/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /*************************************************************************** * notifier.h * * Thu Sep 3 15:48:39 CEST 2015 * Copyright 2015 Bent Bisballe Nyeng * deva@aasimon.org ****************************************************************************/ /* * This file is part of DrumGizmo. * * DrumGizmo is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * DrumGizmo is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with DrumGizmo; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #pragma once #include <iostream> #include <functional> #include <vector> #include <map> #include <set> #include <type_traits> #include <utility> namespace GUI { class Listener; class NotifierBase { public: virtual void disconnect(Listener* object) {} }; class Listener { public: virtual ~Listener() { for(auto signal = signals.begin(); signal != signals.end(); ++signal) { (*signal)->disconnect(this); } } void registerNotifier(NotifierBase* signal) { signals.insert(signal); } void unregisterNotifier(NotifierBase* signal) { signals.erase(signal); } std::set<NotifierBase*> signals; }; template<typename T, typename... Args> class Notifier : public NotifierBase { public: Notifier() {} ~Notifier() { for(auto slot = slots.begin(); slot != slots.end(); ++slot) { (*slot).first->unregisterNotifier(this); } } void connect(Listener* object, std::function<void(T, Args...)> slot) { slots[object] = slot; if(object) { object->registerNotifier(this); } } void disconnect(Listener* object) { slots.erase(object); } void notify(T t, Args...args) { for(auto slot = slots.begin(); slot != slots.end(); ++slot) { (*slot).second(t, args...); } } std::map<Listener*, std::function<void(T, Args...)>> slots; }; } // GUI:: template<unsigned... Is> struct seq{}; template<unsigned I, unsigned... Is> struct gen_seq : gen_seq<I-1, I-1, Is...>{}; template<unsigned... Is> struct gen_seq<0, Is...> : seq<Is...>{}; template<unsigned I> struct placeholder{}; namespace std{ template<unsigned I> struct is_placeholder< ::placeholder<I> > : integral_constant<int, I>{}; } // std:: namespace aux{ template<unsigned... Is, class F, class... Ts> auto easy_bind(seq<Is...>, F&& f, Ts&&... vs) -> decltype(std::bind(std::forward<F>(f), std::forward<Ts>(vs)..., ::placeholder<1 + Is>()...)) { return std::bind(std::forward<F>(f), std::forward<Ts>(vs)..., ::placeholder<1 + Is>()...); } } // aux:: template<class R, class C, class... FArgs, class... Args> auto mem_bind(R (C::*ptmf)(FArgs...), Args&&... vs) -> decltype(aux::easy_bind(gen_seq<(sizeof...(FArgs) + 1) - sizeof...(Args)>(), ptmf, std::forward<Args>(vs)...)) { // the +1s for 'this' argument static_assert(sizeof...(Args) <= sizeof...(FArgs) + 1, "too many arguments to mem_bind"); return aux::easy_bind(gen_seq<(sizeof...(FArgs) + 1) - sizeof...(Args)>(), ptmf, std::forward<Args>(vs)...); } template<class T, class C, class... Args> auto mem_bind(T C::*ptmd, Args&&... vs) -> decltype(aux::easy_bind(gen_seq<1 - sizeof...(Args)>(), ptmd, std::forward<Args>(vs)...)) { // just 'this' argument static_assert(sizeof...(Args) <= 1, "too many arguments to mem_bind"); return aux::easy_bind(gen_seq<1 - sizeof...(Args)>(), ptmd, std::forward<Args>(vs)...); } //#define obj_connect_old(SRC, SIG, TAR, SLO) (SRC).SIG.connect(&(TAR), mem_bind(&decltype(TAR)::SLO, TAR)) #define fun_connect(SRC, SIG, SLO) \ (SRC).SIG.connect(nullptr, SLO) #define obj_connect(SRC, SIG, TAR, SLO) \ (SRC)->SIG.connect(TAR, mem_bind(&SLO, std::ref(*TAR)))