//a bind function example

#include <iostream>

template<typename ReturnType,typename ArgType>

class BaseFunction{

public:

virtual ReturnType operator()(ArgType arg)=0;

};

template<typename Class,typename ReturnType,typename ArgType>

class MemberFunction:public BaseFunction<ReturnType,ArgType>{

private:

typedef ReturnType (Class::*Func)(ArgType);

Func func;

Class *obj;

public:

MemberFunction(Class *obj,Func func):obj(obj),func(func){}

ReturnType operator()(ArgType arg)

{

return (obj->*func)(arg);

}

};

template<typename ReturnType,typename ArgType>

class Function{

private:

BaseFunction<ReturnType,ArgType> *func;

public:

Function(BaseFunction<ReturnType,ArgType> *func):func(func){}

ReturnType operator()(ArgType arg)

{

return func->operator()(arg);

}

};

class Test{

public:

int say(int h){

std::cout<<"say"<<std::endl;

return 1;

}

};

template<typename Class,typename ReturnType,typename ArgType>

Function<ReturnType,ArgType> bind(ReturnType (Class::*func)(ArgType),Class *obj)

{

return new MemberFunction<Class,ReturnType,ArgType>(obj,func);

}

int main(){

Test t;

int i=2;

//MemberFunction<Test,int,int> b(&t,&Test::say);

Function<int,int> func= bind<Test,int,int>(&Test::say,&t);

func(1);

return 0;

}