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// Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
// SPDX-License-Identifier: BSD-3-Clause
#ifndef QGUARD_P_H
#define QGUARD_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qglobal.h"
QT_BEGIN_NAMESPACE
class QObject;
template<class T>
class QGuard
{
QObject *o;
QGuard<QObject> *next;
QGuard<QObject> **prev;
friend void q_guard_addGuard(QGuard<QObject> *);
friend void q_guard_removeGuard(QGuard<QObject> *);
friend class QObjectPrivate;
public:
inline QGuard();
inline QGuard(T *);
inline QGuard(const QGuard<T> &);
inline virtual ~QGuard();
inline QGuard<T> &operator=(const QGuard<T> &o);
inline QGuard<T> &operator=(T *);
inline bool isNull() const
{ return !o; }
inline T* operator->() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T& operator*() const
{ return *static_cast<T*>(const_cast<QObject*>(o)); }
inline operator T*() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T* data() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
protected:
virtual void objectDestroyed(T *) {}
};
QT_END_NAMESPACE
#include "private/qobject_p.h"
QT_BEGIN_NAMESPACE
inline void q_guard_addGuard(QGuard<QObject> *);
inline void q_guard_removeGuard(QGuard<QObject> *);
template<class T>
QGuard<T>::QGuard()
: o(0), next(0), prev(0)
{
}
template<class T>
QGuard<T>::QGuard(T *g)
: o(g), next(0), prev(0)
{
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
template<class T>
QGuard<T>::QGuard(const QGuard<T> &g)
: o(g.o), next(0), prev(0)
{
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
template<class T>
QGuard<T>::~QGuard()
{
if (prev) q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = 0;
}
template<class T>
QGuard<T> &QGuard<T>::operator=(const QGuard<T> &g)
{
if (g.o != o) {
if (prev)
q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = g.o;
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
return *this;
}
template<class T>
inline QGuard<T> &QGuard<T>::operator=(T *g)
{
if (g != o) {
if (prev)
q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = g;
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
return *this;
}
QT_END_NAMESPACE
#endif // QGUARD_P_H
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