106 lines
4.5 KiB
C++
106 lines
4.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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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 Q_NULLPTR; } };
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template <> struct ConnectionTypes<List<>, true>
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{ static const int *types() { return Q_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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// implementation of QSlotObjectBase for which the slot is a static function
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// Args and R are the List of arguments and the returntype of the signal to which the slot is connected.
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template<typename Func, typename Args, typename R> class QStaticSlotObject : public QSlotObjectBase
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{
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typedef QtPrivate::FunctionPointer<Func> FuncType;
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Func function;
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static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
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{
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switch (which) {
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case Destroy:
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delete static_cast<QStaticSlotObject*>(this_);
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break;
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case Call:
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FuncType::template call<Args, R>(static_cast<QStaticSlotObject*>(this_)->function, r, a);
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break;
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case Compare: // not implemented
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case NumOperations:
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Q_UNUSED(ret);
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}
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}
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public:
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explicit QStaticSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
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};
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}
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QT_END_NAMESPACE
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#endif
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