libs/signals2/example/extended_slot.cpp
// Example program for connecting an extended slot,
// using a signal's connect_extended and extended_slot_type.
//
// Copyright Frank Mori Hess 2009.
//
// 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 <boost/signals2/signal.hpp>
#include <iostream>
#include <string>
namespace bs2 = boost::signals2;
void single_shot_slot(const bs2::connection &conn, const std::string &message)
{
conn.disconnect();
std::cout << message;
}
int main()
{
typedef bs2::signal<void (void)> sig_type;
sig_type sig;
{
sig_type::extended_slot_type hello(&single_shot_slot, _1, "Hello");
sig.connect_extended(hello);
}
sig(); // prints "Hello"
{
sig_type::extended_slot_type world(&single_shot_slot, _1, ", World!\n");
sig.connect_extended(world);
}
sig(); // only prints ", World!\n" since hello slot has disconnected itself
sig(); // prints nothing, world slot has disconnected itself
return 0;
}