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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtCore module of the Qt Toolkit. |
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| ** |
| ** 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 |
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| ****************************************************************************/ |
| |
| #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 |