dtor.h

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//# dtor.h: base class for notification of object destruction
//# Copyright (C) 2012
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$


#ifndef VIEWER_DTOR_H_
#define VIEWER_DTOR_H_
#include <list>

namespace casa {
        namespace viewer {

                class dtorNotifier;

                class dtorNotifiee {
                public:
                        dtorNotifiee( ) { }
                        virtual ~dtorNotifiee( ) { }
                        virtual void dtorCalled( const dtorNotifier * ) = 0;
                };

                class dtorNotifier {
                public:
                        dtorNotifier( ) { }
                        // signals any dtorNotifiee's that are registered
                        ~dtorNotifier( );
                        void addNotifiee( dtorNotifiee * );
                        void removeNotifiee( dtorNotifiee * );
                private:
                        std::list<dtorNotifiee*> registrants;

                };
        }
}

#endif