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Diffstat (limited to 'src/qml/qml/ftw/qrecursionwatcher_p.h')
-rw-r--r-- | src/qml/qml/ftw/qrecursionwatcher_p.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/qml/qml/ftw/qrecursionwatcher_p.h b/src/qml/qml/ftw/qrecursionwatcher_p.h new file mode 100644 index 0000000000..16886edf12 --- /dev/null +++ b/src/qml/qml/ftw/qrecursionwatcher_p.h @@ -0,0 +1,105 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtQml 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 QRECURSIONWATCHER_P_H +#define QRECURSIONWATCHER_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include <QtCore/qglobal.h> + +QT_BEGIN_NAMESPACE + +class QRecursionNode; +class QRecursionNode { +public: + inline QRecursionNode(); + bool *_r; +}; + +template<class T, QRecursionNode T::*Node> +class QRecursionWatcher { +public: + inline QRecursionWatcher(T *); + inline ~QRecursionWatcher(); + inline bool hasRecursed() const; +private: + T *_t; + bool _r; +}; + +QRecursionNode::QRecursionNode() +: _r(0) +{ +} + +template<class T, QRecursionNode T::*Node> +QRecursionWatcher<T, Node>::QRecursionWatcher(T *t) +: _t(t), _r(false) +{ + if ((_t->*Node)._r) *(_t->*Node)._r = true; + (_t->*Node)._r = &_r; +} + +template<class T, QRecursionNode T::*Node> +QRecursionWatcher<T, Node>::~QRecursionWatcher() +{ + if ((_t->*Node)._r == &_r) (_t->*Node)._r = 0; +} + +template<class T, QRecursionNode T::*Node> +bool QRecursionWatcher<T, Node>::hasRecursed() const +{ + return _r; +} + +QT_END_NAMESPACE + +#endif // QRECURSIONWATCHER_P_H |