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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/****************************************************************************
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**
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** Copyright (C) Qxt Foundation. Some rights reserved.
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**
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** This file is part of the QxtCore module of the Qxt library.
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**
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** This library is free software; you can redistribute it and/or modify it
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** under the terms of the Common Public License, version 1.0, as published
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** by IBM, and/or under the terms of the GNU Lesser General Public License,
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** version 2.1, as published by the Free Software Foundation.
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**
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** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY
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** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
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** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
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** FITNESS FOR A PARTICULAR PURPOSE.
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**
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** You should have received a copy of the CPL and the LGPL along with this
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** file. See the LICENSE file and the cpl1.0.txt/lgpl-2.1.txt files
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** included with the source distribution for more information.
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** If you did not receive a copy of the licenses, contact the Qxt Foundation.
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**
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** <http://libqxt.org> <foundation@libqxt.org>
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**
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****************************************************************************/
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#ifndef QXTNULL_H
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#define QXTNULL_H
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#include <qxtglobal.h>
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/*!
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\class QxtNull QxtNull
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\inmodule QxtCore
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\brief An object representing the "null" value for QxtNullable.
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\sa QxtNullable
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*/
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struct QXT_CORE_EXPORT QxtNull
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{
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/*! integer cast operator
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* In expressions, QxtNull behaves as an integer zero for compatibility with generic functions.
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*/
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operator int() const
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{
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return 0;
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}
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enum { isNull = true };
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};
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#ifndef QXT_NO_MACROS
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/*! \relates QxtNull
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* A convenience alias for QxtNull().
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*/
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#define QXT_NULL QxtNull()
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#endif // QXT_NO_MACROS
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#endif // QXTNULL_H
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