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Q_DECLARE_INTERFACE: add missing const to const qobject_cast

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[ChangeLog][Potantially Source-Incompatible Changes] The macro
Q_DECLARE_INTERFACE used to cast away the constness of the QObject
parameter. That is now fixed in this release, but may cause failure to
build source code that depended on this incorrect behavior. If fixing
the const correctness in your code is not an option, insert an explicit
const_cast<IFace *> of the object prior to the qobject_cast call.

Change-Id: Ie72b0dd0fbe84d2caae0fffd16a246a36f0c088f
Reviewed-by: Rui Oliveira
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Thiago Macieira 2021-09-06 08:54:42 -07:00
parent 0108275b0c
commit da2fd6a903
1 changed files with 1 additions and 1 deletions
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src/corelib/kernel/qobject.h
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@ -501,7 +501,7 @@ inline QBindingStorage *qGetBindingStorage(QObject *o)
{ return IId; } \
template <> inline IFace *qobject_cast<IFace *>(QObject *object) \
{ return reinterpret_cast<IFace *>((object ? object->qt_metacast(IId) : nullptr)); } \
template <> inline IFace *qobject_cast<IFace *>(const QObject *object) \
template <> inline const IFace *qobject_cast<const IFace *>(const QObject *object) \
{ return reinterpret_cast<IFace *>((object ? const_cast<QObject *>(object)->qt_metacast(IId) : nullptr)); }
#endif // Q_MOC_RUN