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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMLNULLABLEVALUE_P_H
#define QMLNULLABLEVALUE_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.
//
QT_BEGIN_NAMESPACE
template<typename T>
struct QmlNullableValue
{
QmlNullableValue()
: isNull(true), value(T()) {}
QmlNullableValue(const QmlNullableValue<T> &o)
: isNull(o.isNull), value(o.value) {}
QmlNullableValue(const T &t)
: isNull(false), value(t) {}
QmlNullableValue<T> &operator=(const T &t)
{ isNull = false; value = t; return *this; }
QmlNullableValue<T> &operator=(const QmlNullableValue<T> &o)
{ isNull = o.isNull; value = o.value; return *this; }
operator T() const { return value; }
void invalidate() { isNull = true; }
bool isValid() const { return !isNull; }
bool isNull;
T value;
};
QT_END_NAMESPACE
#endif // QMLNULLABLEVALUE_P_H
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