1 /* Copyright (c) 2014-2023. 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
13 namespace simgrid::xbt {
15 template <class S> class signal;
18 * A signal/slot mechanism, where you can attach callbacks to a given signal, and then fire the signal.
20 * The template parameter is the function signature of the signal (the return value currently ignored).
22 template <class R, class... P> class signal<R(P...)> {
23 using callback_type = std::function<R(P...)>;
24 std::map<unsigned int, callback_type> handlers_;
25 unsigned int callback_sequence_id = 0;
28 /** Add a new callback to this signal */
29 template <class U> unsigned int connect(U slot)
31 handlers_.insert({callback_sequence_id, std::move(slot)});
32 return callback_sequence_id++;
34 /** Fire that signal, invoking all callbacks */
35 R operator()(P... args) const
37 for (auto const& [_, callback] : handlers_)
40 /** Remove a callback */
41 void disconnect(unsigned int id) { handlers_.erase(id); }
42 /** Remove all callbacks */
43 void disconnect_slots() { handlers_.clear(); }
45 } // namespace simgrid::xbt