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overloading half
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‎Examples/call_policies/README.md

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@@ -9,29 +9,18 @@
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Python 3.5.2 (default, Nov 17 2016, 17:05:23)
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[GCC 5.4.0 20160609] on linux
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Type "help", "copyright", "credits" or "license" for more information.
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>>> import call_policies
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>>> y = call_policies.Y()
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>>> z = call_policies.Z()
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>>> x = call_policies.f(y, z)
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In function f
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>>> x.pr()
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pr val: 3 from x
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>>> del y
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>>> x.pr()
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pr val: 32 from x # the memory used to store x.val has been freed and currently store something else
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>>> y = call_policies.Y()
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>>> x = call_policies.f(y, z)
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In function f
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>>> x.pr()
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pr val: 3 from x
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>>> y.z_value()
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>>> from call_policies import *
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>>> y = Y()
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>>> z = Z()
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>>> r = f(y, z)
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In function f
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>>> y.x.get()
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3
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>>> r.get()
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3
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>>> y.x.set(2)
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>>> r.get()
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2
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>>> del z
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>>> y.z_value() # same reason as before
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0
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>>>
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‎Examples/call_policies/call_policies.cpp

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@@ -41,6 +41,6 @@ BOOST_PYTHON_MODULE(call_policies)
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.def("get", &Z::get)
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.def("set", &Z::set);
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def("f", f, return_value_policy<reference_existing_object>());
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def("ff", f, return_internal_reference<1
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def("ff", f, return_internal_reference<1,
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with_custodian_and_ward<1, 2> >());
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}

‎Examples/overloading/README.md

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# overloading
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###### python3 overloading
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cd Boost-Python-Examples/Examples/overloading
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make
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python3
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Python 3.5.2 (default, Aug 18 2017, 17:48:00)
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[GCC 5.4.0 20160609] on linux
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Type "help", "copyright", "credits" or "license" for more information.
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>>> from overloading import *
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>>> x = X()
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>>> x.f(1)
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f(int a)
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True
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>>> x.f(1, 2)
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f(int a, double b)
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True
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>>> x.f(1,2,3.3)
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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Boost.Python.ArgumentError: Python argument types in
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X.f(X, int, int, float)
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did not match C++ signature:
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f(X {lvalue}, int, int, int)
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f(X {lvalue}, int, double, char)
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f(X {lvalue}, int, double)
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f(X {lvalue}, int)
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>>> x.f(1,2,3)
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int(a, b, c), a + b + c is: 6
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6
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>>> not_member_func(4, "z", 2, 1)
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not mem func: a: 4 b: z c: 2 d: 1
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True
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>>> not_member_func(4, "z", 2, 1)
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not mem func: a: 4 b: z c: 2 d: 1
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True
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>>> not_member_func(4, "z")
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not mem func: a: 4 b: z c: 2 d: 3
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True
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>>> not_member_func(4, "z", 1)
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not mem func: a: 4 b: z c: 1 d: 3
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True
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>>> not_member_func(4, "z", 1, 3)
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not mem func: a: 4 b: z c: 1 d: 3
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True
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>>> xx = X()
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>>> xx.mem_func(1)
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variable argument: a: 1 b:  c: 2 d: 3
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True
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>>> xxx = X(1)
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other constructor
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>>> xxx = X(1, "s")
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other constructor
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>>>
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‎Examples/overloading/makefile

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PYTHON_VERSION = 3.5
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TARGET = overloading
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CFLAGS = -lm -pthread -O3 -std=c++11 -march=native -Wall -funroll-loops -Wno-unused-result
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PYTHON_INCLUDE = /usr/include/python$(PYTHON_VERSION)
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# Only need if install from source
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BOOST_INC = /usr/local/include/boost
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BOOST_LIB = /usr/local/lib
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ifeq ($(PYTHON_VERSION), 3.5)
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BOOST = lboost_python3
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PYTHON_VERSION_FINAL = $(PYTHON_VERSION)m
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else
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BOOST = lboost_python
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PYTHON_VERSION_FINAL = $(PYTHON_VERSION)
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endif
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$(TARGET).so: $(TARGET).o
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g++ $(CFLAGS) -shared -Wl,--export-dynamic $(TARGET).o -L$(BOOST_LIB) -$(BOOST) -L/usr/lib/python$(PYTHON_VERSION)/config -lpython$(PYTHON_VERSION_FINAL) -o $(TARGET).so
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$(TARGET).o: $(TARGET).cpp
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g++ $(CFLAGS) -I$(PYTHON_INCLUDE) -I$(BOOST_INC) -fPIC -c $(TARGET).cpp

‎Examples/overloading/overloading.cpp

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#include <boost/python.hpp>
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#include <iostream>
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#include <string>
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using namespace boost::python;
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struct X
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{
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X() = default;
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X(int a, char b = 'D', std::string c = "constructor", double d = 0.0) { std::cout << "other constructor" << std::endl;}
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bool f(int a)
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{
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std::cout << "f(int a)" << std::endl;
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return true;
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}
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bool f(int a, double b)
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{
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std::cout << "f(int a, double b)" << std::endl;
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return true;
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}
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bool f(int a, double b, char c)
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{
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std::cout << "f(int a, double b, char c)" << std::endl;
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return true;
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}
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int f(int a, int b, int c)
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{
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int result = a + b + c;
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std::cout << "int(a, b, c), a + b + c is: " << result << std::endl;
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return a + b + c;
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}
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bool mem_func(int a, char b = 1, unsigned c = 2, double d = 3)
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{
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std::cout << "variable argument: a: " << a << " b: " << b << " c: " << c << " d: " << d << std::endl;
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return true;
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}
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};
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bool not_mem_func(int a, char b = 1, unsigned c = 2, double d = 3)
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{
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std::cout << "not mem func: a: " << a << " b: " << b << " c: " << c << " d: " << d << std::endl;
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return true;
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}
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bool (X::*fx1)(int) = &X::f;
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bool (X::*fx2)(int, double) = &X::f;
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bool (X::*fx3)(int, double, char) = &X::f;
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int (X::*fx4)(int, int, int) = &X::f;
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/*
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// pointer name should be same as member function name, or compile error will be reported
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bool (X::*mem_func)(int, char, unsigned, double) = &X::mem_func;
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*/
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BOOST_PYTHON_FUNCTION_OVERLOADS(not_member_func_overloads, not_mem_func, 1, 4);
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BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(mem_func_overloads, X::mem_func, 1, 4);
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BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(f_mem_overloads, X::f, 1, 3);
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BOOST_PYTHON_MODULE(overloading)
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{
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class_<X>("X")
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.def("f", fx1)
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.def("f", fx2)
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.def("f", fx3)
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.def("f", fx4)
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.def(init<>())
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.def(init<int, optional<char, std::string, double>>())
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.def("mem_func", &X::mem_func, mem_func_overloads())
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.def("f_mem_func", fx1);
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def("not_member_func", not_mem_func, not_member_func_overloads());
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}

‎README.md

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* [class_virtual_nopure](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/class_virtual_nopure)
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* [operators](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/operators)
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* [special_operators](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/special_operators)
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* [call_policies](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/call_policies)
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* [overloading](https://github.com/zpoint/Boost-Python-Examples/tree/master/Examples/overloading)
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##### Boost Installation with python3 support
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