1// Copyright (C) 2020 The Qt Company Ltd.
2// Copyright (C) 2013 Olivier Goffart <[email protected]>
3// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
4
5#ifndef QOBJECT_H
6#define QOBJECT_H
7
8#ifndef QT_NO_QOBJECT
9
10#include <QtCore/qobjectdefs.h>
11#include <QtCore/qstring.h>
12#include <QtCore/qbytearray.h>
13#include <QtCore/qlist.h>
14#ifdef QT_INCLUDE_COMPAT
15#include <QtCore/qcoreevent.h>
16#endif
17#include <QtCore/qscopedpointer.h>
18#include <QtCore/qmetatype.h>
19
20#include <QtCore/qobject_impl.h>
21#include <QtCore/qbindingstorage.h>
22#include <QtCore/qtcoreexports.h>
23
24#include <chrono>
25
26QT_BEGIN_NAMESPACE
27
28
29template <typename T> class QBindable;
30class QEvent;
31class QTimerEvent;
32class QChildEvent;
33struct QMetaObject;
34class QVariant;
35class QObjectPrivate;
36class QObject;
37class QThread;
38class QWidget;
39class QAccessibleWidget;
40#if QT_CONFIG(regularexpression)
41class QRegularExpression;
42#endif
43struct QDynamicMetaObjectData;
44
45typedef QList<QObject*> QObjectList;
46
47#if QT_CORE_REMOVED_SINCE(6, 7)
48Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QString &name,
49 const QMetaObject &mo, QList<void *> *list, Qt::FindChildOptions options);
50#endif
51Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, QAnyStringView name,
52 const QMetaObject &mo, QList<void *> *list,
53 Qt::FindChildOptions options);
54#if QT_CORE_REMOVED_SINCE(6, 7)
55Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QMetaObject &mo,
56 QList<void *> *list, Qt::FindChildOptions options);
57#endif
58Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QRegularExpression &re,
59 const QMetaObject &mo, QList<void *> *list, Qt::FindChildOptions options);
60#if QT_CORE_REMOVED_SINCE(6, 7)
61Q_CORE_EXPORT QObject *qt_qFindChild_helper(const QObject *parent, const QString &name, const QMetaObject &mo, Qt::FindChildOptions options);
62#endif
63Q_CORE_EXPORT QObject *qt_qFindChild_helper(const QObject *parent, QAnyStringView name,
64 const QMetaObject &mo, Qt::FindChildOptions options);
65
66class Q_CORE_EXPORT QObjectData
67{
68 Q_DISABLE_COPY(QObjectData)
69public:
70 QObjectData() = default;
71 virtual ~QObjectData() = 0;
72 QObject *q_ptr;
73 QObject *parent;
74 QObjectList children;
75
76 uint isWidget : 1;
77 uint blockSig : 1;
78 uint wasDeleted : 1;
79 uint isDeletingChildren : 1;
80 uint sendChildEvents : 1;
81 uint receiveChildEvents : 1;
82 uint isWindow : 1; // for QWindow
83 uint deleteLaterCalled : 1;
84 uint isQuickItem : 1;
85 uint willBeWidget : 1; // for handling widget-specific bits in QObject's ctor
86 uint wasWidget : 1; // for properly cleaning up in QObject's dtor
87 uint receiveParentEvents: 1;
88 uint unused : 20;
89 QAtomicInt postedEvents;
90 QDynamicMetaObjectData *metaObject;
91 QBindingStorage bindingStorage;
92
93 // ### Qt7: Make this return a const QMetaObject *. You should not mess with
94 // the metaobjects of existing objects.
95 QMetaObject *dynamicMetaObject() const;
96
97#ifdef QT_DEBUG
98 enum { CheckForParentChildLoopsWarnDepth = 4096 };
99#endif
100};
101
102class Q_CORE_EXPORT QObject
103{
104 Q_OBJECT
105
106 Q_PROPERTY(QString objectName READ objectName WRITE setObjectName NOTIFY objectNameChanged
107 BINDABLE bindableObjectName)
108 Q_DECLARE_PRIVATE(QObject)
109
110public:
111 Q_INVOKABLE explicit QObject(QObject *parent = nullptr);
112 virtual ~QObject();
113
114 virtual bool event(QEvent *event);
115 virtual bool eventFilter(QObject *watched, QEvent *event);
116
117#if defined(QT_NO_TRANSLATION) || defined(Q_QDOC)
118 static QString tr(const char *sourceText, const char * = nullptr, int = -1)
119 { return QString::fromUtf8(sourceText); }
120#endif // QT_NO_TRANSLATION
121
122 QString objectName() const;
123#if QT_CORE_REMOVED_SINCE(6, 4)
124 void setObjectName(const QString &name);
125#endif
126 Q_WEAK_OVERLOAD
127 void setObjectName(const QString &name) { doSetObjectName(name); }
128 void setObjectName(QAnyStringView name);
129 QBindable<QString> bindableObjectName();
130
131 inline bool isWidgetType() const { return d_ptr->isWidget; }
132 inline bool isWindowType() const { return d_ptr->isWindow; }
133 inline bool isQuickItemType() const { return d_ptr->isQuickItem; }
134
135 inline bool signalsBlocked() const noexcept { return d_ptr->blockSig; }
136 bool blockSignals(bool b) noexcept;
137
138 QThread *thread() const;
139#if QT_CORE_REMOVED_SINCE(6, 7)
140 void moveToThread(QThread *thread);
141#endif
142 bool moveToThread(QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL);
143
144 int startTimer(int interval, Qt::TimerType timerType = Qt::CoarseTimer);
145
146#if QT_CORE_REMOVED_SINCE(6, 8)
147 int startTimer(std::chrono::milliseconds time, Qt::TimerType timerType = Qt::CoarseTimer);
148#endif
149 int startTimer(std::chrono::nanoseconds time, Qt::TimerType timerType = Qt::CoarseTimer);
150
151 void killTimer(int id);
152 void killTimer(Qt::TimerId id);
153
154 template<typename T>
155 T findChild(QAnyStringView aName, Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
156 {
157 typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type ObjType;
158 static_assert(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
159 "No Q_OBJECT in the class passed to QObject::findChild");
160 return static_cast<T>(qt_qFindChild_helper(this, aName, ObjType::staticMetaObject, options));
161 }
162
163 template<typename T>
164 QList<T> findChildren(QAnyStringView aName, Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
165 {
166 typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type ObjType;
167 static_assert(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
168 "No Q_OBJECT in the class passed to QObject::findChildren");
169 QList<T> list;
170 qt_qFindChildren_helper(this, aName, ObjType::staticMetaObject,
171 reinterpret_cast<QList<void *> *>(&list), options);
172 return list;
173 }
174
175 template<typename T>
176 T findChild(Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
177 {
178 return findChild<T>({}, options);
179 }
180
181 template<typename T>
182 QList<T> findChildren(Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
183 {
184 return findChildren<T>(QAnyStringView{}, options);
185 }
186
187#if QT_CONFIG(regularexpression)
188 template<typename T>
189 inline QList<T> findChildren(const QRegularExpression &re, Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
190 {
191 typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type ObjType;
192 static_assert(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
193 "No Q_OBJECT in the class passed to QObject::findChildren");
194 QList<T> list;
195 qt_qFindChildren_helper(this, re, ObjType::staticMetaObject,
196 reinterpret_cast<QList<void *> *>(&list), options);
197 return list;
198 }
199#endif // QT_CONFIG(regularexpression)
200
201 inline const QObjectList &children() const { return d_ptr->children; }
202
203 void setParent(QObject *parent);
204 void installEventFilter(QObject *filterObj);
205 void removeEventFilter(QObject *obj);
206
207 static QMetaObject::Connection connect(const QObject *sender, const char *signal,
208 const QObject *receiver, const char *member, Qt::ConnectionType = Qt::AutoConnection);
209
210 static QMetaObject::Connection connect(const QObject *sender, const QMetaMethod &signal,
211 const QObject *receiver, const QMetaMethod &method,
212 Qt::ConnectionType type = Qt::AutoConnection);
213
214 inline QMetaObject::Connection connect(const QObject *sender, const char *signal,
215 const char *member, Qt::ConnectionType type = Qt::AutoConnection) const;
216
217#ifdef Q_QDOC
218 template<typename PointerToMemberFunction>
219 static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type = Qt::AutoConnection);
220 template<typename PointerToMemberFunction, typename Functor>
221 static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, Functor functor);
222 template<typename PointerToMemberFunction, typename Functor>
223 static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type = Qt::AutoConnection);
224#else
225 //connect with context
226 template <typename Func1, typename Func2>
227 static inline QMetaObject::Connection
228 connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
229 const typename QtPrivate::ContextTypeForFunctor<Func2>::ContextType *context, Func2 &&slot,
230 Qt::ConnectionType type = Qt::AutoConnection)
231 {
232 typedef QtPrivate::FunctionPointer<Func1> SignalType;
233 typedef QtPrivate::FunctionPointer<std::decay_t<Func2>> SlotType;
234
235 if constexpr (SlotType::ArgumentCount != -1) {
236 static_assert((QtPrivate::AreArgumentsCompatible<typename SlotType::ReturnType, typename SignalType::ReturnType>::value),
237 "Return type of the slot is not compatible with the return type of the signal.");
238 } else {
239 constexpr int FunctorArgumentCount = QtPrivate::ComputeFunctorArgumentCount<std::decay_t<Func2>, typename SignalType::Arguments>::Value;
240 [[maybe_unused]]
241 constexpr int SlotArgumentCount = (FunctorArgumentCount >= 0) ? FunctorArgumentCount : 0;
242 typedef typename QtPrivate::FunctorReturnType<std::decay_t<Func2>, typename QtPrivate::List_Left<typename SignalType::Arguments, SlotArgumentCount>::Value>::Value SlotReturnType;
243
244 static_assert((QtPrivate::AreArgumentsCompatible<SlotReturnType, typename SignalType::ReturnType>::value),
245 "Return type of the slot is not compatible with the return type of the signal.");
246 }
247
248 static_assert(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
249 "No Q_OBJECT in the class with the signal");
250
251 //compilation error if the arguments does not match.
252 static_assert(int(SignalType::ArgumentCount) >= int(SlotType::ArgumentCount),
253 "The slot requires more arguments than the signal provides.");
254
255 const int *types = nullptr;
256 if (type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
257 types = QtPrivate::ConnectionTypes<typename SignalType::Arguments>::types();
258
259 void **pSlot = nullptr;
260 if constexpr (std::is_member_function_pointer_v<std::decay_t<Func2>>) {
261 pSlot = const_cast<void **>(reinterpret_cast<void *const *>(&slot));
262 } else {
263 Q_ASSERT_X((type & Qt::UniqueConnection) == 0, "",
264 "QObject::connect: Unique connection requires the slot to be a pointer to "
265 "a member function of a QObject subclass.");
266 }
267
268 return connectImpl(sender, signal: reinterpret_cast<void **>(&signal), receiver: context, slotPtr: pSlot,
269 slot: QtPrivate::makeCallableObject<Func1>(std::forward<Func2>(slot)),
270 type, types, senderMetaObject: &SignalType::Object::staticMetaObject);
271 }
272
273#ifndef QT_NO_CONTEXTLESS_CONNECT
274 //connect without context
275 template <typename Func1, typename Func2>
276 static inline QMetaObject::Connection
277 connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, Func2 &&slot)
278 {
279 return connect(sender, signal, sender, std::forward<Func2>(slot), Qt::DirectConnection);
280 }
281#endif // QT_NO_CONTEXTLESS_CONNECT
282#endif //Q_QDOC
283
284 static bool disconnect(const QObject *sender, const char *signal,
285 const QObject *receiver, const char *member);
286 static bool disconnect(const QObject *sender, const QMetaMethod &signal,
287 const QObject *receiver, const QMetaMethod &member);
288 inline bool disconnect(const char *signal = nullptr,
289 const QObject *receiver = nullptr, const char *member = nullptr) const
290 { return disconnect(sender: this, signal, receiver, member); }
291 inline bool disconnect(const QObject *receiver, const char *member = nullptr) const
292 { return disconnect(sender: this, signal: nullptr, receiver, member); }
293 static bool disconnect(const QMetaObject::Connection &);
294
295#ifdef Q_QDOC
296 template<typename PointerToMemberFunction>
297 static bool disconnect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method);
298#else
299 template <typename Func1, typename Func2>
300 static inline bool disconnect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
301 const typename QtPrivate::FunctionPointer<Func2>::Object *receiver, Func2 slot)
302 {
303 typedef QtPrivate::FunctionPointer<Func1> SignalType;
304 typedef QtPrivate::FunctionPointer<Func2> SlotType;
305
306 static_assert(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
307 "No Q_OBJECT in the class with the signal");
308
309 //compilation error if the arguments does not match.
310 static_assert((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
311 "Signal and slot arguments are not compatible.");
312
313 return disconnectImpl(sender, signal: reinterpret_cast<void **>(&signal), receiver, slot: reinterpret_cast<void **>(&slot),
314 senderMetaObject: &SignalType::Object::staticMetaObject);
315 }
316 template <typename Func1>
317 static inline bool disconnect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
318 const QObject *receiver, void **zero)
319 {
320 // This is the overload for when one wish to disconnect a signal from any slot. (slot=nullptr)
321 // Since the function template parameter cannot be deduced from '0', we use a
322 // dummy void ** parameter that must be equal to 0
323 Q_ASSERT(!zero);
324 typedef QtPrivate::FunctionPointer<Func1> SignalType;
325 return disconnectImpl(sender, signal: reinterpret_cast<void **>(&signal), receiver, slot: zero,
326 senderMetaObject: &SignalType::Object::staticMetaObject);
327 }
328#endif //Q_QDOC
329
330 void dumpObjectTree() const;
331 void dumpObjectInfo() const;
332
333 QT_CORE_INLINE_SINCE(6, 6)
334 bool setProperty(const char *name, const QVariant &value);
335 inline bool setProperty(const char *name, QVariant &&value);
336 QVariant property(const char *name) const;
337 QList<QByteArray> dynamicPropertyNames() const;
338 QBindingStorage *bindingStorage() { return &d_ptr->bindingStorage; }
339 const QBindingStorage *bindingStorage() const { return &d_ptr->bindingStorage; }
340
341Q_SIGNALS:
342 void destroyed(QObject * = nullptr);
343 void objectNameChanged(const QString &objectName, QPrivateSignal);
344
345public:
346 inline QObject *parent() const { return d_ptr->parent; }
347
348 inline bool inherits(const char *classname) const
349 {
350 return const_cast<QObject *>(this)->qt_metacast(classname) != nullptr;
351 }
352
353public Q_SLOTS:
354 void deleteLater();
355
356protected:
357 QObject *sender() const;
358 int senderSignalIndex() const;
359 int receivers(const char *signal) const;
360 bool isSignalConnected(const QMetaMethod &signal) const;
361
362 virtual void timerEvent(QTimerEvent *event);
363 virtual void childEvent(QChildEvent *event);
364 virtual void customEvent(QEvent *event);
365
366 virtual void connectNotify(const QMetaMethod &signal);
367 virtual void disconnectNotify(const QMetaMethod &signal);
368
369protected:
370 QObject(QObjectPrivate &dd, QObject *parent = nullptr);
371
372protected:
373 QScopedPointer<QObjectData> d_ptr;
374
375 friend struct QMetaObject;
376 friend struct QMetaObjectPrivate;
377 friend class QMetaCallEvent;
378 friend class QApplication;
379 friend class QApplicationPrivate;
380 friend class QCoreApplication;
381 friend class QCoreApplicationPrivate;
382 friend class QWidget;
383 friend class QAccessibleWidget;
384 friend class QThreadData;
385
386private:
387 void doSetObjectName(const QString &name);
388 bool doSetProperty(const char *name, const QVariant *lvalue, QVariant *rvalue);
389
390 Q_DISABLE_COPY(QObject)
391
392private:
393 static QMetaObject::Connection connectImpl(const QObject *sender, void **signal,
394 const QObject *receiver, void **slotPtr,
395 QtPrivate::QSlotObjectBase *slot, Qt::ConnectionType type,
396 const int *types, const QMetaObject *senderMetaObject);
397
398 static bool disconnectImpl(const QObject *sender, void **signal, const QObject *receiver, void **slot,
399 const QMetaObject *senderMetaObject);
400
401};
402
403inline QMetaObject::Connection QObject::connect(const QObject *asender, const char *asignal,
404 const char *amember, Qt::ConnectionType atype) const
405{ return connect(sender: asender, signal: asignal, receiver: this, member: amember, atype); }
406
407#if QT_CORE_INLINE_IMPL_SINCE(6, 6)
408bool QObject::setProperty(const char *name, const QVariant &value)
409{
410 return doSetProperty(name, lvalue: &value, rvalue: nullptr);
411}
412#endif // inline since 6.6
413bool QObject::setProperty(const char *name, QVariant &&value)
414{
415 return doSetProperty(name, lvalue: &value, rvalue: &value);
416}
417
418template <class T>
419inline T qobject_cast(QObject *object)
420{
421 static_assert(std::is_pointer_v<T>,
422 "qobject_cast requires to cast towards a pointer type");
423 typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type ObjType;
424 static_assert(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
425 "qobject_cast requires the type to have a Q_OBJECT macro");
426 return static_cast<T>(ObjType::staticMetaObject.cast(object));
427}
428
429template <class T>
430inline T qobject_cast(const QObject *object)
431{
432 static_assert(std::is_pointer_v<T>,
433 "qobject_cast requires to cast towards a pointer type");
434 static_assert(std::is_const_v<std::remove_pointer_t<T>>,
435 "qobject_cast cannot cast away constness (use const_cast)");
436 typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type ObjType;
437 static_assert(QtPrivate::HasQ_OBJECT_Macro<ObjType>::Value,
438 "qobject_cast requires the type to have a Q_OBJECT macro");
439 return static_cast<T>(ObjType::staticMetaObject.cast(object));
440}
441
442
443template <class T> constexpr const char * qobject_interface_iid() = delete;
444template <class T> inline T *
445qobject_iid_cast(QObject *object, const char *IId = qobject_interface_iid<T *>())
446{
447 return reinterpret_cast<T *>((object ? object->qt_metacast(IId) : nullptr));
448}
449template <class T> inline std::enable_if_t<std::is_const<T>::value, T *>
450qobject_iid_cast(const QObject *object)
451{
452 // NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
453 QObject *o = const_cast<QObject *>(object);
454 return qobject_iid_cast<std::remove_cv_t<T>>(o);
455}
456
457#if defined(Q_QDOC)
458# define Q_DECLARE_INTERFACE(IFace, IId)
459#elif !defined(Q_MOC_RUN)
460# define Q_DECLARE_INTERFACE(IFace, IId) \
461 template <> constexpr const char *qobject_interface_iid<IFace *>() \
462 { return IId; } \
463 template <> inline IFace *qobject_cast<IFace *>(QObject *object) \
464 { return qobject_iid_cast<IFace>(object); } \
465 template <> inline const IFace *qobject_cast<const IFace *>(const QObject *object) \
466 { return qobject_iid_cast<const IFace>(object); }
467#endif // Q_MOC_RUN
468
469inline const QBindingStorage *qGetBindingStorage(const QObject *o)
470{
471 return o->bindingStorage();
472}
473inline QBindingStorage *qGetBindingStorage(QObject *o)
474{
475 return o->bindingStorage();
476}
477
478#ifndef QT_NO_DEBUG_STREAM
479Q_CORE_EXPORT QDebug operator<<(QDebug, const QObject *);
480#endif
481
482class QSignalBlocker
483{
484public:
485 Q_NODISCARD_CTOR
486 inline explicit QSignalBlocker(QObject *o) noexcept;
487 Q_NODISCARD_CTOR
488 inline explicit QSignalBlocker(QObject &o) noexcept;
489 inline ~QSignalBlocker();
490
491 Q_NODISCARD_CTOR
492 inline QSignalBlocker(QSignalBlocker &&other) noexcept;
493 inline QSignalBlocker &operator=(QSignalBlocker &&other) noexcept;
494
495 inline void reblock() noexcept;
496 inline void unblock() noexcept;
497 inline void dismiss() noexcept;
498
499private:
500 Q_DISABLE_COPY(QSignalBlocker)
501 QObject *m_o;
502 bool m_blocked;
503 bool m_inhibited;
504};
505
506QSignalBlocker::QSignalBlocker(QObject *o) noexcept
507 : m_o(o),
508 m_blocked(o && o->blockSignals(b: true)),
509 m_inhibited(false)
510{}
511
512QSignalBlocker::QSignalBlocker(QObject &o) noexcept
513 : m_o(&o),
514 m_blocked(o.blockSignals(b: true)),
515 m_inhibited(false)
516{}
517
518QSignalBlocker::QSignalBlocker(QSignalBlocker &&other) noexcept
519 : m_o(other.m_o),
520 m_blocked(other.m_blocked),
521 m_inhibited(other.m_inhibited)
522{
523 other.m_o = nullptr;
524}
525
526QSignalBlocker &QSignalBlocker::operator=(QSignalBlocker &&other) noexcept
527{
528 if (this != &other) {
529 // if both *this and other block the same object's signals:
530 // unblock *this iff our dtor would unblock, but other's wouldn't
531 if (m_o != other.m_o || (!m_inhibited && other.m_inhibited))
532 unblock();
533 m_o = other.m_o;
534 m_blocked = other.m_blocked;
535 m_inhibited = other.m_inhibited;
536 // disable other:
537 other.m_o = nullptr;
538 }
539 return *this;
540}
541
542QSignalBlocker::~QSignalBlocker()
543{
544 if (m_o && !m_inhibited)
545 m_o->blockSignals(b: m_blocked);
546}
547
548void QSignalBlocker::reblock() noexcept
549{
550 if (m_o)
551 m_o->blockSignals(b: true);
552 m_inhibited = false;
553}
554
555void QSignalBlocker::unblock() noexcept
556{
557 if (m_o)
558 m_o->blockSignals(b: m_blocked);
559 m_inhibited = true;
560}
561
562void QSignalBlocker::dismiss() noexcept
563{
564 m_o = nullptr;
565}
566
567namespace QtPrivate {
568 inline QObject & deref_for_methodcall(QObject &o) { return o; }
569 inline QObject & deref_for_methodcall(QObject *o) { return *o; }
570}
571#define Q_SET_OBJECT_NAME(obj) QT_PREPEND_NAMESPACE(QtPrivate)::deref_for_methodcall(obj).setObjectName(QLatin1StringView(#obj))
572
573QT_END_NAMESPACE
574
575#endif
576
577#endif // QOBJECT_H
578

source code of qtbase/src/corelib/kernel/qobject.h