1 /* Copyright (c) 2014-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_XBT_SIGNAL_HPP
7 #define SIMGRID_XBT_SIGNAL_HPP
16 template <class S> class signal;
19 * A signal/slot mechanism, where you can attach callbacks to a given signal, and then fire the signal.
21 * The template parameter is the function signature of the signal (the return value currently ignored).
23 template <class R, class... P> class signal<R(P...)> {
24 using callback_type = std::function<R(P...)>;
25 std::map<unsigned int, callback_type> handlers_;
26 unsigned int callback_sequence_id = 0;
29 /** Add a new callback to this signal */
30 template <class U> unsigned int connect(U slot)
32 handlers_.insert({callback_sequence_id, std::move(slot)});
33 return callback_sequence_id++;
35 /** Fire that signal, invoking all callbacks */
36 R operator()(P... args) const
38 for (auto const& handler : handlers_)
39 handler.second(args...);
41 /** Remove a callback */
42 void disconnect(unsigned int id) { handlers_.erase(id); }
43 /** Remove all callbacks */
44 void disconnect_slots() { handlers_.clear(); }
45 /** Get the amount of callbacks */
46 int get_slot_count() { return handlers_.size(); }