56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
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/***********************************************************************
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* Copyright 2011-2012 Computer Graphics Group RWTH Aachen University. *
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* All rights reserved. *
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* Distributed under the terms of the MIT License (see LICENSE.TXT). *
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**********************************************************************/
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#ifndef ACGL_BASE_SINGLETON_HH
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#define ACGL_BASE_SINGLETON_HH
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/*
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* A very simple Singleton as a template.
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* Not thread save etc.
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*/
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#include <ACGL/ACGL.hh>
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namespace ACGL{
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namespace Base{
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template<typename CLASS>
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class Singleton
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{
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public:
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virtual ~Singleton(void) {}
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static ptr::shared_ptr<CLASS> the(void)
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{
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if(!spInstance)
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spInstance.reset(new CLASS());
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return(spInstance);
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}
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protected:
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Singleton(void){}
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private:
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Singleton(const Singleton&){}
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private:
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static ptr::shared_ptr<CLASS> spInstance;
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};
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template<typename CLASS>
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ptr::shared_ptr<CLASS> Singleton<CLASS>::spInstance = ptr::shared_ptr<CLASS>();
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#define ACGL_SINGLETON(Class) \
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friend class Base::Singleton< Class >; \
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private:\
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Class(const Class& ){ }\
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void operator=(Class& ){ }
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} // Base
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} // ACGL
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#endif
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