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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QNATIVEINTERFACE_H
#define QNATIVEINTERFACE_H
#include <QtCore/qglobal.h>
#include <QtCore/qloggingcategory.h>
#ifndef QT_STATIC
# define Q_NATIVE_INTERFACE_EXPORT Q_DECL_EXPORT
# define Q_NATIVE_INTERFACE_IMPORT Q_DECL_IMPORT
#else
# define Q_NATIVE_INTERFACE_EXPORT
# define Q_NATIVE_INTERFACE_IMPORT
#endif
QT_BEGIN_NAMESPACE
// We declare a virtual non-inline function in the form
// of the destructor, making it the key function. This
// ensures that the typeinfo of the class is exported.
// By being protected, we also ensure that pointers to
// the interface can't be deleted.
#define QT_DECLARE_NATIVE_INTERFACE_3(NativeInterface, Revision, BaseType) \
protected: \
virtual ~NativeInterface(); \
struct TypeInfo { \
using baseType = BaseType; \
static constexpr char const *name = QT_STRINGIFY(NativeInterface); \
static constexpr int revision = Revision; \
}; \
public: \
// Revisioned interfaces only make sense when exposed through a base
// type via QT_DECLARE_NATIVE_INTERFACE_ACCESSOR, as the revision
// checks happen at that level (and not for normal dynamic_casts).
#define QT_DECLARE_NATIVE_INTERFACE_2(NativeInterface, Revision) \
static_assert(false, "Must provide a base type when specifying revision");
#define QT_DECLARE_NATIVE_INTERFACE_1(NativeInterface) \
QT_DECLARE_NATIVE_INTERFACE_3(NativeInterface, 0, void)
#define QT_DECLARE_NATIVE_INTERFACE(...) \
QT_OVERLOADED_MACRO(QT_DECLARE_NATIVE_INTERFACE, __VA_ARGS__)
namespace QNativeInterface::Private {
template <typename NativeInterface>
struct TypeInfo : private NativeInterface
{
static constexpr char const *name() { return NativeInterface::TypeInfo::name; }
static constexpr int revision() { return NativeInterface::TypeInfo::revision; }
template<typename BaseType>
static constexpr bool isCompatibleWith =
std::is_base_of<typename NativeInterface::TypeInfo::baseType, BaseType>::value;
};
template <typename T>
Q_NATIVE_INTERFACE_IMPORT void *resolveInterface(const T *that, const char *name, int revision);
Q_CORE_EXPORT Q_DECLARE_LOGGING_CATEGORY(lcNativeInterface)
}
// Declares an accessor for the native interface
#define QT_DECLARE_NATIVE_INTERFACE_ACCESSOR \
template <typename I> \
I *nativeInterface() const \
{ \
using T = std::decay_t<decltype(*this)>; \
using NativeInterface = QNativeInterface::Private::TypeInfo<I>; \
static_assert(NativeInterface::template isCompatibleWith<T>, \
"T::nativeInterface<I>() requires that native interface I is compatible with T"); \
\
return static_cast<I*>(QNativeInterface::Private::resolveInterface(this, \
NativeInterface::name(), NativeInterface::revision())); \
}
// Provides a definition for the interface destructor
#define QT_DEFINE_NATIVE_INTERFACE_2(Namespace, InterfaceClass) \
QT_PREPEND_NAMESPACE(Namespace)::InterfaceClass::~InterfaceClass() = default
#define QT_DEFINE_NATIVE_INTERFACE(...) QT_OVERLOADED_MACRO(QT_DEFINE_NATIVE_INTERFACE, QNativeInterface, __VA_ARGS__)
#define QT_DEFINE_PRIVATE_NATIVE_INTERFACE(...) QT_OVERLOADED_MACRO(QT_DEFINE_NATIVE_INTERFACE, QNativeInterface::Private, __VA_ARGS__)
#define QT_NATIVE_INTERFACE_RETURN_IF(NativeInterface, baseType) \
using QNativeInterface::Private::lcNativeInterface; \
qCDebug(lcNativeInterface, "Comparing requested interface name %s with available %s", \
name, TypeInfo<NativeInterface>::name()); \
if (qstrcmp(name, TypeInfo<NativeInterface>::name()) == 0) { \
qCDebug(lcNativeInterface, "Match for interface %s. Comparing revisions (requested %d / available %d)", \
name, revision, TypeInfo<NativeInterface>::revision()); \
if (revision == TypeInfo<NativeInterface>::revision()) { \
qCDebug(lcNativeInterface) << "Full match. Returning dynamic cast of" << baseType; \
return dynamic_cast<NativeInterface*>(baseType); \
} else { \
qCWarning(lcNativeInterface, "Native interface revision mismatch (requested %d / available %d) for interface %s", \
revision, TypeInfo<NativeInterface>::revision(), name); \
return nullptr; \
} \
}
QT_END_NAMESPACE
#endif // QNATIVEINTERFACE_H
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