// FD.Delegate library examples
// Copyright Douglas Gregor 2001-2003. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
// Copyright (C) 2007 JaeWook Choi
// , modified from Boost.Signals difference_connection.cpp
#include <iostream>
#include <boost/signals/signal2.hpp>
#include <fd/delegate/delegate2.hpp>
#include <cassert>
struct print_sum {
void operator()(int x, int y) const { std::cout << x+y << std::endl; }
};
struct print_product {
void operator()(int x, int y) const { std::cout << x*y << std::endl; }
};
struct print_difference {
void operator()(int x, int y) const { std::cout << x-y << std::endl; }
};
int main()
{
boost::signal2<void, int, int> sig;
fd::delegate2<void, int, int> sig2;
sig.connect(print_sum());
sig.connect(print_product());
sig(3, 5);
sig2.add(print_sum());
sig2 += print_product();
sig2(3, 5);
boost::signals::connection print_diff_con = sig.connect(print_difference());
fd::multicast::token print_diff_tok = sig2.add(print_difference());
// sig is still connected to print_diff_con
assert(print_diff_con.connected());
// print_diff_tok is still connected to dg
assert(print_diff_tok.valid());
sig(5, 3); // prints 8, 15, and 2
sig2(5, 3); // prints 8, 15 and 2
print_diff_con.disconnect(); // disconnect the print_difference slot
print_diff_tok.remove(); // remove the print_difference
sig(5, 3); // now prints 8 and 15, but not the difference
sig2(5, 3); // now prints 8 and 15, but not the difference
assert(!print_diff_con.connected()); // not connected any more
assert(!print_diff_tok.valid()); // not connected any more
return 0;
}