Late binding playground

late_binding_playground.cpp

#include <iostream>
#include <map>
#include <algorithm>
#include <functional>
#include <memory>

using namespace std;
using namespace std::placeholders;

class receiver
{
	function<void(receiver*, const string&)> func_;

	void print_message(const string& arg)
	{
		cout << "Yeah, " << arg.c_str() << endl;
	}

	void ignore_message(const string& arg)
	{
		cout << "ZzzzZzzz" << endl;
	}

public:
	receiver()
	{
		put_to_awake();
	}

	void handle_message(const string& arg)
	{
		func_(this, arg);
	}

	void put_to_awake()
	{
		func_ = bind(&receiver::print_message, this, _2);
	}

	void put_to_ignore()
	{
		func_ = bind(&receiver::ignore_message, this, _2);
	}
};

int main()
{
	receiver obj;
	obj.handle_message(string("one"));
	obj.put_to_ignore();	
	obj.handle_message(string("two"));
	obj.put_to_awake();
	obj.handle_message(string("three"));

	// Outputs:
	// Yeah, one
	// ZzzzZzzz
	// Yeah, three

	return 0;
}