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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QAPPLICATIONSTATIC_H
#define QAPPLICATIONSTATIC_H
#include <QtCore/QMutex>
#include <QtCore/qglobalstatic.h>
QT_BEGIN_NAMESPACE
#define Q_APPLICATION_STATIC_INTERNAL_HOLDER(ARGS) \
Q_GLOBAL_STATIC_INTERNAL_HOLDER(ARGS) \
struct LifecycleHolder : public Holder \
{ \
LifecycleHolder() { connectLifecycle(); } \
BaseType *get() \
{ \
const QMutexLocker locker(&theMutex); \
if (value.get() == nullptr \
&& guard.loadRelaxed() == QtGlobalStatic::Initialized) { \
value.reset(ARGS); \
connectLifecycle(); \
} \
return value.get(); \
} \
void connectLifecycle() \
{ \
Q_ASSERT(QCoreApplication::instance()); \
QObject::connect(QCoreApplication::instance(), \
&QCoreApplication::destroyed, [this] { \
const QMutexLocker locker(&theMutex); \
value.reset(nullptr); \
}); \
} \
};
#define Q_APPLICATION_STATIC_INTERNAL(ARGS) \
Q_GLOBAL_STATIC_INTERNAL_DECORATION BaseType *innerFunction() \
{ \
Q_APPLICATION_STATIC_INTERNAL_HOLDER(ARGS) \
static LifecycleHolder holder; \
return holder.get(); \
}
#define Q_APPLICATION_STATIC_WITH_ARGS(TYPE, NAME, ARGS) \
QT_WARNING_PUSH \
QT_WARNING_DISABLE_CLANG("-Wunevaluated-expression") \
namespace { namespace Q_QAS_ ## NAME { \
typedef TYPE BaseType; \
typedef std::unique_ptr<BaseType> Type; \
QBasicAtomicInt guard = Q_BASIC_ATOMIC_INITIALIZER(QtGlobalStatic::Uninitialized); \
QBasicMutex theMutex; \
Q_APPLICATION_STATIC_INTERNAL((new BaseType ARGS)) \
} } \
static QGlobalStatic<TYPE, \
Q_QAS_ ## NAME::innerFunction, \
Q_QAS_ ## NAME::guard> NAME; \
QT_WARNING_POP
#define Q_APPLICATION_STATIC(TYPE, NAME) \
Q_APPLICATION_STATIC_WITH_ARGS(TYPE, NAME, ())
QT_END_NAMESPACE
#endif // QAPPLICATIONSTATIC_H
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