diff options
Diffstat (limited to 'src/corelib/kernel/qpointer.cpp')
| -rw-r--r-- | src/corelib/kernel/qpointer.cpp | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/src/corelib/kernel/qpointer.cpp b/src/corelib/kernel/qpointer.cpp index c7fcf4f1e8..575dad9ed8 100644 --- a/src/corelib/kernel/qpointer.cpp +++ b/src/corelib/kernel/qpointer.cpp @@ -1,6 +1,6 @@ /**************************************************************************** ** -** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** @@ -44,7 +44,7 @@ \brief The QPointer class is a template class that provides guarded pointers to QObject. \ingroup objectmodel - + \obsolete Use QWeakPointer instead. A guarded pointer, QPointer<T>, behaves like a normal C++ pointer \c{T *}, except that it is automatically set to 0 when the @@ -57,6 +57,24 @@ destroyed while you still hold a reference to it. You can safely test the pointer for validity. + Note that Qt 5 introduces two slight changes in behavior when using QPointer. + + \list + + \i When using QPointer on a QWidget (or a subclass of QWidget), previously + the QPointer would be cleared by the QWidget destructor. Now, the QPointer + is cleared by the QObject destructor (since this is when QWeakPointers are + cleared). Any QPointers tracking a widget will \b NOT be cleared before the + QWidget destructor destroys the children for the widget being tracked. + + \i When constructing a QSharedPointer to take ownership of an object after a + QPointer is already tracking the object. Previously, the shared pointer + construction would not be affected by the QPointer, but now that QPointer + is implemented using QWeakPoiner, constructing the QSharedPointer will + cause an \c abort(). + + \endlist + Qt also provides QSharedPointer, an implementation of a reference-counted shared pointer object, which can be used to maintain a collection of references to an individual pointer. |