Selectable.h

/*
 * Copyright (C) 2008-2013 Marc Boris Duerner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef PT_SELECTABLE_H
#define PT_SELECTABLE_H
 
#include <Pt/System/Api.h>
#include <Pt/NonCopyable.h>
 
namespace Pt {
 
namespace System {
 
class EventLoop;
class SelectableList;

class PT_SYSTEM_API Selectable : protected NonCopyable
{
    friend class SelectableList;
 
    public:
        virtual ~Selectable();

        void setActive(EventLoop& parent);

        void detach();

        void cancel();

        bool run();

        EventLoop* parent() const
         { return _parent; }

        Selectable* next()
        { return _next; }
 
    protected:
        Selectable();

        void post();

        virtual void onAttach(EventLoop&)
        {}

        virtual void onDetach(EventLoop&)
        {}

        virtual void onCancel() = 0;

        virtual bool onRun() = 0;
 
    private:
        EventLoop* _parent;
        Selectable* _prev;
        Selectable* _next;
};
 
} // namespace System
 
} // namespace Pt
 
#endif // PT_SELECTABLE_H