1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtCore module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef Q_QDOC 41 42 #ifndef QOBJECT_H 43 #error Do not include qobject_impl.h directly 44 #endif 45 46 #if 0 47 #pragma qt_sync_skip_header_check 48 #pragma qt_sync_stop_processing 49 #endif 50 51 QT_BEGIN_NAMESPACE 52 53 54 namespace QtPrivate { 55 /* 56 Logic to statically generate the array of qMetaTypeId 57 ConnectionTypes<FunctionPointer<Signal>::Arguments>::types() returns an array 58 of int that is suitable for the types arguments of the connection functions. 59 60 The array only exist of all the types are declared as a metatype 61 (detected using the TypesAreDeclaredMetaType helper struct) 62 If one of the type is not declared, the function return 0 and the signal 63 cannot be used in queued connection. 64 */ 65 template <typename ArgList> struct TypesAreDeclaredMetaType { enum { Value = false }; }; 66 template <> struct TypesAreDeclaredMetaType<List<>> { enum { Value = true }; }; 67 template <typename Arg, typename... Tail> struct TypesAreDeclaredMetaType<List<Arg, Tail...> > 68 { enum { Value = QMetaTypeId2<Arg>::Defined && TypesAreDeclaredMetaType<List<Tail...>>::Value }; }; 69 70 template <typename ArgList, bool Declared = TypesAreDeclaredMetaType<ArgList>::Value > struct ConnectionTypes 71 { static const int *types() { return nullptr; } }; 72 template <> struct ConnectionTypes<List<>, true> 73 { static const int *types() { return nullptr; } }; 74 template <typename... Args> struct ConnectionTypes<List<Args...>, true> 75 { static const int *types() { static const int t[sizeof...(Args) + 1] = { (QtPrivate::QMetaTypeIdHelper<Args>::qt_metatype_id())..., 0 }; return t; } }; 76 77 // implementation of QSlotObjectBase for which the slot is a static function 78 // Args and R are the List of arguments and the return type of the signal to which the slot is connected. 79 template<typename Func, typename Args, typename R> class QStaticSlotObject : public QSlotObjectBase 80 { 81 typedef QtPrivate::FunctionPointer<Func> FuncType; 82 Func function; 83 static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret) 84 { 85 switch (which) { 86 case Destroy: 87 delete static_cast<QStaticSlotObject*>(this_); 88 break; 89 case Call: 90 FuncType::template call<Args, R>(static_cast<QStaticSlotObject*>(this_)->function, r, a); 91 break; 92 case Compare: // not implemented 93 case NumOperations: 94 Q_UNUSED(ret); 95 } 96 } 97 public: 98 explicit QStaticSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {} 99 }; 100 } 101 102 103 QT_END_NAMESPACE 104 105 #endif 106