c++ python交互之boost.python 简集之类(class , struct)

最新推荐文章于 2024-04-14 11:08:13 发布

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文章标签：

#class #struct #python #c++ #string #makefile

本文介绍了如何使用Boost.Python库将C++的类和结构体暴露给Python，通过示例展示了如何定义C++的struct A、B、C、D、E、F，并在Python中进行调用和操作，包括构造函数、方法的绑定和使用。

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本章描述c++类，如何被python识别和使用

c++代码:src.cpp

#include <iostream>
#include <string>
using namespace std;

/**********************************************struct and class ***********************************/
struct A
{
   void greet()
   {
       cout << "just a test! from A" << endl;
   }

};

struct B
{
   B(string msg): msg(msg) {}

   void set(string msg)
   {
       this->msg = msg;
   }

   void greet()
   {
       cout << msg << endl;
   }

   string msg;
};

class C
{
public:
   void greet()
   {
       cout << "just a test! from C" << endl;
   }

};

pyhton转换代码 :src4py.cpp

#include <boost/python.hpp>
#include "src.cpp"
using namespace boost::python;
BOOST_PYTHON_MODULE(test)
{
    class_<A>("A")
        .def("greet", &A::greet)
    ;

    class_<B>("B",init<string>())   //注意构造函数的写法
        .def("greet", &B::greet)
        .def("set", &B::set)
    ;

    class_<C>("C")
        .def("greet", &C::greet)
    ;

    //Constructors overload
    class_<D>("D",init<string,int>())
        .def(init<string>())
        .def("printstr",&D::printstr)
        .def("printint",&D::printint)
    ;

    //if we do not wish to expose any constructors in E at all
    class_<E>("E",no_init)
        .def("printstr",&E::printstr)
    ;
    class_<F>("F")
        .def("initE",&F::initE)
        .def("printEstr",&F::printEstr)
    ;
}

编译成so过程省略，如果要看makefile文件，请参照第一篇文章

http://blog.youkuaiyun.com/linkyou/archive/2011/04/14/6323940.aspx

python中调用代码 test.py

import test

obj = test.A() //对应c++的struct A
obj.greet() //structA中的方法greet

obj = test.B("just a test! from B") //对应c++的struct B，且含构造函数
obj.greet()
obj.set("test again! from B")
obj.greet()

obj = test.C()
obj.greet()

obj = test.D("just a test!",1)
obj.printstr()
obj.printint()

#if we do not wish to expose any constructors in E at all
obj = test.F()
e = obj.initE("just a test!")
e.printstr()
obj.printEstr()