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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Copyright (C) 2021 Intel Corporation.
** 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/qcoreapplication.h>
#include <QtCore/qglobalstatic.h>
QT_BEGIN_NAMESPACE
namespace QtGlobalStatic {
template <typename QAS> struct ApplicationHolder
{
using Type = typename QAS::QAS_Type;
using PlainType = std::remove_cv_t<Type>;
Q_CONSTINIT static inline std::aligned_union_t<1, PlainType> storage = {};
Q_CONSTINIT static inline QBasicAtomicInteger<qint8> guard = { QtGlobalStatic::Uninitialized };
Q_CONSTINIT static inline QBasicMutex mutex {};
static constexpr bool MutexLockIsNoexcept = noexcept(mutex.lock());
static constexpr bool ConstructionIsNoexcept = noexcept(QAS::innerFunction(nullptr));
ApplicationHolder() = default;
Q_DISABLE_COPY_MOVE(ApplicationHolder)
~ApplicationHolder()
{
if (guard.loadRelaxed() == QtGlobalStatic::Initialized) {
guard.storeRelease(QtGlobalStatic::Destroyed);
realPointer()->~PlainType();
}
}
static PlainType *realPointer()
{
return reinterpret_cast<PlainType *>(&storage);
}
// called from QGlobalStatic::instance()
PlainType *pointer() noexcept(MutexLockIsNoexcept && ConstructionIsNoexcept)
{
if (guard.loadRelaxed() == QtGlobalStatic::Initialized)
return realPointer();
QMutexLocker locker(&mutex);
if (guard.loadRelaxed() == QtGlobalStatic::Uninitialized) {
QAS::innerFunction(realPointer());
QObject::connect(QCoreApplication::instance(), &QObject::destroyed, reset);
guard.storeRelaxed(QtGlobalStatic::Initialized);
}
return realPointer();
}
static void reset()
{
if (guard.loadRelaxed() == QtGlobalStatic::Initialized) {
QMutexLocker locker(&mutex);
realPointer()->~PlainType();
guard.storeRelaxed(QtGlobalStatic::Uninitialized);
}
}
};
} // namespace QtGlobalStatic
#define Q_APPLICATION_STATIC(TYPE, NAME, ...) \
namespace { struct Q_QAS_ ## NAME { \
typedef TYPE QAS_Type; \
static void innerFunction(void *pointer) \
noexcept(noexcept(std::remove_cv_t<QAS_Type>(__VA_ARGS__))) \
{ \
new (pointer) QAS_Type(__VA_ARGS__); \
} \
}; } \
static QGlobalStatic<QtGlobalStatic::ApplicationHolder<Q_QAS_ ## NAME>> NAME;\
/**/
QT_END_NAMESPACE
#endif // QAPPLICATIONSTATIC_H
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