60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
// singleton.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 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; 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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// 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 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, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef SINGLETON_HH
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#define SINGLETON_HH 1
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#include <glibmm/thread.h>
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#include "config.h"
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namespace sgpem
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{
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/** \brief An abstract implementation of the Singleton design pattern.
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*
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* Singleton implementers constuctor will have to declare friendliness
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* to Singleton::get_instance(). This also attempts to achieve
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* thread-safeness.
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*/
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template<typename Instantiated_class>
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class SG_DLLEXPORT Singleton
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{
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public:
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/** \brief Ensures thread safety is respected, and returns the instantiated object
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*
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* This is done by locking _instance via a mutex, before intantiating the
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* Instantiated_class attribute (if not done before).
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*
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* \return The instantiated object
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*/
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static Instantiated_class& get_instance();
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protected:
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static Glib::StaticMutex SG_DLLLOCAL _mutex;
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private:
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static SG_DLLLOCAL Instantiated_class* _instance;
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}
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; //~ class Singleton
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} //~ namespace sgpem
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#endif //~ SINGLETON_HH
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