1 /* Copyright (c) 2014-2019. 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;
18 /** A signal/slot mechanism
20 * S is expected to be the function signature of the signal.
21 * I'm not sure we need a return value (it is currently ignored).
22 * If we don't we might use `signal<P1, P2, ...>` instead.
24 template<class R, class... P>
25 class signal<R(P...)> {
26 typedef std::function<R(P...)> callback_type;
27 std::map<unsigned int, callback_type> handlers_;
28 unsigned int callback_sequence_id = 0;
31 template <class U> unsigned int connect(U slot)
33 handlers_.insert({callback_sequence_id, std::move(slot)});
34 return callback_sequence_id++;
36 R operator()(P... args) const
38 for (auto const& handler : handlers_)
39 handler.second(args...);
41 void disconnect(unsigned int id) { handlers_.erase(id); }
42 void disconnect_slots() { handlers_.clear(); }
43 int get_slot_count() { return handlers_.size(); }