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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3DS_FOUNDATION_OPTION_H
#define QT3DS_FOUNDATION_OPTION_H
#include "foundation/Qt3DS.h"
#include "foundation/Qt3DSAssert.h"
namespace qt3ds {
namespace foundation {
struct Empty
{
};
template <typename TDataType>
class Option
{
TDataType mData;
bool mHasValue;
public:
Option(const TDataType &data)
: mData(data)
, mHasValue(true)
{
}
Option(const Empty &)
: mHasValue(false)
{
}
Option()
: mHasValue(false)
{
}
Option(const Option &other)
: mData(other.mData)
, mHasValue(other.mHasValue)
{
}
Option &operator=(const Option &other)
{
mData = other.mData;
mHasValue = other.mHasValue;
return *this;
}
bool isEmpty() const { return !mHasValue; }
void setEmpty() { mHasValue = false; }
bool hasValue() const { return mHasValue; }
const TDataType &getValue() const
{
QT3DS_ASSERT(mHasValue);
return mData;
}
TDataType &getValue()
{
QT3DS_ASSERT(mHasValue);
return mData;
}
TDataType &unsafeGetValue() { return mData; }
operator const TDataType &() const { return getValue(); }
operator TDataType &() { return getValue(); }
const TDataType *operator->() const { return &getValue(); }
TDataType *operator->() { return &getValue(); }
const TDataType &operator*() const { return getValue(); }
TDataType &operator*() { return getValue(); }
};
}
}
#endif
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