46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#ifndef Q_QDOC
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#ifndef QOBJECT_H
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#error Do not include qobject_impl.h directly
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#endif
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#if 0
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#pragma qt_sync_skip_header_check
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#pragma qt_sync_stop_processing
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#endif
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QT_BEGIN_NAMESPACE
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namespace QtPrivate {
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/*
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Logic to statically generate the array of qMetaTypeId
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ConnectionTypes<FunctionPointer<Signal>::Arguments>::types() returns an array
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of int that is suitable for the types arguments of the connection functions.
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The array only exist of all the types are declared as a metatype
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(detected using the TypesAreDeclaredMetaType helper struct)
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If one of the type is not declared, the function return 0 and the signal
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cannot be used in queued connection.
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*/
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template <typename ArgList> struct TypesAreDeclaredMetaType { enum { Value = false }; };
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template <> struct TypesAreDeclaredMetaType<List<>> { enum { Value = true }; };
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template <typename Arg, typename... Tail> struct TypesAreDeclaredMetaType<List<Arg, Tail...> >
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{ enum { Value = QMetaTypeId2<Arg>::Defined && TypesAreDeclaredMetaType<List<Tail...>>::Value }; };
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template <typename ArgList, bool Declared = TypesAreDeclaredMetaType<ArgList>::Value > struct ConnectionTypes
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{ static const int *types() { return nullptr; } };
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template <> struct ConnectionTypes<List<>, true>
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{ static const int *types() { return nullptr; } };
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template <typename... Args> struct ConnectionTypes<List<Args...>, true>
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{ static const int *types() { static const int t[sizeof...(Args) + 1] = { (QtPrivate::QMetaTypeIdHelper<Args>::qt_metatype_id())..., 0 }; return t; } };
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}
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QT_END_NAMESPACE
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#endif
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