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'] 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 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 -

-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 6ef8ae93..45df2bec 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 @@ -65,4 +65,4 @@ The author is grateful to all contributors, including but not limited to [Contri ## Licenses -

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..dab6df95 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` @@ -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); @@ -59,21 +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 -std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3 +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 << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2 +std::cout << "pointer2.use_count() = " + << 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 +std::cout << "pointer3.use_count() = " + << pointer3.use_count() << std::endl; // pointer3 has reset, 0 ``` ## 5.3 `std::unique_ptr` @@ -81,12 +85,12 @@ std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // `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 ``` > `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 +118,30 @@ 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 +176,12 @@ 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 +191,8 @@ 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 @@ -197,8 +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 -
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). +
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 b3bd3720..e8b98547 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: + +| 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: -|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. | +| 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. ## 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 @@ -86,7 +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; @@ -105,7 +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; @@ -131,14 +132,14 @@ 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: @@ -188,16 +189,23 @@ 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; + 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]; @@ -225,9 +233,9 @@ 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 -
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 +
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..a9f41162 100644 --- a/book/en-us/07-thread.md +++ b/book/en-us/07-thread.md @@ -28,19 +28,20 @@ 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`. +`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. -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. ```cpp #include +#include #include int v = 1; @@ -66,9 +67,11 @@ 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). -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. @@ -80,6 +83,7 @@ For instance: ```cpp #include +#include #include int v = 1; @@ -114,10 +118,10 @@ 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: @@ -143,7 +147,8 @@ 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; } ``` @@ -155,7 +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: @@ -194,7 +199,8 @@ 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; @@ -217,15 +223,15 @@ 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. -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? +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 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 #include @@ -253,25 +259,25 @@ 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. +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. ### 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. -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: +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; @@ -322,7 +328,7 @@ 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. @@ -335,207 +341,208 @@ 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, 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; - ``` - - -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 + 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 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 + 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 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 + 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`. 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: + + ```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. @@ -543,10 +550,10 @@ They provide an critical foundation for standardized high performance computing ## 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) -- [Thread document](http://en.cppreference.com/w/cpp/thread) +- [C++ Concurrency in Action](https://www.amazon.com/dp/1617294691/ref=cm_sw_em_r_mt_dp_U_siEmDbRMMF960) +- [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 -
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).` +
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 d0c86838..10085030 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 @@ -27,4 +27,4 @@ TODO: ## Licenses -
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 +
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 f4d3342a..773a9612 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 -
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 +
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..04c69ee1 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 @@ -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 -
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 +
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 -
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 +
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 -
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 +
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 -
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 +
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 b9273e70..5e26f70e 100644 --- a/book/zh-cn/00-preface.md +++ b/book/zh-cn/00-preface.md @@ -11,11 +11,11 @@ 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。 -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。 @@ -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 - + -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 94a9a1b8..a74a3724 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 ``` @@ -137,12 +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 - + -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 abafda19..e9c84e9a 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; @@ -176,12 +176,13 @@ 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; } ``` -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 @@ -228,11 +229,13 @@ 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 #include +#include + class MagicFoo { public: std::vector vec; @@ -247,7 +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; } ``` @@ -258,7 +263,8 @@ 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}); @@ -308,8 +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： @@ -348,20 +354,29 @@ 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++ 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 +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 << add14(i, j) << std::endl; +std::cout << add20(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}; @@ -403,19 +418,19 @@ 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 R add(T x, U y) { - return x+y + return x+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，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： @@ -619,35 +634,6 @@ 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。 @@ -899,7 +885,7 @@ 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 { @@ -977,7 +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; } ``` @@ -989,7 +975,9 @@ 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); } @@ -1041,6 +1029,6 @@ std::cout << new_enum::value3 << std::endl ## 许可 - + -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 2c880375..94517dc7 100644 --- a/book/zh-cn/03-runtime.md +++ b/book/zh-cn/03-runtime.md @@ -67,19 +67,19 @@ 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 +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： - \[\] 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** +#### 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 @@ -90,29 +90,26 @@ 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() { +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; } ``` -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 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) { @@ -137,7 +134,7 @@ 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 } @@ -194,7 +191,8 @@ 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); @@ -214,34 +212,44 @@ 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。 -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"; } ``` -**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， +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。将亡值可能稍有些难以理解，我们来看这样的代码： @@ -294,7 +302,7 @@ 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 @@ -334,7 +342,7 @@ 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。 @@ -353,19 +361,19 @@ 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 @@ -398,8 +406,8 @@ 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); @@ -515,8 +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。 @@ -542,10 +550,10 @@ 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，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。 @@ -568,6 +576,6 @@ constexpr _Tp&& forward(typename std::remove_reference<_Tp>::type&& __t) noexcep ## 许可 - + -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 a9999a66..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， @@ -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 @@ -305,6 +305,6 @@ for(int i = 0; i != tuple_len(new_tuple); ++i) ## 许可 - + -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 a0830275..ef7467f7 100644 --- a/book/zh-cn/05-pointers.md +++ b/book/zh-cn/05-pointers.md @@ -20,14 +20,14 @@ order: 5 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。 -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 ``。 +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。 @@ -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); @@ -61,21 +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` @@ -175,7 +175,7 @@ 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 @@ -185,10 +185,10 @@ 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 - + -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..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]; @@ -230,11 +238,11 @@ 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 - + -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 c41bcc26..3c59a72d 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 @@ -31,17 +31,19 @@ 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。 -但是在在实际编写代码的过程中，最好不去直接调用成员函数， +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。 -这时候 C++11 还为互斥量提供了一个 RAII 语法的模板类 `std::lock_guard`。 +而 C++11 为互斥量提供了一个 RAII 机制的模板类 `std::lock_guard`。 + 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性。在 RAII 用法下，对于临界区的互斥量的创建只需要在作用域的开始部分，例如： ```cpp #include +#include #include int v = 1; @@ -66,10 +68,12 @@ 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。 -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()`。 +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`。 @@ -82,6 +86,7 @@ int main() { ```cpp #include +#include #include int v = 1; @@ -145,7 +150,8 @@ 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; } ``` @@ -157,7 +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： @@ -196,7 +202,8 @@ 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; @@ -228,7 +235,7 @@ 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？ @@ -238,7 +245,7 @@ int main() { int main() { int a = 0; - int flag = 0; + volatile int flag = 0; std::thread t1([&]() { while (flag != 1); @@ -258,7 +265,7 @@ 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， @@ -275,9 +282,8 @@ 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， -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： +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; @@ -309,7 +315,7 @@ 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 @@ -406,7 +412,7 @@ 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。 @@ -417,7 +423,7 @@ 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： @@ -426,7 +432,8 @@ 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 @@ -472,9 +479,9 @@ 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： @@ -487,9 +494,8 @@ 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([&]() { @@ -502,7 +508,7 @@ 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： @@ -551,12 +557,12 @@ 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) +- [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 ## 许可 - + -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 - + -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 0e33789e..8dc1861e 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() ``` @@ -187,6 +187,6 @@ int main() { ## 许可 - + -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)。 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 - + -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 - + -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 - + -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 - + -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/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 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; 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, 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; 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/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/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..." diff --git a/pdf/zh-cn/meta/template.tex b/pdf/zh-cn/meta/template.tex index 69f60116..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 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-ND)”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/package-lock.json b/website/package-lock.json index 7a49362c..fba1f465 100644 --- a/website/package-lock.json +++ b/website/package-lock.json @@ -11,12 +11,20 @@ "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": { "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": { @@ -31,6 +39,11 @@ "integrity": "sha512-RYTOHHdWipFUliRFMCS4X2Yn2X8M87V/OpSqWzKKOGhzqyUxzyVmhHDH9sAvG+ZuQf/TAOFsLCpMw09I1ufUnA==", "dev": true }, + "node_modules/abab": { + "version": "2.0.5", + "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.5.tgz", + "integrity": "sha512-9IK9EadsbHo6jLWIpxpR6pL0sazTXV6+SQv25ZB+F7Bj9mJNaOc4nCRabwd5M/JwmUa8idz6Eci6eKfJryPs6Q==" + }, "node_modules/abbrev": { "version": "1.1.1", "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", @@ -50,16 +63,70 @@ "node": ">= 0.6" } }, + "node_modules/acorn": { + "version": "8.6.0", + "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.6.0.tgz", + "integrity": "sha512-U1riIR+lBSNi3IbxtaHOIKdH8sLFv3NYfNv8sg7ZsNhcfl4HF2++BfqqrNAxoCLQW1iiylOj76ecnaUxz+z9yw==", + "bin": { + "acorn": "bin/acorn" + }, + "engines": { + "node": ">=0.4.0" + } + }, + "node_modules/acorn-globals": { + "version": "6.0.0", + "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-6.0.0.tgz", + "integrity": "sha512-ZQl7LOWaF5ePqqcX4hLuv/bLXYQNfNWw2c0/yX/TsPRKamzHcTGQnlCjHT3TsmkOUVEPS3crCxiPfdzE/Trlhg==", + "dependencies": { + "acorn": "^7.1.1", + "acorn-walk": "^7.1.1" + } + }, + "node_modules/acorn-globals/node_modules/acorn": { + "version": "7.4.1", + "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz", + "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==", + "bin": { + "acorn": "bin/acorn" + }, + "engines": { + "node": ">=0.4.0" + } + }, + "node_modules/acorn-walk": { + "version": "7.2.0", + "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz", + "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==", + "engines": { + "node": ">=0.4.0" + } + }, + "node_modules/agent-base": { + "version": "6.0.2", + "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz", + "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==", + "dependencies": { + "debug": "4" + }, + "engines": { + "node": ">= 6.0.0" + } + }, "node_modules/ajv": { - "version": "6.5.3", - "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.3.tgz", - "integrity": "sha512-LqZ9wY+fx3UMiiPd741yB2pj3hhil+hQc8taf4o2QGRFpWgZ2V5C8HA165DY9sS3fJwsk7uT7ZlFEyC3Ig3lLg==", + "version": "6.12.6", + "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz", + "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==", "dev": true, "dependencies": { - "fast-deep-equal": "^2.0.1", + "fast-deep-equal": "^3.1.1", "fast-json-stable-stringify": "^2.0.0", "json-schema-traverse": "^0.4.1", "uri-js": "^4.2.2" + }, + "funding": { + "type": "github", + "url": "https://github.com/sponsors/epoberezkin" } }, "node_modules/amdefine": { @@ -71,18 +138,18 @@ } }, "node_modules/ansi-align": { - "version": "2.0.0", - "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz", - "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=", + "version": "3.0.1", + "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.1.tgz", + "integrity": "sha512-IOfwwBF5iczOjp/WeY4YxyjqAFMQoZufdQWDd19SEExbVLNXqvpzSJ/M7Za4/sCPmQ0+GRquoA7bGcINcxew6w==", "dev": true, "dependencies": { - "string-width": "^2.0.0" + "string-width": "^4.1.0" } }, "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==", + "version": "5.0.1", + "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz", + "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==", "dev": true, "engines": { "node": ">=8" @@ -104,9 +171,9 @@ } }, "node_modules/anymatch": { - "version": "3.1.1", - "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz", - "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==", + "version": "3.1.2", + "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz", + "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==", "dev": true, "dependencies": { "normalize-path": "^3.0.0", @@ -149,18 +216,9 @@ "dev": true }, "node_modules/argparse": { - 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"ansi-regex": "^5.0.0" + "ansi-regex": "^5.0.1" } }, "strip-eof": { @@ -3814,11 +4499,6 @@ "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=", "dev": true }, - "striptags": { - "version": "3.1.1", - "resolved": "https://registry.npmjs.org/striptags/-/striptags-3.1.1.tgz", - "integrity": "sha1-yMPn/db7S7OjKjt1LltePjgJPr0=" - }, "stylus": { "version": "0.54.8", "resolved": "https://registry.npmjs.org/stylus/-/stylus-0.54.8.tgz", @@ -3842,23 +4522,15 @@ "ms": "2.0.0" } }, - "glob": { - "version": "7.1.6", - "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz", - "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==", - "requires": { - "fs.realpath": "^1.0.0", - "inflight": "^1.0.4", - "inherits": "2", - "minimatch": "^3.0.4", - "once": "^1.3.0", - "path-is-absolute": "^1.0.0" - } + "ms": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz", + "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=" }, - "mkdirp": { - "version": "1.0.4", - "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz", - "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==" + "source-map": { + "version": "0.7.3", + "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz", + "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==" } } }, @@ -3871,66 +4543,10 @@ "has-flag": "^4.0.0" } }, - "term-size": { - "version": "1.2.0", - "resolved": "https://registry.npmjs.org/term-size/-/term-size-1.2.0.tgz", - "integrity": "sha1-RYuDiH8oj8Vtb/+/rSYuJmOO+mk=", - "dev": true, - "requires": { - "execa": "^0.7.0" - }, - "dependencies": { - "cross-spawn": { - "version": "5.1.0", - "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz", - "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=", - "dev": true, - "requires": { - "lru-cache": "^4.0.1", - "shebang-command": "^1.2.0", - "which": "^1.2.9" - } - }, - "execa": { - "version": "0.7.0", - "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz", - "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=", - "dev": true, - "requires": { - "cross-spawn": "^5.0.1", - "get-stream": "^3.0.0", - "is-stream": "^1.1.0", - "npm-run-path": "^2.0.0", - "p-finally": "^1.0.0", - "signal-exit": "^3.0.0", - "strip-eof": "^1.0.0" - } - }, - "shebang-command": { - "version": "1.2.0", - "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz", - "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=", - "dev": true, - "requires": { - "shebang-regex": "^1.0.0" - } - }, - "shebang-regex": { - "version": "1.0.0", - "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz", - "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=", - "dev": true - }, - "which": { - "version": "1.3.1", - "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz", - "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==", - "dev": true, - "requires": { - "isexe": "^2.0.0" - } - } - } + "symbol-tree": { + "version": "3.2.4", + "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz", + "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==" }, "text-table": { "version": "0.2.0", @@ -3955,12 +4571,6 @@ "resolved": "https://registry.npmjs.org/timsort/-/timsort-0.3.0.tgz", "integrity": "sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q=" }, - "tiny-emitter": { - "version": "2.1.0", - "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz", - "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==", - "optional": true - }, "titlecase": { "version": "1.1.3", "resolved": "https://registry.npmjs.org/titlecase/-/titlecase-1.1.3.tgz", @@ -3976,10 +4586,61 @@ "is-number": "^7.0.0" } }, + "tough-cookie": { + "version": "4.0.0", + "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.0.0.tgz", + "integrity": "sha512-tHdtEpQCMrc1YLrMaqXXcj6AxhYi/xgit6mZu1+EDWUn+qhUf8wMQoFIy9NXuq23zAwtcB0t/MjACGR18pcRbg==", + "requires": { + "psl": "^1.1.33", + "punycode": "^2.1.1", + "universalify": "^0.1.2" + }, + "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==" + } + } + }, + "tr46": { + "version": "2.1.0", + "resolved": "https://registry.npmjs.org/tr46/-/tr46-2.1.0.tgz", + "integrity": "sha512-15Ih7phfcdP5YxqiB+iDtLoaTz4Nd35+IiAv0kQ5FNKHzXgdWqPoTIqEDDJmXceQt4JZk6lVPT8lnDlPpGDppw==", + "requires": { + "punycode": "^2.1.1" + }, + "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==" + } + } + }, "tslib": { - "version": "2.0.3", - "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.0.3.tgz", - "integrity": "sha512-uZtkfKblCEQtZKBF6EBXVZeQNl82yqtDQdv+eck8u7tdPxjLu2/lp5/uPW+um2tpuxINHWy3GhiccY7QgEaVHQ==" + "version": "2.3.1", + "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.1.tgz", + "integrity": "sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==" + }, + "type-check": { + "version": "0.3.2", + "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz", + "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=", + "requires": { + "prelude-ls": "~1.1.2" + } + }, + "type-fest": { + "version": "0.20.2", + "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz", + "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==", + "dev": true + }, + "universalify": { + "version": "0.1.2", + "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz", + "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==" }, "update-check": { "version": "1.5.2", @@ -3992,9 +4653,9 @@ } }, "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==", + "version": "4.4.1", + "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz", + "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==", "dev": true, "requires": { "punycode": "^2.1.0" @@ -4019,6 +4680,22 @@ "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=", "dev": true }, + "w3c-hr-time": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz", + "integrity": "sha512-z8P5DvDNjKDoFIHK7q8r8lackT6l+jo/Ye3HOle7l9nICP9lf1Ci25fy9vHd0JOWewkIFzXIEig3TdKT7JQ5fQ==", + "requires": { + "browser-process-hrtime": "^1.0.0" + } + }, + "w3c-xmlserializer": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz", + "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==", + "requires": { + "xml-name-validator": "^3.0.0" + } + }, "warehouse": { "version": "4.0.0", "resolved": "https://registry.npmjs.org/warehouse/-/warehouse-4.0.0.tgz", @@ -4033,6 +4710,34 @@ "rfdc": "^1.1.4" } }, + "webidl-conversions": { + "version": "6.1.0", + "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-6.1.0.tgz", + "integrity": "sha512-qBIvFLGiBpLjfwmYAaHPXsn+ho5xZnGvyGvsarywGNc8VyQJUMHJ8OBKGGrPER0okBeMDaan4mNBlgBROxuI8w==" + }, + "whatwg-encoding": { + "version": "1.0.5", + "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz", + "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==", + "requires": { + "iconv-lite": "0.4.24" + } + }, + "whatwg-mimetype": { + "version": "2.3.0", + "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz", + "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==" + }, + "whatwg-url": { + "version": "8.7.0", + "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.7.0.tgz", + "integrity": "sha512-gAojqb/m9Q8a5IV96E3fHJM70AzCkgt4uXYX2O7EmuyOnLrViCQlsEBmF9UQIu3/aeAIp2U17rtbpZWNntQqdg==", + "requires": { + "lodash": "^4.7.0", + "tr46": "^2.1.0", + "webidl-conversions": "^6.1.0" + } + }, "which": { "version": "2.0.2", "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz", @@ -4042,12 +4747,28 @@ } }, "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==", + "version": "3.1.0", + "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz", + "integrity": "sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==", + "dev": true, + "requires": { + "string-width": "^4.0.0" + } + }, + "word-wrap": { + "version": "1.2.3", + "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz", + "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==" + }, + "wrap-ansi": { + "version": "7.0.0", + "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz", + "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==", "dev": true, "requires": { - "string-width": "^2.1.1" + "ansi-styles": "^4.0.0", + "string-width": "^4.1.0", + "strip-ansi": "^6.0.0" } }, "wrappy": { @@ -4055,11 +4776,21 @@ "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=" }, - "yallist": { - "version": "2.1.2", - "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz", - "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=", - "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 98073dfc..8189f797 100755 --- a/website/package.json +++ b/website/package.json @@ -9,11 +9,11 @@ "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": { "hexo": "^5.3.0", - "serve": "^11.3.2" + "serve": "^13.0.2" } } 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 --- - + -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 @@

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。

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.

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') { %> 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。

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