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// Boost.Signals library
// 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
#include <iostream>
#include <boost/signals/signal2.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;
sig.connect(print_sum());
sig.connect(print_product());
sig(3, 5);
boost::signals::connection print_diff_con = sig.connect(print_difference());
// sig is still connected to print_diff_con
assert(print_diff_con.connected());
sig(5, 3); // prints 8, 15, and 2
print_diff_con.disconnect(); // disconnect the print_difference slot
sig(5, 3); // now prints 8 and 15, but not the difference
assert(!print_diff_con.connected()); // not connected any more
return 0;
}
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