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// Copyright (C) 2020 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 QLAZILYALLOCATED_P_H
#define QLAZILYALLOCATED_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/private/qglobal_p.h>
#include <QtCore/qtaggedpointer.h>
QT_BEGIN_NAMESPACE
template<typename T, typename Tag = typename QtPrivate::TagInfo<T>::TagType>
class QLazilyAllocated {
public:
inline QLazilyAllocated();
inline ~QLazilyAllocated();
inline bool isAllocated() const;
inline T *operator->() const;
inline T &value();
inline const T &value() const;
inline Tag tag() const;
inline void setTag(Tag t);
private:
mutable QTaggedPointer<T, Tag> d;
};
template<typename T, typename Tag>
QLazilyAllocated<T, Tag>::QLazilyAllocated()
{
}
template<typename T, typename Tag>
QLazilyAllocated<T, Tag>::~QLazilyAllocated()
{
delete d.data();
}
template<typename T, typename Tag>
bool QLazilyAllocated<T, Tag>::isAllocated() const
{
return !d.isNull();
}
template<typename T, typename Tag>
T &QLazilyAllocated<T, Tag>::value()
{
if (d.isNull()) d = new T;
return *d;
}
template<typename T, typename Tag>
const T &QLazilyAllocated<T, Tag>::value() const
{
if (d.isNull()) d = new T;
return *d;
}
template<typename T, typename Tag>
T *QLazilyAllocated<T, Tag>::operator->() const
{
return d.data();
}
template<typename T, typename Tag>
Tag QLazilyAllocated<T, Tag>::tag() const
{
return d.tag();
}
template<typename T, typename Tag>
void QLazilyAllocated<T, Tag>::setTag(Tag t)
{
d.setTag(t);
}
QT_END_NAMESPACE
#endif // QLAZILYALLOCATED_P_H
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