/**************************************************************************** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtQml module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Digia. For licensing terms and ** conditions see http://qt.digia.com/licensing. For further information ** use the contact form at http://qt.digia.com/contact-us. ** ** 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, Digia gives you certain additional ** rights. These rights are described in the Digia 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. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef QDELETEWATCHER_P_H #define QDELETEWATCHER_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 QT_BEGIN_NAMESPACE class QDeleteWatchable { public: inline QDeleteWatchable(); inline ~QDeleteWatchable(); private: friend class QDeleteWatcher; bool *_w; }; class QDeleteWatcher { public: inline QDeleteWatcher(QDeleteWatchable *data); inline ~QDeleteWatcher(); inline bool wasDeleted() const; private: void *operator new(size_t); bool *_w; bool _s; QDeleteWatchable *m_d; }; QDeleteWatchable::QDeleteWatchable() : _w(0) { } QDeleteWatchable::~QDeleteWatchable() { if (_w) *_w = true; } QDeleteWatcher::QDeleteWatcher(QDeleteWatchable *data) : _s(false), m_d(data) { if (!m_d->_w) m_d->_w = &_s; _w = m_d->_w; } QDeleteWatcher::~QDeleteWatcher() { if (false == *_w && &_s == m_d->_w) m_d->_w = 0; } bool QDeleteWatcher::wasDeleted() const { return *_w; } QT_END_NAMESPACE #endif // QDELETEWATCHER_P_H