1 files changed, 168 insertions, 0 deletions
diff --git a/src/corelib/kernel/qpointer.h b/src/corelib/kernel/qpointer.h
new file mode 100644
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+++ b/src/corelib/kernel/qpointer.h
@@ -0,0 +1,168 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPOINTER_H
+#define QPOINTER_H
+
+#include <QtCore/qobject.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+template <class T>
+class QPointer
+{
+    QObject *o;
+public:
+    inline QPointer() : o(0) {}
+    inline QPointer(T *p) : o(p)
+        { QMetaObject::addGuard(&o); }
+    inline QPointer(const QPointer<T> &p) : o(p.o)
+        { QMetaObject::addGuard(&o); }
+    inline ~QPointer()
+        { QMetaObject::removeGuard(&o); }
+    inline QPointer<T> &operator=(const QPointer<T> &p)
+        { if (this != &p) QMetaObject::changeGuard(&o, p.o); return *this; }
+    inline QPointer<T> &operator=(T* p)
+        { if (o != p) QMetaObject::changeGuard(&o, p); return *this; }
+
+    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)); }
+};
+
+
+#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
+
+template <class T>
+inline bool operator==(const T *o, const QPointer<T> &p)
+{ return o == p.operator->(); }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p, const T *o)
+{ return p.operator->() == o; }
+
+#else
+
+template<class T>
+inline bool operator==(const void *o, const QPointer<T> &p)
+{ return o == p.operator->(); }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p, const void *o)
+{ return p.operator->() == o; }
+
+#endif
+
+template <class T>
+inline bool operator==(T *o, const QPointer<T> &p)
+{ return o == p.operator->(); }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p, T *o)
+{ return p.operator->() == o; }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)
+{ return p1.operator->() == p2.operator->(); }
+
+
+#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
+
+template <class T>
+inline bool operator!=(const T *o, const QPointer<T> &p)
+{ return o != p.operator->(); }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p, const T *o)
+{ return p.operator->() != o; }
+
+#else
+
+template<class T>
+inline bool operator!= (const void *o, const QPointer<T> &p)
+{ return o != p.operator->(); }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p, const void *o)
+{ return p.operator->() != o; }
+
+#endif
+
+template <class T>
+inline bool operator!=(T *o, const QPointer<T> &p)
+{ return o != p.operator->(); }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p, T *o)
+{ return p.operator->() != o; }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)
+{ return p1.operator->() != p2.operator->() ; }
+
+// Make MSVC < 1400 (2005) handle "if (NULL == p)" syntax
+#if defined(Q_CC_MSVC) && (_MSC_VER < 1400)
+template<class T>
+inline bool operator== (int i, const QPointer<T> &p)
+{ Q_ASSERT(i == 0); return !i && p.isNull(); }
+
+template<class T>
+inline bool operator!= (int i, const QPointer<T> &p)
+{ Q_ASSERT(i == 0); return !i && !p.isNull(); }
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QPOINTER_H