diff options
| -rw-r--r-- | src/corelib/tools/qrefcount.cpp | 51 | ||||
| -rw-r--r-- | src/corelib/tools/qrefcount.h | 92 | ||||
| -rw-r--r-- | src/corelib/tools/tools.pri | 2 |
3 files changed, 145 insertions, 0 deletions
diff --git a/src/corelib/tools/qrefcount.cpp b/src/corelib/tools/qrefcount.cpp new file mode 100644 index 0000000000..c40214b2ab --- /dev/null +++ b/src/corelib/tools/qrefcount.cpp @@ -0,0 +1,51 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \class QtPrivate::RefCount + \internal + + QRefCount implements atomic ref counting for Qt's shared classes. It behaves very similar + to QAtomicInt, but ignores negative ref counts. + + This can be used to allow to implement e.g. const read-only QStringData objects. QString::shared_null and + the qs(...) macro make use of this feature. +*/ diff --git a/src/corelib/tools/qrefcount.h b/src/corelib/tools/qrefcount.h new file mode 100644 index 0000000000..9223cfe352 --- /dev/null +++ b/src/corelib/tools/qrefcount.h @@ -0,0 +1,92 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QREFCOUNT_H +#define QREFCOUNT_H + +#include <QtCore/qatomic.h> + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +QT_MODULE(Core) + +namespace QtPrivate +{ + +class RefCount +{ +public: + inline void ref() { + if (atomic >= 0) + atomic.ref(); + } + + inline bool deref() { + if (atomic < 0) + return true; + return atomic.deref(); + } + + inline bool operator==(int value) const + { return atomic.operator ==(value); } + inline bool operator!=(int value) const + { return atomic.operator !=(value); } + inline bool operator!() const + { return atomic.operator !(); } + inline operator int() const + { return atomic.operator int(); } + inline RefCount &operator=(int value) + { atomic = value; return *this; } + + QBasicAtomicInt atomic; +}; + +#define Q_REFCOUNT_INITIALIZER(a) { Q_BASIC_ATOMIC_INITIALIZER(a) } + +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri index 42cab84cc0..f5b38eb1c0 100644 --- a/src/corelib/tools/tools.pri +++ b/src/corelib/tools/tools.pri @@ -30,6 +30,7 @@ HEADERS += \ tools/qrect.h \ tools/qregexp.h \ tools/qringbuffer_p.h \ + tools/qrefcount.h \ tools/qscopedpointer.h \ tools/qscopedpointer_p.h \ tools/qscopedvaluerollback.h \ @@ -72,6 +73,7 @@ SOURCES += \ tools/qcontiguouscache.cpp \ tools/qrect.cpp \ tools/qregexp.cpp \ + tools/qrefcount.cpp \ tools/qshareddata.cpp \ tools/qsharedpointer.cpp \ tools/qsimd.cpp \ |