73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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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* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* template base class for Singletons
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*/
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/*
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USAGE: class myClass : Singleton<myClass>{};
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Modified from http://gamedev.net/reference/articles/article1954.asp
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*/
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#ifndef INCLUDED_SINGLETON
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#define INCLUDED_SINGLETON
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#include "lib/debug.h"
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template<typename T>
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class Singleton
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{
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static T* ms_singleton;
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public:
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Singleton()
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{
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debug_assert( !ms_singleton );
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ms_singleton = static_cast<T*>(this);
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}
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~Singleton()
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{
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debug_assert( ms_singleton );
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ms_singleton = 0;
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}
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static T& GetSingleton()
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{
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debug_assert( ms_singleton );
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return *ms_singleton;
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}
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static T* GetSingletonPtr()
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{
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debug_assert( ms_singleton );
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return ms_singleton;
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}
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static bool IsInitialised()
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{
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return (ms_singleton != 0);
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}
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};
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template <typename T>
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T* Singleton<T>::ms_singleton = 0;
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#endif
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