forked from 0ad/0ad
60 lines
1.0 KiB
C++
60 lines
1.0 KiB
C++
/**
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* =========================================================================
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* File : Singleton.h
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* Project : 0 A.D.
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* Description : template base class for Singletons
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* =========================================================================
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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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