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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QMETATYPE_P_H
#define QMETATYPE_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.
//
#include <QtCore/private/qglobal_p.h>
#include "qmetatype.h"
QT_BEGIN_NAMESPACE
#define QMETATYPE_CONVERTER(To, From, assign_and_return) \
case makePair(QMetaType::To, QMetaType::From): \
if (onlyCheck) \
return true; \
{ \
const From &source = *static_cast<const From *>(from); \
To &result = *static_cast<To *>(to); \
assign_and_return \
}
#define QMETATYPE_CONVERTER_ASSIGN(To, From) \
QMETATYPE_CONVERTER(To, From, result = To(source); return true;)
#define QMETATYPE_CONVERTER_FUNCTION(To, assign_and_return) \
{ \
To &result = *static_cast<To *>(r); \
assign_and_return \
}
class Q_CORE_EXPORT QMetaTypeModuleHelper
{
Q_DISABLE_COPY_MOVE(QMetaTypeModuleHelper)
protected:
QMetaTypeModuleHelper() = default;
~QMetaTypeModuleHelper() = default;
public:
Q_WEAK_OVERLOAD // prevent it from entering the ABI and rendering constexpr useless
static constexpr auto makePair(int from, int to) -> quint64
{
return (quint64(from) << 32) + quint64(to);
}
virtual const QtPrivate::QMetaTypeInterface *interfaceForType(int) const = 0;
virtual bool convert(const void *, int, void *, int) const;
};
extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeGuiHelper;
extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeWidgetsHelper;
namespace QtMetaTypePrivate {
template<typename T>
struct TypeDefinition
{
static const bool IsAvailable = true;
};
// Ignore these types, as incomplete
#ifdef QT_BOOTSTRAPPED
template<> struct TypeDefinition<QBitArray> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QCborArray> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QCborMap> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QCborSimpleType> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QCborValue> { static const bool IsAvailable = false; };
#if QT_CONFIG(easingcurve)
template<> struct TypeDefinition<QEasingCurve> { static const bool IsAvailable = false; };
#endif
template<> struct TypeDefinition<QJsonArray> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QJsonDocument> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QJsonObject> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QJsonValue> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QUrl> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QByteArrayList> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_GEOM_VARIANT
template<> struct TypeDefinition<QRect> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QRectF> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QSize> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QSizeF> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QLine> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QLineF> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QPoint> { static const bool IsAvailable = false; };
template<> struct TypeDefinition<QPointF> { static const bool IsAvailable = false; };
#endif
#if !QT_CONFIG(regularexpression)
template<> struct TypeDefinition<QRegularExpression> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_CURSOR
template<> struct TypeDefinition<QCursor> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_MATRIX4X4
template<> struct TypeDefinition<QMatrix4x4> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_VECTOR2D
template<> struct TypeDefinition<QVector2D> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_VECTOR3D
template<> struct TypeDefinition<QVector3D> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_VECTOR4D
template<> struct TypeDefinition<QVector4D> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_QUATERNION
template<> struct TypeDefinition<QQuaternion> { static const bool IsAvailable = false; };
#endif
#ifdef QT_NO_ICON
template<> struct TypeDefinition<QIcon> { static const bool IsAvailable = false; };
#endif
template <typename T> inline bool isInterfaceFor(const QtPrivate::QMetaTypeInterface *iface)
{
// typeId for built-in types are fixed and require no registration
static_assert(QMetaTypeId2<T>::IsBuiltIn, "This function only works for built-in types");
static constexpr int typeId = QtPrivate::BuiltinMetaType<T>::value;
return iface->typeId.loadRelaxed() == typeId;
}
template <typename FPointer>
inline bool checkMetaTypeFlagOrPointer(const QtPrivate::QMetaTypeInterface *iface, FPointer ptr, QMetaType::TypeFlag Flag)
{
// helper to the isXxxConstructible & isDestructible functions below: a
// meta type has the trait if the trait is trivial or we have the pointer
// to perform the operation
Q_ASSERT(!isInterfaceFor<void>(iface));
Q_ASSERT(iface->size);
return ptr != nullptr || (iface->flags & Flag) == 0;
}
inline bool isDefaultConstructible(const QtPrivate::QMetaTypeInterface *iface) noexcept
{
return checkMetaTypeFlagOrPointer(iface, iface->defaultCtr, QMetaType::NeedsConstruction);
}
inline bool isCopyConstructible(const QtPrivate::QMetaTypeInterface *iface) noexcept
{
return checkMetaTypeFlagOrPointer(iface, iface->copyCtr, QMetaType::NeedsCopyConstruction);
}
inline bool isMoveConstructible(const QtPrivate::QMetaTypeInterface *iface) noexcept
{
return checkMetaTypeFlagOrPointer(iface, iface->moveCtr, QMetaType::NeedsMoveConstruction);
}
inline bool isDestructible(const QtPrivate::QMetaTypeInterface *iface) noexcept
{
/* For metatypes of revision 1, the NeedsDestruction was set even for trivially
destructible types, but their dtor pointer would be null.
For that reason, we need the additional check here.
*/
return iface->revision < 1 ||
checkMetaTypeFlagOrPointer(iface, iface->dtor, QMetaType::NeedsDestruction);
}
inline void defaultConstruct(const QtPrivate::QMetaTypeInterface *iface, void *where)
{
Q_ASSERT(isDefaultConstructible(iface));
if (iface->defaultCtr)
iface->defaultCtr(iface, where);
else
memset(where, 0, iface->size);
}
inline void copyConstruct(const QtPrivate::QMetaTypeInterface *iface, void *where, const void *copy)
{
Q_ASSERT(isCopyConstructible(iface));
if (iface->copyCtr)
iface->copyCtr(iface, where, copy);
else
memcpy(where, copy, iface->size);
}
inline void moveConstruct(const QtPrivate::QMetaTypeInterface *iface, void *where, void *copy)
{
Q_ASSERT(isMoveConstructible(iface));
if (iface->moveCtr)
iface->moveCtr(iface, where, copy);
else
memcpy(where, copy, iface->size);
}
inline void construct(const QtPrivate::QMetaTypeInterface *iface, void *where, const void *copy)
{
if (copy)
copyConstruct(iface, where, copy);
else
defaultConstruct(iface, where);
}
inline void destruct(const QtPrivate::QMetaTypeInterface *iface, void *where)
{
Q_ASSERT(isDestructible(iface));
if (iface->dtor)
iface->dtor(iface, where);
}
const char *typedefNameForType(const QtPrivate::QMetaTypeInterface *type_d);
template<typename T>
static const QT_PREPEND_NAMESPACE(QtPrivate::QMetaTypeInterface) *getInterfaceFromType()
{
if constexpr (QtMetaTypePrivate::TypeDefinition<T>::IsAvailable) {
return &QT_PREPEND_NAMESPACE(QtPrivate::QMetaTypeInterfaceWrapper)<T>::metaType;
}
return nullptr;
}
#define QT_METATYPE_CONVERT_ID_TO_TYPE(MetaTypeName, MetaTypeId, RealName) \
case QMetaType::MetaTypeName: \
return QtMetaTypePrivate::getInterfaceFromType<RealName>();
} //namespace QtMetaTypePrivate
QT_END_NAMESPACE
#endif // QMETATYPE_P_H
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