C++ pointer to member function

gistfile1.cpp

// Using std::function for callback

#include <iostream>
#include <utility>

class Client;
//  Calculator server
class Server{
public:
	typedef void (Client::*CB)(int result);
	
	void process(int x, int y, CB callback, Client *a){
		std::cout << "Server::process" << std::endl;
		(a->*callback)(x + y);
	}
};


class Client{
public:
	Client(int c) :
	no(c)
	{	}
	
	void start(){
		std::cout << "Client::Start" << no << std::endl;
		s.process(21, 27, &Client::print, this);
	}
	
	void print(int result){
		std::cout << "Client::print: " << no << result << std::endl;
	}
	
private:
	Server s;
	int no;
};


int main(){
	Client c1(1), c2(2);
	c1.start();
	c2.start();
	
	std::cout << "Done" << std::endl;
	return 0;
}
///EOF