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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 Q_QDOC
#ifndef QOBJECT_H
#error Do not include qobject_impl.h directly
#endif
#if 0
#pragma qt_sync_skip_header_check
#pragma qt_sync_stop_processing
#endif
QT_BEGIN_NAMESPACE
namespace QtPrivate {
/*
Logic to statically generate the array of qMetaTypeId
ConnectionTypes<FunctionPointer<Signal>::Arguments>::types() returns an array
of int that is suitable for the types arguments of the connection functions.
The array only exist of all the types are declared as a metatype
(detected using the TypesAreDeclaredMetaType helper struct)
If one of the type is not declared, the function return 0 and the signal
cannot be used in queued connection.
*/
template <typename ArgList> struct TypesAreDeclaredMetaType { enum { Value = false }; };
template <> struct TypesAreDeclaredMetaType<List<>> { enum { Value = true }; };
template <typename Arg, typename... Tail> struct TypesAreDeclaredMetaType<List<Arg, Tail...> >
{ enum { Value = QMetaTypeId2<Arg>::Defined && TypesAreDeclaredMetaType<List<Tail...>>::Value }; };
template <typename ArgList, bool Declared = TypesAreDeclaredMetaType<ArgList>::Value > struct ConnectionTypes
{ static const int *types() { return nullptr; } };
template <> struct ConnectionTypes<List<>, true>
{ static const int *types() { return nullptr; } };
template <typename... Args> struct ConnectionTypes<List<Args...>, true>
{ static const int *types() { static const int t[sizeof...(Args) + 1] = { (QtPrivate::QMetaTypeIdHelper<Args>::qt_metatype_id())..., 0 }; return t; } };
// implementation of QSlotObjectBase for which the slot is a static function
// Args and R are the List of arguments and the return type of the signal to which the slot is connected.
template<typename Func, typename Args, typename R> class QStaticSlotObject : public QSlotObjectBase
{
typedef QtPrivate::FunctionPointer<Func> FuncType;
Func function;
static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
{
switch (which) {
case Destroy:
delete static_cast<QStaticSlotObject*>(this_);
break;
case Call:
FuncType::template call<Args, R>(static_cast<QStaticSlotObject*>(this_)->function, r, a);
break;
case Compare: // not implemented
case NumOperations:
Q_UNUSED(ret);
}
}
public:
explicit QStaticSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
};
}
QT_END_NAMESPACE
#endif
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