Line data    Source code

       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           0 :     { static const int *types() { return Q_NULLPTR; } };
      72             :     template <> struct ConnectionTypes<List<>, true>
      73           0 :     { static const int *types() { return Q_NULLPTR; } };
      74             :     template <typename... Args> struct ConnectionTypes<List<Args...>, true>
      75           0 :     { 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 returntype 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