mirror of
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208 lines
11 KiB
C++
208 lines
11 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://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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** $QT_BEGIN_LICENSE:LGPL21$
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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 http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://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 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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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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#ifndef Q_COMPILER_VARIADIC_TEMPLATES
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template <typename ArgList> struct TypesAreDeclaredMetaType { enum { Value = false }; };
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template <> struct TypesAreDeclaredMetaType<void> { enum { Value = true }; };
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template <typename Arg, typename Tail> struct TypesAreDeclaredMetaType<List<Arg, Tail> > { enum { Value = QMetaTypeId2<Arg>::Defined && TypesAreDeclaredMetaType<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 0; } };
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template <> struct ConnectionTypes<void, true>
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{ static const int *types() { static const int t[1] = { 0 }; return t; } };
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template <typename Arg1> struct ConnectionTypes<List<Arg1, void>, true>
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{ static const int *types() { static const int t[2] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), 0 }; return t; } };
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template <typename Arg1, typename Arg2> struct ConnectionTypes<List<Arg1, List<Arg2, void> >, true>
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{ static const int *types() { static const int t[3] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg2>::qt_metatype_id(), 0 }; return t; } };
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template <typename Arg1, typename Arg2, typename Arg3> struct ConnectionTypes<List<Arg1, List<Arg2, List<Arg3, void> > >, true>
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{ static const int *types() { static const int t[4] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg2>::qt_metatype_id(),
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QtPrivate::QMetaTypeIdHelper<Arg3>::qt_metatype_id(), 0 }; return t; } };
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template <typename Arg1, typename Arg2, typename Arg3, typename Arg4> struct ConnectionTypes<List<Arg1, List<Arg2, List<Arg3, List<Arg4, void> > > >, true>
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{ static const int *types() { static const int t[5] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg2>::qt_metatype_id(),
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QtPrivate::QMetaTypeIdHelper<Arg3>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg4>::qt_metatype_id(), 0 }; return t; } };
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template <typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5> struct ConnectionTypes<List<Arg1, List<Arg2, List<Arg3, List<Arg4, List<Arg5, void> > > > >, true>
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{ static const int *types() { static const int t[6] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg2>::qt_metatype_id(),
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QtPrivate::QMetaTypeIdHelper<Arg3>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg4>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg5>::qt_metatype_id(), 0 }; return t; } };
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template <typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5, typename Arg6>
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struct ConnectionTypes<List<Arg1, List<Arg2, List<Arg3, List<Arg4, List<Arg5, List<Arg6, void> > > > > >, true>
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{ static const int *types() { static const int t[7] = { QtPrivate::QMetaTypeIdHelper<Arg1>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg2>::qt_metatype_id(),
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QtPrivate::QMetaTypeIdHelper<Arg3>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg4>::qt_metatype_id(), QtPrivate::QMetaTypeIdHelper<Arg5>::qt_metatype_id(),
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QtPrivate::QMetaTypeIdHelper<Arg6>::qt_metatype_id(), 0 }; return t; } };
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#else
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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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#endif
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// internal base class (interface) containing functions required to call a slot managed by a pointer to function.
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class QSlotObjectBase {
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QAtomicInt m_ref;
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// don't use virtual functions here; we don't want the
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// compiler to create tons of per-polymorphic-class stuff that
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// we'll never need. We just use one function pointer.
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typedef void (*ImplFn)(int which, QSlotObjectBase* this_, QObject *receiver, void **args, bool *ret);
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const ImplFn m_impl;
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protected:
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enum Operation {
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Destroy,
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Call,
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Compare,
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NumOperations
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};
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public:
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explicit QSlotObjectBase(ImplFn fn) : m_ref(1), m_impl(fn) {}
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inline int ref() Q_DECL_NOTHROW { return m_ref.ref(); }
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inline void destroyIfLastRef() Q_DECL_NOTHROW
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{ if (!m_ref.deref()) m_impl(Destroy, this, Q_NULLPTR, Q_NULLPTR, Q_NULLPTR); }
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inline bool compare(void **a) { bool ret; m_impl(Compare, this, Q_NULLPTR, a, &ret); return ret; }
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inline void call(QObject *r, void **a) { m_impl(Call, this, r, a, Q_NULLPTR); }
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protected:
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~QSlotObjectBase() {}
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private:
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Q_DISABLE_COPY(QSlotObjectBase)
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};
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// implementation of QSlotObjectBase for which the slot is a pointer to member function of a QObject
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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 QSlotObject : 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<QSlotObject*>(this_);
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break;
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case Call:
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FuncType::template call<Args, R>(static_cast<QSlotObject*>(this_)->function, static_cast<typename FuncType::Object *>(r), a);
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break;
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case Compare:
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*ret = *reinterpret_cast<Func *>(a) == static_cast<QSlotObject*>(this_)->function;
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break;
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case NumOperations: ;
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}
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}
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public:
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explicit QSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
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};
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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:
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*ret = false; // not implemented
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break;
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case NumOperations: ;
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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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// implementation of QSlotObjectBase for which the slot is a functor (or lambda)
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// N is the number of arguments
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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, int N, typename Args, typename R> class QFunctorSlotObject : public QSlotObjectBase
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{
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typedef QtPrivate::Functor<Func, N> 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<QFunctorSlotObject*>(this_);
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break;
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case Call:
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FuncType::template call<Args, R>(static_cast<QFunctorSlotObject*>(this_)->function, r, a);
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break;
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case Compare:
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*ret = false; // not implemented
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break;
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case NumOperations: ;
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}
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}
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public:
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explicit QFunctorSlotObject(const 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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