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/****************************************************************************
**
** Copyright (C) 2013 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_STATE_ID_TYPE_VALUE_H
#define QT3DS_STATE_ID_TYPE_VALUE_H
#include "Qt3DSState.h"
#include "foundation/Qt3DSDiscriminatedUnion.h"
// Discriminated union to unify different things that may be identified by an id
namespace qt3ds {
namespace state {
struct IdValueTypes
{
enum Enum {
NoIdValue = 0,
StateNode,
Send,
};
};
template <typename TDataType>
struct SIdValueTypeMap
{
static IdValueTypes::Enum GetType() { return IdValueTypes::NoIdValue; }
};
template <>
struct SIdValueTypeMap<SStateNode *>
{
static IdValueTypes::Enum GetType() { return IdValueTypes::StateNode; }
};
template <>
struct SIdValueTypeMap<SSend *>
{
static IdValueTypes::Enum GetType() { return IdValueTypes::Send; }
};
struct SIdValueUnionTraits
{
typedef IdValueTypes::Enum TIdType;
enum {
TBufferSize = sizeof(void *),
};
static TIdType getNoDataId() { return IdValueTypes::NoIdValue; }
template <typename TDataType>
static TIdType getType()
{
return SIdValueTypeMap<TDataType>().GetType();
}
template <typename TRetType, typename TVisitorType>
static TRetType visit(char *inData, TIdType inType, TVisitorType inVisitor)
{
switch (inType) {
case IdValueTypes::StateNode:
return inVisitor(*NVUnionCast<SStateNode **>(inData));
case IdValueTypes::Send:
return inVisitor(*NVUnionCast<SSend **>(inData));
default:
QT3DS_ASSERT(false);
case IdValueTypes::NoIdValue:
return inVisitor();
}
}
template <typename TRetType, typename TVisitorType>
static TRetType visit(const char *inData, TIdType inType, TVisitorType inVisitor)
{
switch (inType) {
case IdValueTypes::StateNode:
return inVisitor(*NVUnionCast<const SStateNode **>(inData));
case IdValueTypes::Send:
return inVisitor(*NVUnionCast<const SSend **>(inData));
default:
QT3DS_ASSERT(false);
case IdValueTypes::NoIdValue:
return inVisitor();
}
}
};
}
}
// need some specializations in the original nv foundation namespace
namespace qt3ds {
namespace foundation {
template <>
struct DestructTraits<qt3ds::state::SStateNode *>
{
void destruct(qt3ds::state::SStateNode *) {}
};
template <>
struct DestructTraits<qt3ds::state::SSend *>
{
void destruct(qt3ds::state::SSend *) {}
};
}
}
namespace qt3ds {
namespace state {
typedef qt3ds::foundation::
DiscriminatedUnion<qt3ds::foundation::
DiscriminatedUnionGenericBase<SIdValueUnionTraits,
SIdValueUnionTraits::TBufferSize>,
SIdValueUnionTraits::TBufferSize>
TIdUnionType;
struct SIdValue : public TIdUnionType
{
SIdValue() {}
SIdValue(const SIdValue &inOther)
: TIdUnionType(static_cast<const TIdUnionType &>(inOther))
{
}
SIdValue(SStateNode *inDt)
: TIdUnionType(inDt)
{
}
SIdValue(SSend *inDt)
: TIdUnionType(inDt)
{
}
SIdValue &operator=(const SIdValue &inOther)
{
TIdUnionType::operator=(inOther);
return *this;
}
bool operator==(const SIdValue &inOther) const { return TIdUnionType::operator==(inOther); }
bool operator!=(const SIdValue &inOther) const { return TIdUnionType::operator!=(inOther); }
bool empty() const { return getType() == IdValueTypes::NoIdValue; }
};
}
}
#endif
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