common/include/QtCore/qobject.h

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2013 Olivier Goffart <ogoffart@woboq.com>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QOBJECT_H
#define QOBJECT_H

#ifndef QT_NO_QOBJECT

#include <QtCore/qobjectdefs.h>
#include <QtCore/qstring.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qlist.h>
#ifdef QT_INCLUDE_COMPAT
#include <QtCore/qcoreevent.h>
#endif
#include <QtCore/qscopedpointer.h>
#include <QtCore/qmetatype.h>

#include <QtCore/qobject_impl.h>

QT_BEGIN_NAMESPACE


class QEvent;
class QTimerEvent;
class QChildEvent;
struct QMetaObject;
class QVariant;
class QObjectPrivate;
class QObject;
class QThread;
class QWidget;
#ifndef QT_NO_REGEXP
class QRegExp;
#endif
#ifndef QT_NO_REGULAREXPRESSION
class QRegularExpression;
#endif
#ifndef QT_NO_USERDATA
class QObjectUserData;
#endif
struct QDynamicMetaObjectData;

typedef QList<QObject*> QObjectList;

Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QString &name,
                                           const QMetaObject &mo, QList<void *> *list, Qt::FindChildOptions options);
Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QRegExp &re,
                                           const QMetaObject &mo, QList<void *> *list, Qt::FindChildOptions options);
Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QRegularExpression &re,
                                           const QMetaObject &mo, QList<void *> *list, Qt::FindChildOptions options);
Q_CORE_EXPORT QObject *qt_qFindChild_helper(const QObject *parent, const QString &name, const QMetaObject &mo, Qt::FindChildOptions options);

class Q_CORE_EXPORT QObjectData {
public:
    virtual ~QObjectData() = 0;
    QObject *q_ptr;
    QObject *parent;
    QObjectList children;

    uint isWidget : 1;
    uint blockSig : 1;
    uint wasDeleted : 1;
    uint isDeletingChildren : 1;
    uint sendChildEvents : 1;
    uint receiveChildEvents : 1;
    uint isWindow : 1; //for QWindow
    uint unused : 25;
    int postedEvents;
    QDynamicMetaObjectData *metaObject;
    QMetaObject *dynamicMetaObject() const;
};


class Q_CORE_EXPORT QObject
{
    Q_OBJECT
    Q_PROPERTY(QString objectName READ objectName WRITE setObjectName NOTIFY objectNameChanged)
    Q_DECLARE_PRIVATE(QObject)

public:
    Q_INVOKABLE explicit QObject(QObject *parent=0);
    virtual ~QObject();

    virtual bool event(QEvent *);
    virtual bool eventFilter(QObject *, QEvent *);

#ifdef Q_QDOC
    static QString tr(const char *sourceText, const char *comment = 0, int n = -1);
    static QString trUtf8(const char *sourceText, const char *comment = 0, int n = -1);
    virtual const QMetaObject *metaObject() const;
    static const QMetaObject staticMetaObject;
#endif
#ifdef QT_NO_TRANSLATION
    static QString tr(const char *sourceText, const char * = 0, int = -1)
        { return QString::fromUtf8(sourceText); }
#if QT_DEPRECATED_SINCE(5, 0)
    QT_DEPRECATED static QString trUtf8(const char *sourceText, const char * = 0, int = -1)
        { return QString::fromUtf8(sourceText); }
#endif
#endif //QT_NO_TRANSLATION

    QString objectName() const;
    void setObjectName(const QString &name);

    inline bool isWidgetType() const { return d_ptr->isWidget; }
    inline bool isWindowType() const { return d_ptr->isWindow; }

    inline bool signalsBlocked() const Q_DECL_NOTHROW { return d_ptr->blockSig; }
    bool blockSignals(bool b) Q_DECL_NOTHROW;

    QThread *thread() const;
    void moveToThread(QThread *thread);

    int startTimer(int interval, Qt::TimerType timerType = Qt::CoarseTimer);
    void killTimer(int id);

    template<typename T>
    inline T findChild(const QString &aName = QString(), Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
    {
        typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
        return static_cast<T>(qt_qFindChild_helper(this, aName, ObjType::staticMetaObject, options));
    }

    template<typename T>
    inline QList<T> findChildren(const QString &aName = QString(), Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
    {
        typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
        QList<T> list;
        qt_qFindChildren_helper(this, aName, ObjType::staticMetaObject,
                                reinterpret_cast<QList<void *> *>(&list), options);
        return list;
    }

#ifndef QT_NO_REGEXP
    template<typename T>
    inline QList<T> findChildren(const QRegExp &re, Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
    {
        typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
        QList<T> list;
        qt_qFindChildren_helper(this, re, ObjType::staticMetaObject,
                                reinterpret_cast<QList<void *> *>(&list), options);
        return list;
    }
#endif

#ifndef QT_NO_REGULAREXPRESSION
    template<typename T>
    inline QList<T> findChildren(const QRegularExpression &re, Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
    {
        typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
        QList<T> list;
        qt_qFindChildren_helper(this, re, ObjType::staticMetaObject,
                                reinterpret_cast<QList<void *> *>(&list), options);
        return list;
    }
#endif

    inline const QObjectList &children() const { return d_ptr->children; }

    void setParent(QObject *);
    void installEventFilter(QObject *);
    void removeEventFilter(QObject *);

    static QMetaObject::Connection connect(const QObject *sender, const char *signal,
                        const QObject *receiver, const char *member, Qt::ConnectionType = Qt::AutoConnection);

    static QMetaObject::Connection connect(const QObject *sender, const QMetaMethod &signal,
                        const QObject *receiver, const QMetaMethod &method,
                        Qt::ConnectionType type = Qt::AutoConnection);

    inline QMetaObject::Connection connect(const QObject *sender, const char *signal,
                        const char *member, Qt::ConnectionType type = Qt::AutoConnection) const;

#ifdef Q_QDOC
    static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type = Qt::AutoConnection);
    static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, Functor functor);
    static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type = Qt::AutoConnection);
#else
    //Connect a signal to a pointer to qobject member function
    template <typename Func1, typename Func2>
    static inline QMetaObject::Connection connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
                                     const typename QtPrivate::FunctionPointer<Func2>::Object *receiver, Func2 slot,
                                     Qt::ConnectionType type = Qt::AutoConnection)
    {
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        typedef QtPrivate::FunctionPointer<Func2> SlotType;

        Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                          "No Q_OBJECT in the class with the signal");

        //compilation error if the arguments does not match.
        Q_STATIC_ASSERT_X(int(SignalType::ArgumentCount) >= int(SlotType::ArgumentCount),
                          "The slot requires more arguments than the signal provides.");
        Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                          "Signal and slot arguments are not compatible.");
        Q_STATIC_ASSERT_X((QtPrivate::AreArgumentsCompatible<typename SlotType::ReturnType, typename SignalType::ReturnType>::value),
                          "Return type of the slot is not compatible with the return type of the signal.");

        const int *types = 0;
        if (type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
            types = QtPrivate::ConnectionTypes<typename SignalType::Arguments>::types();

        return connectImpl(sender, reinterpret_cast<void **>(&signal),
                           receiver, reinterpret_cast<void **>(&slot),
                           new QtPrivate::QSlotObject<Func2, typename QtPrivate::List_Left<typename SignalType::Arguments, SlotType::ArgumentCount>::Value,
                                           typename SignalType::ReturnType>(slot),
                            type, types, &SignalType::Object::staticMetaObject);
    }

    //connect to a function pointer  (not a member)
    template <typename Func1, typename Func2>
    static inline typename QtPrivate::QEnableIf<int(QtPrivate::FunctionPointer<Func2>::ArgumentCount) >= 0, QMetaObject::Connection>::Type
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, Func2 slot)
    {
        return connect(sender, signal, sender, slot, Qt::DirectConnection);
    }

    //connect to a function pointer  (not a member)
    template <typename Func1, typename Func2>
    static inline typename QtPrivate::QEnableIf<int(QtPrivate::FunctionPointer<Func2>::ArgumentCount) >= 0 &&
                                                !QtPrivate::FunctionPointer<Func2>::IsPointerToMemberFunction, QMetaObject::Connection>::Type
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const QObject *context, Func2 slot,
                    Qt::ConnectionType type = Qt::AutoConnection)
    {
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        typedef QtPrivate::FunctionPointer<Func2> SlotType;

        Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                          "No Q_OBJECT in the class with the signal");

        //compilation error if the arguments does not match.
        Q_STATIC_ASSERT_X(int(SignalType::ArgumentCount) >= int(SlotType::ArgumentCount),
                          "The slot requires more arguments than the signal provides.");
        Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                          "Signal and slot arguments are not compatible.");
        Q_STATIC_ASSERT_X((QtPrivate::AreArgumentsCompatible<typename SlotType::ReturnType, typename SignalType::ReturnType>::value),
                          "Return type of the slot is not compatible with the return type of the signal.");

        const int *types = 0;
        if (type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
            types = QtPrivate::ConnectionTypes<typename SignalType::Arguments>::types();

        return connectImpl(sender, reinterpret_cast<void **>(&signal), context, 0,
                           new QtPrivate::QStaticSlotObject<Func2,
                                                 typename QtPrivate::List_Left<typename SignalType::Arguments, SlotType::ArgumentCount>::Value,
                                                 typename SignalType::ReturnType>(slot),
                           type, types, &SignalType::Object::staticMetaObject);
    }

    //connect to a functor
    template <typename Func1, typename Func2>
    static inline typename QtPrivate::QEnableIf<QtPrivate::FunctionPointer<Func2>::ArgumentCount == -1, QMetaObject::Connection>::Type
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, Func2 slot)
    {
        return connect(sender, signal, sender, slot, Qt::DirectConnection);
    }

    //connect to a functor, with a "context" object defining in which event loop is going to be executed
    template <typename Func1, typename Func2>
    static inline typename QtPrivate::QEnableIf<QtPrivate::FunctionPointer<Func2>::ArgumentCount == -1, QMetaObject::Connection>::Type
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const QObject *context, Func2 slot,
                    Qt::ConnectionType type = Qt::AutoConnection)
    {
#if defined (Q_COMPILER_DECLTYPE) && defined (Q_COMPILER_VARIADIC_TEMPLATES)
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        const int FunctorArgumentCount = QtPrivate::ComputeFunctorArgumentCount<Func2 , typename SignalType::Arguments>::Value;

        Q_STATIC_ASSERT_X((FunctorArgumentCount >= 0),
                          "Signal and slot arguments are not compatible.");
        const int SlotArgumentCount = (FunctorArgumentCount >= 0) ? FunctorArgumentCount : 0;
        typedef typename QtPrivate::FunctorReturnType<Func2, typename QtPrivate::List_Left<typename SignalType::Arguments, SlotArgumentCount>::Value>::Value SlotReturnType;
#else
      // Without variadic template, we don't detect the best overload of operator(). We just
      // assume there is only one simple operator() and connect to &Func2::operator()

      /* If you get an error such as:
             couldn't deduce template parameter 'Func2Operator'
        or
             cannot resolve address of overloaded function
        It means the functor does not have a single operator().
        Functors with overloaded or templated operator() are only supported if the compiler supports
        C++11 variadic templates
      */
#ifndef Q_COMPILER_DECLTYPE  //Workaround the lack of decltype using another function as indirection
        return connect_functor(sender, signal, context, slot, &Func2::operator(), type); }
    template <typename Func1, typename Func2, typename Func2Operator>
    static inline QMetaObject::Connection connect_functor(const QObject *sender, Func1 signal, const QObject *context,
                                                          Func2 slot, Func2Operator, Qt::ConnectionType type) {
        typedef QtPrivate::FunctionPointer<Func2Operator> SlotType ;
#else
        typedef QtPrivate::FunctionPointer<decltype(&Func2::operator())> SlotType ;
#endif
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        typedef typename SlotType::ReturnType SlotReturnType;
        const int SlotArgumentCount = SlotType::ArgumentCount;

        Q_STATIC_ASSERT_X(int(SignalType::ArgumentCount) >= SlotArgumentCount,
                          "The slot requires more arguments than the signal provides.");
        Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                          "Signal and slot arguments are not compatible.");
#endif

        Q_STATIC_ASSERT_X((QtPrivate::AreArgumentsCompatible<SlotReturnType, typename SignalType::ReturnType>::value),
                          "Return type of the slot is not compatible with the return type of the signal.");

        Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                          "No Q_OBJECT in the class with the signal");

        const int *types = 0;
        if (type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
            types = QtPrivate::ConnectionTypes<typename SignalType::Arguments>::types();

        return connectImpl(sender, reinterpret_cast<void **>(&signal), context, 0,
                           new QtPrivate::QFunctorSlotObject<Func2, SlotArgumentCount,
                                typename QtPrivate::List_Left<typename SignalType::Arguments, SlotArgumentCount>::Value,
                                typename SignalType::ReturnType>(slot),
                           type, types, &SignalType::Object::staticMetaObject);
    }
#endif //Q_QDOC

    static bool disconnect(const QObject *sender, const char *signal,
                           const QObject *receiver, const char *member);
    static bool disconnect(const QObject *sender, const QMetaMethod &signal,
                           const QObject *receiver, const QMetaMethod &member);
    inline bool disconnect(const char *signal = 0,
                           const QObject *receiver = 0, const char *member = 0) const
        { return disconnect(this, signal, receiver, member); }
    inline bool disconnect(const QObject *receiver, const char *member = 0) const
        { return disconnect(this, 0, receiver, member); }
    static bool disconnect(const QMetaObject::Connection &);

#ifdef Q_QDOC
    static bool disconnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method);
#else
    template <typename Func1, typename Func2>
    static inline bool disconnect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
                                  const typename QtPrivate::FunctionPointer<Func2>::Object *receiver, Func2 slot)
    {
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        typedef QtPrivate::FunctionPointer<Func2> SlotType;

        Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                          "No Q_OBJECT in the class with the signal");

        //compilation error if the arguments does not match.
        Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                          "Signal and slot arguments are not compatible.");

        return disconnectImpl(sender, reinterpret_cast<void **>(&signal), receiver, reinterpret_cast<void **>(&slot),
                              &SignalType::Object::staticMetaObject);
    }
    template <typename Func1>
    static inline bool disconnect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
                                  const QObject *receiver, void **zero)
    {
        // This is the overload for when one wish to disconnect a signal from any slot. (slot=0)
        // Since the function template parameter cannot be deduced from '0', we use a
        // dummy void ** parameter that must be equal to 0
        Q_ASSERT(!zero);
        typedef QtPrivate::FunctionPointer<Func1> SignalType;
        return disconnectImpl(sender, reinterpret_cast<void **>(&signal), receiver, zero,
                              &SignalType::Object::staticMetaObject);
    }
#endif //Q_QDOC


    void dumpObjectTree();
    void dumpObjectInfo();

#ifndef QT_NO_PROPERTIES
    bool setProperty(const char *name, const QVariant &value);
    QVariant property(const char *name) const;
    QList<QByteArray> dynamicPropertyNames() const;
#endif // QT_NO_PROPERTIES

#ifndef QT_NO_USERDATA
    static uint registerUserData();
    void setUserData(uint id, QObjectUserData* data);
    QObjectUserData* userData(uint id) const;
#endif // QT_NO_USERDATA

Q_SIGNALS:
    void destroyed(QObject * = 0);
    void objectNameChanged(const QString &objectName, QPrivateSignal);

public:
    inline QObject *parent() const { return d_ptr->parent; }

    inline bool inherits(const char *classname) const
        { return const_cast<QObject *>(this)->qt_metacast(classname) != 0; }

public Q_SLOTS:
    void deleteLater();

protected:
    QObject *sender() const;
    int senderSignalIndex() const;
    int receivers(const char* signal) const;
    bool isSignalConnected(const QMetaMethod &signal) const;

    virtual void timerEvent(QTimerEvent *);
    virtual void childEvent(QChildEvent *);
    virtual void customEvent(QEvent *);

    virtual void connectNotify(const QMetaMethod &signal);
    virtual void disconnectNotify(const QMetaMethod &signal);

protected:
    QObject(QObjectPrivate &dd, QObject *parent = 0);

protected:
    QScopedPointer<QObjectData> d_ptr;

    static const QMetaObject staticQtMetaObject;
    friend inline const QMetaObject *qt_getQtMetaObject() Q_DECL_NOEXCEPT
    { return &staticQtMetaObject; }

    friend struct QMetaObject;
    friend struct QMetaObjectPrivate;
    friend class QMetaCallEvent;
    friend class QApplication;
    friend class QApplicationPrivate;
    friend class QCoreApplication;
    friend class QCoreApplicationPrivate;
    friend class QWidget;
    friend class QThreadData;

private:
    Q_DISABLE_COPY(QObject)
    Q_PRIVATE_SLOT(d_func(), void _q_reregisterTimers(void *))

private:
    static QMetaObject::Connection connectImpl(const QObject *sender, void **signal,
                                               const QObject *receiver, void **slotPtr,
                                               QtPrivate::QSlotObjectBase *slot, Qt::ConnectionType type,
                                               const int *types, const QMetaObject *senderMetaObject);

    static bool disconnectImpl(const QObject *sender, void **signal, const QObject *receiver, void **slot,
                               const QMetaObject *senderMetaObject);

};

inline QMetaObject::Connection QObject::connect(const QObject *asender, const char *asignal,
                                            const char *amember, Qt::ConnectionType atype) const
{ return connect(asender, asignal, this, amember, atype); }

#ifndef QT_NO_USERDATA
class Q_CORE_EXPORT QObjectUserData {
public:
    virtual ~QObjectUserData();
};
#endif

#ifdef Q_QDOC
T qFindChild(const QObject *o, const QString &name = QString());
QList<T> qFindChildren(const QObject *oobj, const QString &name = QString());
QList<T> qFindChildren(const QObject *o, const QRegExp &re);
#endif
#if QT_DEPRECATED_SINCE(5, 0)
template<typename T>
inline QT_DEPRECATED T qFindChild(const QObject *o, const QString &name = QString())
{ return o->findChild<T>(name); }

template<typename T>
inline QT_DEPRECATED QList<T> qFindChildren(const QObject *o, const QString &name = QString())
{
    return o->findChildren<T>(name);
}

#ifndef QT_NO_REGEXP
template<typename T>
inline QT_DEPRECATED QList<T> qFindChildren(const QObject *o, const QRegExp &re)
{
    return o->findChildren<T>(re);
}
#endif

#endif //QT_DEPRECATED

template <class T>
inline T qobject_cast(QObject *object)
{
    typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
    Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
                    "qobject_cast requires the type to have a Q_OBJECT macro");
    return static_cast<T>(ObjType::staticMetaObject.cast(object));
}

template <class T>
inline T qobject_cast(const QObject *object)
{
    typedef typename QtPrivate::remove_cv<typename QtPrivate::remove_pointer<T>::type>::type ObjType;
    Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
                      "qobject_cast requires the type to have a Q_OBJECT macro");
    return static_cast<T>(ObjType::staticMetaObject.cast(object));
}


template <class T> inline const char * qobject_interface_iid()
{ return 0; }

#ifndef Q_MOC_RUN
#  define Q_DECLARE_INTERFACE(IFace, IId) \
    template <> inline const char *qobject_interface_iid<IFace *>() \
    { return IId; } \
    template <> inline IFace *qobject_cast<IFace *>(QObject *object) \
    { return reinterpret_cast<IFace *>((object ? object->qt_metacast(IId) : 0)); } \
    template <> inline IFace *qobject_cast<IFace *>(const QObject *object) \
    { return reinterpret_cast<IFace *>((object ? const_cast<QObject *>(object)->qt_metacast(IId) : 0)); }
#endif // Q_MOC_RUN

#ifndef QT_NO_DEBUG_STREAM
Q_CORE_EXPORT QDebug operator<<(QDebug, const QObject *);
#endif

class QSignalBlocker
{
public:
    inline explicit QSignalBlocker(QObject *o) Q_DECL_NOTHROW;
    inline explicit QSignalBlocker(QObject &o) Q_DECL_NOTHROW;
    inline ~QSignalBlocker();

#ifdef Q_COMPILER_RVALUE_REFS
    inline QSignalBlocker(QSignalBlocker &&other) Q_DECL_NOTHROW;
    inline QSignalBlocker &operator=(QSignalBlocker &&other) Q_DECL_NOTHROW;
#endif

    inline void reblock() Q_DECL_NOTHROW;
    inline void unblock() Q_DECL_NOTHROW;
private:
    Q_DISABLE_COPY(QSignalBlocker)
    QObject * m_o;
    bool m_blocked;
    bool m_inhibited;
};

QSignalBlocker::QSignalBlocker(QObject *o) Q_DECL_NOTHROW
    : m_o(o),
      m_blocked(o && o->blockSignals(true)),
      m_inhibited(false)
{}

QSignalBlocker::QSignalBlocker(QObject &o) Q_DECL_NOTHROW
    : m_o(&o),
      m_blocked(o.blockSignals(true)),
      m_inhibited(false)
{}

#ifdef Q_COMPILER_RVALUE_REFS
QSignalBlocker::QSignalBlocker(QSignalBlocker &&other) Q_DECL_NOTHROW
    : m_o(other.m_o),
      m_blocked(other.m_blocked),
      m_inhibited(other.m_inhibited)
{
    other.m_o = 0;
}

QSignalBlocker &QSignalBlocker::operator=(QSignalBlocker &&other) Q_DECL_NOTHROW
{
    if (this != &other) {
        // if both *this and other block the same object's signals:
        // unblock *this iff our dtor would unblock, but other's wouldn't
        if (m_o != other.m_o || (!m_inhibited && other.m_inhibited))
            unblock();
        m_o = other.m_o;
        m_blocked = other.m_blocked;
        m_inhibited = other.m_inhibited;
        // disable other:
        other.m_o = 0;
    }
    return *this;
}
#endif

QSignalBlocker::~QSignalBlocker()
{
    if (m_o && !m_inhibited)
        m_o->blockSignals(m_blocked);
}

void QSignalBlocker::reblock() Q_DECL_NOTHROW
{
    if (m_o) m_o->blockSignals(true);
    m_inhibited = false;
}

void QSignalBlocker::unblock() Q_DECL_NOTHROW
{
    if (m_o) m_o->blockSignals(m_blocked);
    m_inhibited = true;
}

namespace QtPrivate {
    inline QObject & deref_for_methodcall(QObject &o) { return  o; }
    inline QObject & deref_for_methodcall(QObject *o) { return *o; }
}
#define Q_SET_OBJECT_NAME(obj) QT_PREPEND_NAMESPACE(QtPrivate)::deref_for_methodcall(obj).setObjectName(QLatin1String(#obj))

QT_END_NAMESPACE

#endif

#endif // QOBJECT_H