57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
/*
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* Copyright (C) 2016 Alexander Makarov
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*
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* Source:
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* https://wiki.qt.io/Qt_thread-safe_singleton
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*
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* This file is a part of Breakpad-qt library.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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*/
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#ifndef SINGLETON
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#define SINGLETON
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#include <QtGlobal>
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#include <QScopedPointer>
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#include "call_once.h"
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template <class T>
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class Singleton
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{
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public:
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static T& instance()
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{
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qCallOnce(init, flag);
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return *tptr;
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}
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static void init()
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{
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tptr.reset(new T);
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}
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private:
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Singleton() {}
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~Singleton() {}
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Q_DISABLE_COPY(Singleton)
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static QScopedPointer<T> tptr;
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static QBasicAtomicInt flag;
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};
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template<class T> QScopedPointer<T> Singleton<T>::tptr(0);
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template<class T> QBasicAtomicInt Singleton<T>::flag = Q_BASIC_ATOMIC_INITIALIZER(CallOnce::CO_Request);
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#endif // SINGLETON
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