libs/signals2/example/ordering_slots.cpp
// Ordered slots hello world example for Boost.Signals2
// Copyright Douglas Gregor 2001-2004.
// 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 <iostream>
#include <boost/signals2/signal.hpp>
struct Hello
{
void operator()() const
{
std::cout << "Hello";
}
};
struct World
{
void operator()() const
{
std::cout << ", World!" << std::endl;
}
};
//[ good_morning_def_code_snippet
struct GoodMorning
{
void operator()() const
{
std::cout << "... and good morning!" << std::endl;
}
};
//]
int main()
{
//[ hello_world_ordered_code_snippet
boost::signals2::signal<void ()> sig;
sig.connect(1, World()); // connect with group 1
sig.connect(0, Hello()); // connect with group 0
//]
//[ hello_world_ordered_invoke_code_snippet
// by default slots are connected at the end of the slot list
sig.connect(GoodMorning());
// slots are invoked this order:
// 1) ungrouped slots connected with boost::signals2::at_front
// 2) grouped slots according to ordering of their groups
// 3) ungrouped slots connected with boost::signals2::at_back
sig();
//]
return 0;
}