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50 lines
2.5 KiB
C++
50 lines
2.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015-2016 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This program 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 as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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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 V3 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 this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_UTIL_THREADSAFESINGLETON_H_
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#define INCLUDE_UTIL_THREADSAFESINGLETON_H_
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//! Template class used to make from a class a singleton.
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/** S is the type of the singleton object to instantiate.
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<br> This class permits to gather all singleton code in the same place
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and not to pollute object interface with singleton methods.
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<br> Accessing to the instance of S is made through ThreadSafeSingleton<S>::instance()
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<br><B>Note :</B> The class using this adapter should have constructor and
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destructor protected and copy constructor and operator= private.
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<br>Besides it should declare the class ThreadSafeSingleton<S> friend in order
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this class can make the construction.
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*/
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template <class S> class ThreadSafeSingleton
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{
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public:
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static S& instance() { return *_pInstance; }
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protected:
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ThreadSafeSingleton() {}
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~ThreadSafeSingleton() { delete _pInstance; }
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static S* _pInstance;
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private:
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ThreadSafeSingleton(const ThreadSafeSingleton&) {}
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ThreadSafeSingleton& operator = (const ThreadSafeSingleton&) {return *this;}
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};
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template <class S> S *ThreadSafeSingleton<S>::_pInstance = new S;
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#endif /* INCLUDE_UTIL_THREADSAFESINGLETON_H_ */
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