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/*
 *  Copyright (C) 2009 Juan Pedro Bolívar Puente
 *
 *  This file is part of Psychosynth.
 *   
 *  Psychosynth 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Psychosynth 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef PSYNTH_OBSERVER_H_
#define PSYNTH_OBSERVER_H_

#include <boost/bind.hpp>
#include <boost/signal.hpp>
#include <boost/signals/trackable.hpp>

namespace psynth
{
namespace base
{

#if 0

template <typename ...Types>
class signal : public sigc::signal <Types...> { };
#endif

class listener_base : public boost::signals::trackable
{
public:
    virtual ~listener_base ()
    {}

    void disconnect_all ()
    {
        listener_base empty;
        boost::signals::trackable::operator= (empty);
    }

protected:
};

template <class Listener>
class subject_base
{
public:
    virtual ~subject_base ()
    {}

    virtual void add_listener (Listener& l) = 0;

    virtual void del_listener (Listener& l) = 0;

protected:
    template <class Signal, class Slot>
    void remove_slot (Signal& sig, const Slot& s);
};

template <class Listener>
template <class Signal, class Slot>
void subject_base<Listener>::remove_slot (Signal& sig,
                                          const Slot& s)
{
    sig.disconnect (s);
}

} /* namespace base */
} /* namespace psynth */

#endif /* PSYNTH_OBSERVER_H_ */