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watchble.h

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#ifndef __WATCHBLE_H_INCLUDED__
#define __WATCHBLE_H_INCLUDED__

// $Id$

//**********************************************************************
//                                                                     *
//    Description:   Watchable object base class.                      *
//                                                                     *
//    Author:        Chris White (whitecf@bcs.org.uk)                  *
//                                                                     *
//    Copyright (C) 2003  Monitor Computing Services Ltd.              *
//                                                                     *
//    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 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 (http://www.gnu.org/copyleft/gpl.html) along with this   *
//    program; if not, write to:                                       *
//       The Free Software Foundation Inc.,                            *
//       59 Temple Place - Suite 330,                                  *
//       Boston, MA  02111-1307,                                       *
//       USA.                                                          *
//                                                                     *
//**********************************************************************
//                                                                     *
//    Notes:                                                           *
//                                                                     *
//**********************************************************************


namespace Monitor {
namespace Utility {

// Forward declerations within namespace
class CallbackBase;
class CallbackList;



class Watchable
{
public:
    Watchable();

    virtual ~Watchable();


    const CallbackBase&
    addWatch(const CallbackBase&    newWatch) const;

    void
    removeWatch(const CallbackBase&    oldWatch) const;

    void
    removeWatcher(const void*    watcher) const;

    virtual void
    updated(const void*    updateData = 0) const;

    void
    freeze() const;

    void
    thaw() const;


private:
    mutable CallbackList*    watchList;

    mutable int    frozen;
};

};  // namespace Utility
};  // namespace Monitor

#endif // __WATCHBLE_H_INCLUDED__

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