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Diffstat (limited to 'src/corelib/tools/qscopedpointer.h')
| -rw-r--r-- | src/corelib/tools/qscopedpointer.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/corelib/tools/qscopedpointer.h b/src/corelib/tools/qscopedpointer.h new file mode 100644 index 0000000000..fc8f9e2454 --- /dev/null +++ b/src/corelib/tools/qscopedpointer.h @@ -0,0 +1,199 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@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> +class QScopedPointer +{ +public: + explicit inline QScopedPointer(T *p = 0) : d(p) + { + } + + inline ~QScopedPointer() + { + delete d; + } + + inline T &operator*() const + { + return *d; + } + + inline T *operator->() const + { + return d; + } + + inline bool operator==(const QScopedPointer<T> &other) const + { + return d == other.d; + } + + inline bool operator!=(const QScopedPointer<T> &other) const + { + return d != other.d; + } + + inline operator bool() const + { + return d; + } + + inline T *data() const + { + return d; + } + + inline bool isNull() const + { + return !d; + } + + inline void reset(T *other = 0) + { + T *oldD = d; + d = other; + delete oldD; + } + + inline T *take() + { + T *oldD = d; + d = 0; + return oldD; + } + +protected: + T *d; + +private: + Q_DISABLE_COPY(QScopedPointer) +}; + +/* internal class - allows special handling for resetting and cleaning the pointer */ +template <typename T, typename CustomHandler> +class QScopedCustomPointer : public QScopedPointer<T> +{ +public: + inline QScopedCustomPointer(T *p = 0) + : QScopedPointer<T>(p) + { + } + + inline ~QScopedCustomPointer() + { + T *oldD = this->d; + this->d = 0; + CustomHandler::cleanup(oldD); + } + + inline void reset(T *other = 0) + { + CustomHandler::reset(this->d, other); + } + + inline T *&data_ptr() + { + return this->d; + } +}; + +/* Internal helper class - a handler for QShared* classes, to be used in QScopedCustomPointer */ +template <typename T> +class QScopedSharedPointerHandler +{ +public: + static inline void cleanup(T *d) + { + if (d && !d->ref.deref()) + delete d; + } + + static inline void reset(T *&d, T *other) + { + T *oldD = d; + d = other; + cleanup(oldD); + } +}; + +/* Internal. This should really have been a typedef, but you can't have a templated typedef :) + This class is basically a scoped pointer pointing to a ref-counted object + */ +template <typename T> +class QScopedSharedPointer : public QScopedCustomPointer<T, QScopedSharedPointerHandler<T> > +{ +public: + inline QScopedSharedPointer(T *p = 0) + : QScopedCustomPointer<T, QScopedSharedPointerHandler<T> >(p) + { + } + + inline void detach() + { + qAtomicDetach(this->d); + } + + inline void assign(T *other) + { + if (this->d == other) + return; + if (other) + other->ref.ref(); + T *oldD = this->d; + this->d = other; + QScopedSharedPointerHandler<T>::cleanup(oldD); + } +}; + +QT_END_NAMESPACE +QT_END_HEADER + +#endif // QSCOPEDPOINTER_H |