传统 C++ 中我们必须这么写： +你可能会思考， `auto` 能不能用于推导函数的返回类型呢？还是考虑一个加法函数的例子，在传统 C++ 中我们必须这么写： ```cpp template From af45678ad42ddad195c954a5dd7ad80398440175 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?mq=E7=99=BD?= <3326284481@qq.com> Date: Tue, 21 May 2024 13:14:12 +0800 Subject: [PATCH 74/77] book: revise wording about "stack unwinding" --- book/en-us/07-thread.md | 4 +++- book/zh-cn/07-thread.md | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 14f74062..8173aefd 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -67,7 +67,9 @@ int main() { ``` Because C++ guarantees that all stack objects will be destroyed at the end of the declaration period, such code is also extremely safe. -Whether `critical_section()` returns normally or if an exception is thrown in the middle, a stack rollback is thrown, and `unlock()` is automatically called. +Whether `critical_section()` returns normally or if an exception is thrown in the middle, a stack unwinding is thrown, and `unlock()` is automatically called. + +> An exception is thrown and not caught (it is implementation-defined whether any stack unwinding is done in this case). `std::unique_lock` is more flexible than `std::lock_guard`. Objects of `std::unique_lock` manage the locking and unlocking operations on the `mutex` object with exclusive ownership (no other `unique_lock` objects owning the ownership of a `mutex` object). So in concurrent programming, it is recommended to use `std::unique_lock`. diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index c32a3c6b..ba80e7e5 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -68,7 +68,9 @@ int main() { ``` 由于 C++ 保证了所有栈对象在生命周期结束时会被销毁，所以这样的代码也是异常安全的。 -无论 `critical_section()` 正常返回、还是在中途抛出异常，都会引发堆栈回退，也就自动调用了 `unlock()`。 +无论 `critical_section()` 正常返回、还是在中途抛出异常，都会引发栈回溯，也就自动调用了 `unlock()`。 + +> 没有捕获抛出的异常（此时由实现定义是否进行栈回溯）。 而 `std::unique_lock` 则是相对于 `std::lock_guard` 出现的，`std::unique_lock` 更加灵活， `std::unique_lock` 的对象会以独占所有权（没有其他的 `unique_lock` 对象同时拥有某个 `mutex` 对象的所有权） From 2659a5f2073d7a96224567a9ebd0d5e5c266f6ba Mon Sep 17 00:00:00 2001 From: Shaobo Liu Date: Sat, 1 Jun 2024 18:08:51 +0800 Subject: [PATCH 75/77] book: add missing result (#291) Co-authored-by: Shaobo Liu --- book/zh-cn/02-usability.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/book/zh-cn/02-usability.md b/book/zh-cn/02-usability.md index c39f60a7..e9c84e9a 100644 --- a/book/zh-cn/02-usability.md +++ b/book/zh-cn/02-usability.md @@ -963,7 +963,7 @@ enum class new_enum : unsigned int { ```cpp if (new_enum::value3 == new_enum::value4) { - // 会输出 + // 会输出true std::cout << "new_enum::value3 == new_enum::value4" << std::endl; } ``` From 7b57e5e5a10a5707d278ffd4172815821202a6c9 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?mq=E7=99=BD?= <3326284481@qq.com> Date: Sat, 1 Jun 2024 18:09:32 +0800 Subject: [PATCH 76/77] book: revise the description of RAII (#288) --- book/en-us/07-thread.md | 2 +- book/zh-cn/07-thread.md | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 8173aefd..2279efdc 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -35,7 +35,7 @@ C++11 introduces a class related to `mutex`, with all related functions in the ` It can be locked by its member function `lock()`, and `unlock()` can be unlocked. But in the process of actually writing the code, it is best not to directly call the member function, Because calling member functions, you need to call `unlock()` at the exit of each critical section, and of course, exceptions. -At this time, C++11 also provides a template class `std::lock_guard` for the RAII syntax for the mutex. +At this time, C++11 also provides a template class `std::lock_guard` for the RAII mechanism for the mutex. RAII guarantees the exceptional security of the code while keeping the simplicity of the code. diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index ba80e7e5..dbb35085 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -35,7 +35,8 @@ C++11 引入了 `mutex` 相关的类，其所有相关的函数都放在 ` Date: Sat, 1 Jun 2024 18:10:55 +0800 Subject: [PATCH 77/77] book: revise usage of "mutex" and "instantiation" (#292) --- book/en-us/07-thread.md | 8 ++++---- book/zh-cn/07-thread.md | 7 +++---- 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/book/en-us/07-thread.md b/book/en-us/07-thread.md index 2279efdc..a9f41162 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -31,7 +31,7 @@ int main() { We have already learned the basics of concurrency technology in the operating system, or the database, and `mutex` is one of the cores. C++11 introduces a class related to `mutex`, with all related functions in the `` header file. -`std::mutex` is the most basic `mutex` class in C++11, and you can create a mutex by instantiating `std::mutex`. +`std::mutex` is the most basic mutex class in C++11, and a mutex can be created by constructing a `std::mutex` object. It can be locked by its member function `lock()`, and `unlock()` can be unlocked. But in the process of actually writing the code, it is best not to directly call the member function, Because calling member functions, you need to call `unlock()` at the exit of each critical section, and of course, exceptions. @@ -160,7 +160,7 @@ After encapsulating the target to be called, you can use `get_future()` to get a The condition variable `std::condition_variable` was born to solve the deadlock and was introduced when the mutex operation was not enough. For example, a thread may need to wait for a condition to be true to continue execution. A dead wait loop can cause all other threads to fail to enter the critical section so that when the condition is true, a deadlock occurs. -Therefore, the `condition_variable` instance is created primarily to wake up the waiting thread and avoid deadlocks. +Therefore, the `condition_variable` object is created primarily to wake up the waiting thread and avoid deadlocks. `notify_one()` of `std::condition_variable` is used to wake up a thread; `notify_all()` is to notify all threads. Below is an example of a producer and consumer model: @@ -276,8 +276,8 @@ This is a very strong set of synchronization conditions, in other words when it This seems too harsh for a variable that requires only atomic operations (no intermediate state). The research on synchronization conditions has a very long history, and we will not go into details here. Readers should understand that under the modern CPU architecture, atomic operations at the CPU instruction level are provided. -Therefore, in the C++11 multi-threaded shared variable reading and writing, the introduction of the `std::atomic` template, so that we instantiate an atomic type, will be an -Atomic type read and write operations are minimized from a set of instructions to a single CPU instruction. E.g: +Therefore, the `std::atomic` template is introduced in C++11 for the topic of multi-threaded shared variable reading and writing, which enables us to instantiate atomic types, +and minimize an atomic read or write operation from a set of instructions to a single CPU instruction. E.g: ```cpp std::atomic counter; diff --git a/book/zh-cn/07-thread.md b/book/zh-cn/07-thread.md index dbb35085..3c59a72d 100644 --- a/book/zh-cn/07-thread.md +++ b/book/zh-cn/07-thread.md @@ -31,7 +31,7 @@ int main() { 我们在操作系统、亦或是数据库的相关知识中已经了解过了有关并发技术的基本知识，`mutex` 就是其中的核心之一。 C++11 引入了 `mutex` 相关的类，其所有相关的函数都放在 `` 头文件中。 -`std::mutex` 是 C++11 中最基本的 `mutex` 类，通过实例化 `std::mutex` 可以创建互斥量， +`std::mutex` 是 C++11 中最基本的互斥量类，可以通过构造 `std::mutex` 对象创建互斥量， 而通过其成员函数 `lock()` 可以进行上锁，`unlock()` 可以进行解锁。 但是在实际编写代码的过程中，最好不去直接调用成员函数， 因为调用成员函数就需要在每个临界区的出口处调用 `unlock()`，当然，还包括异常。 @@ -163,7 +163,7 @@ int main() { 条件变量 `std::condition_variable` 是为了解决死锁而生，当互斥操作不够用而引入的。 比如，线程可能需要等待某个条件为真才能继续执行， 而一个忙等待循环中可能会导致所有其他线程都无法进入临界区使得条件为真时，就会发生死锁。 -所以，`condition_variable` 实例被创建出现主要就是用于唤醒等待线程从而避免死锁。 +所以，`condition_variable` 对象被创建出现主要就是用于唤醒等待线程从而避免死锁。 `std::condition_variable`的 `notify_one()` 用于唤醒一个线程； `notify_all()` 则是通知所有线程。下面是一个生产者和消费者模型的例子： @@ -283,8 +283,7 @@ int main() { 这对于一个仅需原子级操作（没有中间态）的变量，似乎太苛刻了。 关于同步条件的研究有着非常久远的历史，我们在这里不进行赘述。读者应该明白，现代 CPU 体系结构提供了 CPU 指令级的原子操作， -因此在 C++11 中多线程下共享变量的读写这一问题上，还引入了 `std::atomic` 模板，使得我们实例化一个原子类型，将一个 -原子类型读写操作从一组指令，最小化到单个 CPU 指令。例如： +因此在多线程下共享变量的读写这一问题上， C++11 中还引入了 `std::atomic` 模板，使得我们能实例化原子类型，并将一个原子写操作从一组指令，最小化到单个 CPU 指令。例如： ```cpp std::atomic counter;