76 lines
2 KiB
C++
76 lines
2 KiB
C++
// src/backend/observedSubject.hh - Copyright 2005, 2006, University
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// of Padova, dept. of Pure and Applied
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// Mathematics
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//
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// This file is part of SGPEMv2.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// SGPEMv2 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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//
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// You should have received a copy of the GNU General Public License
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// along with SGPEMv2; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef OBSERVEDSUBJECT_HH
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#define OBSERVEDSUBJECT_HH 1
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#include "config.h"
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#include <vector>
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#include <algorithm>
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#include "../observer.hh"
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namespace sgpem
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{
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class ObservedSubject;
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/** \brief Represents an observed entity.
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Abstract class which represents an observed entity. It calls Update() in all Observer objects
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which are attached to it. See the "Observer Pattern" for more informations.
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*/
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class SG_DLLEXPORT ObservedSubject
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{
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public:
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virtual ~ObservedSubject() = 0;
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/**
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This method calls Update() on each attached Observer. It should be called when the internal state
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of the ObservedSubject is changed and Observers have to be updated.
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*/
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void notify();
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/**
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\brief Adds an Observer object to the internal list.
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*/
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void attach(sgpem::Observer*);
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/**
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\brief Removes an Observer object from the internal list.
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\returns TRUE if the Observer object has been previously attached (is found in the list);
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\returns FALSE otherwise.
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*/
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bool detach(sgpem::Observer*);
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private:
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std::vector<Observer*> _attached;
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};
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} //~ namespace sgpem
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#endif
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