c++實現delegate—模版函數指針

原文地址：http://www.cppblog.com/tonykee/archive/2008/09/29/63034.html

#include "stdafx.h"

#include <iostream>

using namespace std;

template<typename T>
class A
{
private:
	typedef int (T::*delegateFun)(int);
	T * _This;
	delegateFun _deleGate;

public:    

	//This被代理的對象, delegateFun被代理的方法

	A(T * This, int (T::*delegateFun)(int))
	{
		_This = This;
		_deleGate = delegateFun;
	}

	//c被代理的參數
	int execue(int c)
	{
		return (_This->*_deleGate)(c);
	}

};

class B
{
public:
	int FunA(int a) {return a + 10;}
	int FunB(int a) {return a - 10;}
	B()
	{

	}
};

int _tmain(int argc, _TCHAR* argv[])
{

	B *objB = new B();

	A<B>  delegateObj1(objB, (&B::FunA));
	A<B>  delegateObj2(objB, (&B::FunB));

	cout << delegateObj1.execue(10) <<endl;
	cout << delegateObj2.execue(20) <<endl;

	return 0;

}