导出函数

#include<string>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;


char const * greet()
{
 return "hello,world";

}

BOOST_PYTHON_MODULE(hello_ext)
{
 def("greet", greet);
}

import hello_ext
print hello_ext.greet()

导出默认构造的函数的类

#include<string>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;

struct World
{
 void set(string msg) { this->msg = msg; }
 string greet() { return msg; }

 string msg;
};

BOOST_PYTHON_MODULE(hello) //导出的module 名字
{
 class_<World>("World")
 .def("greet", &World::greet)
 .def("set", &World::set);
}

import hello 
planet = hello.World() # 调用默认构造函数，产生类对象
planet.set("howdy") # 调用对象的方法
print planet.greet() # 调用对象的方法

构造函数的导出：

#include<string>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;

struct World
{
 World(string msg):msg(msg){} //增加构造函数
 World(double a, double b):a(a),b(b) {} //另外一个构造函数
 void set(string msg) { this->msg = msg; }
 string greet() { return msg; }
 double sum_s() { return a + b; }
 string msg;
 double a;
 double b;
};

BOOST_PYTHON_MODULE(hello) //导出的module 名字
{
 class_<World>("World",init<string>()) 
 .def(init<double,double>()) // expose another construct
 .def("greet", &World::greet)
 .def("set", &World::set)
 .def("sum_s", &World::sum_s);
}

import hello
planet = hello.World(5,6)
planet2 = hello.World("hollo world")
 
print planet.sum_s()
print planet2.greet()

如果不想导出任何构造函数，则使用no_init:

class_<Abstract>("Abstract",no_init)

类的数据成员

#include<string>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;


struct Var
{
 Var(string name):name(name),value(){}
 string const name;

 float value;
};

BOOST_PYTHON_MODULE(hello_var)
{
 class_<Var>("Var", init<string>())
 .def_readonly("name", &Var::name) //只读
 .def_readwrite("value", &Var::value); //读写
}

import hello_var

var = hello_var.Var("hello_var")
var.value = 3.14
# var.name = 'hello' # error
print var.name

类的属性

// 类的属性

#include<string>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;


struct Num
{
 Num(){}
 float get() const { return val; }
 void set(float val) { this->val = val; }
 float val;

};

BOOST_PYTHON_MODULE(hello_num)
{
 class_<Num>("Num")
 .add_property("rovalue", &Num::get) // 对外：只读
 .add_property("value", &Num::get, &Num::set);// 对外读写 .value值会改变.rovalue值，存储着同样的数据。

}

import hello_num
num = hello_num.Num()
num.value = 10
print num.rovalue # result: 10

继承

// 类的继承

#include<string>
#include<iostream>
#include<boost/python.hpp>

using namespace std;
using namespace boost::python;

struct Base {
 virtual ~Base() {};
 virtual string getName() { return "Base"; }

 string str;
};

struct Derived : Base {

 string getName() { return "Derived"; }

};


void b(Base *base) { cout << base->getName() << endl; };

void d(Derived *derived) { cout << derived->getName() << endl; };

Base * factory() { return new Derived; }

/*
 下面的额外的代码如果去掉会报错。
 解决地址：http://stackoverflow.com/questions/38261530/unresolved-external-symbols-since-visual-studio-2015-update-3-boost-python-link/38291152#38291152
*/
namespace boost
{
 template <>
 Base const volatile * get_pointer<class Base const volatile >(
 class Base const volatile *c)
 {
 return c;
 }
}


BOOST_PYTHON_MODULE(hello_derived)
{
 class_<Base>("Base")
 .def("getName", &Base::getName)
 .def_readwrite("str", &Base::str);


 class_<Derived, bases<Base> >("Derived")
 .def("getName", &Derived::getName)
 .def_readwrite("str", &Derived::str);


 def("b", b);
 def("d", d);

 def("factory", factory,
 return_value_policy<manage_new_object>());//

}

import hello_derived
derive = hello_derived.factory()
hello_derived.d(derive)

类的虚函数：

/*
 类的虚函数，实现的功能是：可以编写Python类，来继承C++类
*/
#include<boost/python.hpp>

#include<boost/python/wrapper.hpp>
#include<string>
#include<iostream>

using namespace boost::python;
using namespace std;

struct Base
{
 virtual ~Base() {}
 virtual int f() { return 0; };
};


struct BaseWrap : Base, wrapper<Base>
{
 int f()
 {
 if (override f = this->get_override("f"))
  return f(); //如果函数进行重载了，则返回重载的
 return Base::f(); //否则返回基类
 }
 int default_f() { return this->Base::f(); }
};

BOOST_PYTHON_MODULE(hello_virtual)
{
 class_<BaseWrap, boost::noncopyable>("Base")
 .def("f", &Base::f, &BaseWrap::default_f);


}

import hello_virtual
 
 
base = hello_virtual.Base()
# 定义派生类，继承C++类
class Derived(hello_virtual.Base):
 def f(self):
 return 42
 
derived = Derived()
 
 
print base.f()
 
print derived.f()