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

void
hello (void)
{
std::cout << "Hello, World" << std::endl;
}

class Foo
	{
public:
	Foo (int x) : m_x(x) { }
	void print_sum (int x, int y)
		{ std::cout << "Sum: " << x+y+m_x << std::endl; }
	void print_product (int x, int y)
		{ std::cout << "Product: " << x*y*m_x << std::endl; }

private:
	int m_x;
	};

int main(void)
{
boost::signal<void ()> sig;

sig.connect(&hello);

sig();


Foo foo(2);

boost::signal<void (int, int)> sig2;

sig2.connect (boost::bind(&Foo::print_sum, foo, _1, _2));
sig2.connect (boost::bind(&Foo::print_product, foo, _1, _2));

sig2(2,3);
sig2(2,2);

return 0;
}