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71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/*******************************************************************************
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* $Id$
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*
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*******************************************************************************/
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/*
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* Observer.h
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*
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* Created on: Oct 5, 2011
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* Author: bpaul@calpont.com
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*/
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#ifndef OBSERVER_H_
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#define OBSERVER_H_
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#include <list>
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using namespace std;
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namespace WriteEngine
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{
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class Subject; // forward deceleration
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class Observer
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{
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public:
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virtual ~Observer();
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virtual bool update(Subject* pSub) = 0;
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protected:
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Observer();
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};
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class Subject
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{
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public:
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Subject();
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virtual ~Subject();
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virtual void attach(Observer* Obs);
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virtual void detach(Observer* Obs);
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virtual void notify();
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private:
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typedef std::list<Observer*> Observers;
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Observers fObs;
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};
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}
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#endif /* OBSERVER_H_ */
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