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/****************************************************************************
**
** Copyright (C) 2010 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 QSCOPEDPOINTER_H
#define QSCOPEDPOINTER_H
#include <QtCore/qglobal.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
template <typename T>
struct QScopedPointerDeleter
{
static inline void cleanup(T *pointer)
{
// Enforce a complete type.
// If you get a compile error here, read the section on forward declared
// classes in the QScopedPointer documentation.
typedef char IsIncompleteType[ sizeof(T) ? 1 : -1 ];
(void) sizeof(IsIncompleteType);
delete pointer;
}
};
template <typename T>
struct QScopedPointerArrayDeleter
{
static inline void cleanup(T *pointer)
{
// Enforce a complete type.
// If you get a compile error here, read the section on forward declared
// classes in the QScopedPointer documentation.
typedef char IsIncompleteType[ sizeof(T) ? 1 : -1 ];
(void) sizeof(IsIncompleteType);
delete [] pointer;
}
};
struct QScopedPointerPodDeleter
{
static inline void cleanup(void *pointer) { if (pointer) qFree(pointer); }
};
template <typename T, typename Cleanup = QScopedPointerDeleter<T> >
class QScopedPointer
{
#ifndef Q_CC_NOKIAX86
typedef T *QScopedPointer:: *RestrictedBool;
#endif
public:
explicit inline QScopedPointer(T *p = 0) : d(p)
{
}
inline ~QScopedPointer()
{
T *oldD = this->d;
Cleanup::cleanup(oldD);
this->d = 0;
}
inline T &operator*() const
{
Q_ASSERT(d);
return *d;
}
inline T *operator->() const
{
Q_ASSERT(d);
return d;
}
inline bool operator!() const
{
return !d;
}
#if defined(Q_CC_NOKIAX86) || defined(Q_QDOC)
inline operator bool() const
{
return isNull() ? 0 : &QScopedPointer::d;
}
#else
inline operator RestrictedBool() const
{
return isNull() ? 0 : &QScopedPointer::d;
}
#endif
inline T *data() const
{
return d;
}
inline bool isNull() const
{
return !d;
}
inline void reset(T *other = 0)
{
if (d == other)
return;
T *oldD = d;
d = other;
Cleanup::cleanup(oldD);
}
inline T *take()
{
T *oldD = d;
d = 0;
return oldD;
}
inline void swap(QScopedPointer<T, Cleanup> &other)
{
qSwap(d, other.d);
}
typedef T *pointer;
protected:
T *d;
private:
Q_DISABLE_COPY(QScopedPointer)
};
template <class T, class Cleanup>
inline bool operator==(const QScopedPointer<T, Cleanup> &lhs, const QScopedPointer<T, Cleanup> &rhs)
{
return lhs.data() == rhs.data();
}
template <class T, class Cleanup>
inline bool operator!=(const QScopedPointer<T, Cleanup> &lhs, const QScopedPointer<T, Cleanup> &rhs)
{
return lhs.data() != rhs.data();
}
template <class T, class Cleanup>
Q_INLINE_TEMPLATE void qSwap(QScopedPointer<T, Cleanup> &p1, QScopedPointer<T, Cleanup> &p2)
{ p1.swap(p2); }
#ifndef QT_NO_STL
QT_END_NAMESPACE
namespace std {
template <class T, class Cleanup>
Q_INLINE_TEMPLATE void swap(QT_PREPEND_NAMESPACE(QScopedPointer)<T, Cleanup> &p1, QT_PREPEND_NAMESPACE(QScopedPointer)<T, Cleanup> &p2)
{ p1.swap(p2); }
}
QT_BEGIN_NAMESPACE
#endif
namespace QtPrivate {
template <typename X, typename Y> struct QScopedArrayEnsureSameType;
template <typename X> struct QScopedArrayEnsureSameType<X,X> { typedef X* Type; };
template <typename X> struct QScopedArrayEnsureSameType<const X, X> { typedef X* Type; };
}
template <typename T, typename Cleanup = QScopedPointerArrayDeleter<T> >
class QScopedArrayPointer : public QScopedPointer<T, Cleanup>
{
public:
template <typename D>
explicit inline QScopedArrayPointer(D *p = 0, typename QtPrivate::QScopedArrayEnsureSameType<T,D>::Type = 0)
: QScopedPointer<T, Cleanup>(p)
{
}
inline T &operator[](int i)
{
return this->d[i];
}
inline const T &operator[](int i) const
{
return this->d[i];
}
private:
explicit inline QScopedArrayPointer(void *) {
// Enforce the same type.
// If you get a compile error here, make sure you declare
// QScopedArrayPointer with the same template type as you pass to the
// constructor. See also the QScopedPointer documentation.
// Storing a scalar array as a pointer to a different type is not
// allowed and results in undefined behavior.
}
Q_DISABLE_COPY(QScopedArrayPointer)
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QSCOPEDPOINTER_H
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