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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QREFCOUNT_H
#define QREFCOUNT_H
#include <QtCore/qatomic.h>
QT_BEGIN_NAMESPACE
namespace QtPrivate
{
class RefCount
{
public:
inline bool ref() noexcept {
int count = atomic.loadRelaxed();
if (count != -1) // !isStatic
atomic.ref();
return true;
}
inline bool deref() noexcept {
int count = atomic.loadRelaxed();
if (count == -1) // isStatic
return true;
return atomic.deref();
}
bool isStatic() const noexcept
{
// Persistent object, never deleted
return atomic.loadRelaxed() == -1;
}
bool isShared() const noexcept
{
int count = atomic.loadRelaxed();
return (count != 1) && (count != 0);
}
void initializeOwned() noexcept { atomic.storeRelaxed(1); }
void initializeUnsharable() noexcept { atomic.storeRelaxed(0); }
QBasicAtomicInt atomic;
};
}
#define Q_REFCOUNT_INITIALIZE_STATIC { Q_BASIC_ATOMIC_INITIALIZER(-1) }
QT_END_NAMESPACE
#endif
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