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77 lines
2.4 KiB
77 lines
2.4 KiB
/*****************************************************************************
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* singleton.hpp: Generic Singleton pattern implementation
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****************************************************************************
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* Copyright (C) 2009 VideoLAN
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*
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* Authors: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
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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 Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_QT_SINGLETON_HPP_
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#define VLC_QT_SINGLETON_HPP_
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#include <stdlib.h>
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#include <vlc_threads.h>
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#include <vlc_cxx_helpers.hpp>
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#include "qt.hpp"
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template <typename T>
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class Singleton
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{
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public:
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template <bool create, class = typename std::enable_if<!create>::type>
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static T* getInstance( void )
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{
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vlc::threads::mutex_locker lock( m_mutex );
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return m_instance;
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}
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template <class T2 = T, typename... Args>
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static T* getInstance( Args&&... args )
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{
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vlc::threads::mutex_locker lock( m_mutex );
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if ( !m_instance )
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m_instance = new T2( std::forward<Args>( args )... );
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return m_instance;
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}
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static void killInstance()
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{
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vlc::threads::mutex_locker lock( m_mutex );
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delete m_instance;
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m_instance = nullptr;
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}
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protected:
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Singleton(){}
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virtual ~Singleton(){}
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/* Not implemented since these methods should *NEVER* been called.
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If they do, it probably won't compile :) */
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Singleton(const Singleton<T>&);
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Singleton<T>& operator=(const Singleton<T>&);
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private:
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static T* m_instance;
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static vlc::threads::mutex m_mutex;
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};
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template <typename T>
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T* Singleton<T>::m_instance = nullptr;
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template <typename T>
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vlc::threads::mutex Singleton<T>::m_mutex;
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#endif // include-guard
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