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Diffstat (limited to 'src/corelib/tools/qscopedpointer.h')
| -rw-r--r-- | src/corelib/tools/qscopedpointer.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/corelib/tools/qscopedpointer.h b/src/corelib/tools/qscopedpointer.h new file mode 100644 index 0000000000..92bccf5961 --- /dev/null +++ b/src/corelib/tools/qscopedpointer.h @@ -0,0 +1,245 @@ +/**************************************************************************** +** +** 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 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 |