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/*
 * Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#pragma once

#include <utility>
#include <vector>
#include <algorithm>
#include <iterator>
#include "CriticalSection.h"
#include "noexcept.h"

namespace dcpp {

using std::forward;
using std::vector;
using std::find;

template<typename Listener>
class Speaker {
    typedef vector<Listener*> ListenerList;

public:
    Speaker() noexcept { }
    virtual ~Speaker() { }

    template<typename... T>
    void fire(T&&... type) noexcept {
        Lock l(listenerCS);
        tmp = listeners;
        for(auto i = tmp.begin(); i != tmp.end(); ++i) {
            (*i)->on(std::forward<T>(type)...);
        }
    }

    void addListener(Listener* aListener) {
        Lock l(listenerCS);
        if(find(listeners.begin(), listeners.end(), aListener) == listeners.end())
            listeners.push_back(aListener);
    }

    void removeListener(Listener* aListener) {
        Lock l(listenerCS);
        auto it = find(listeners.begin(), listeners.end(), aListener);
        if(it != listeners.end())
            listeners.erase(it);
    }

    void removeListeners() {
        Lock l(listenerCS);
        listeners.clear();
    }

protected:
    ListenerList listeners;
    ListenerList tmp;
    CriticalSection listenerCS;
};

} // namespace dcpp