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/* -*- 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 CamSync.
*
* CamSync 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.
*
* CamSync 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 CamSync; 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)))
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