#include <iostream>
#include <string>
#include <boost/signal.hpp>
#include <boost/bind.hpp>

typedef boost::signal<void ()> MySignal;

class Test : public boost::signals::trackable {
public:
	Test(const std::string &s, MySignal & sgn);
	void mySlot();
private:
	std::string str;
};

Test::Test(const std::string &s, MySignal & sgn) {
	str = s;
	sgn.connect(boost::bind(&Test::mySlot, this));
}

void Test::mySlot() {
	std::cerr << str << std::endl;
}

int main() {
	MySignal mySgn;
	std::cerr << "create A" << std::endl;
	Test *A = new Test("A", mySgn);
	std::cerr << "fire SGN" << std::endl;
	mySgn();
	std::cerr << "create B" << std::endl;
	Test *B = new Test("B", mySgn);
	std::cerr << "fire SGN" << std::endl;
	mySgn();
	std::cerr << "delete A" << std::endl;
	delete A;
	std::cerr << "fire SGN" << std::endl;
	mySgn();
	std::cerr << "delete B" << std::endl;
	delete B;
	std::cerr << "fire SGN" << std::endl;
	mySgn();

	std::cerr << "exit" << std::endl;
}