/**************************************************************************** ** Copyright (c) 2006 - 2011, the LibQxt project. ** See the Qxt AUTHORS file for a list of authors and copyright holders. ** All rights reserved. ** ** Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in the ** documentation and/or other materials provided with the distribution. ** * Neither the name of the LibQxt project nor the ** names of its contributors may be used to endorse or promote products ** derived from this software without specific prior written permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED ** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE ** DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY ** DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ** ** *****************************************************************************/ #ifndef QXTNULL_H #define QXTNULL_H #include /*! \class QxtNull QxtNull \inmodule QxtCore \brief An object representing the "null" value for QxtNullable. \sa QxtNullable */ struct QXT_CORE_EXPORT QxtNull { /*! integer cast operator * In expressions, QxtNull behaves as an integer zero for compatibility with generic functions. */ operator int() const { return 0; } enum { isNull = true }; }; #ifndef QXT_NO_MACROS /*! \relates QxtNull * A convenience alias for QxtNull(). */ #define QXT_NULL QxtNull() #endif // QXT_NO_MACROS #endif // QXTNULL_H