QtWidgets: replace 0 with \nullptr in documentation

Replace 0 with \nullptr in the documentation.
As a drive-by also replace some 0 with nullptr in the corresponding
code.

Change-Id: I8d7e9c838da1399988a830669d58fc7f2f010696
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/widgets/widgets/qtabwidget.cpp b/src/widgets/widgets/qtabwidget.cpp
index 8a848554e3..547b8a82f9 100644
--- a/src/widgets/widgets/qtabwidget.cpp
+++ b/src/widgets/widgets/qtabwidget.cpp
@@ -579,7 +579,7 @@ void QTabWidget::setTabEnabled(int index, bool enable)
 
   All widgets set here will be deleted by the tab widget when it is
   destroyed unless you separately reparent the widget after setting
-  some other corner widget (or 0).
+  some other corner widget (or \nullptr).
 
   Note: Corner widgets are designed for \l North and \l South tab positions;
   other orientations are known to not work properly.
@@ -605,7 +605,7 @@ void QTabWidget::setCornerWidget(QWidget * widget, Qt::Corner corner)
 }
 
 /*!
-    Returns the widget shown in the \a corner of the tab widget or 0.
+    Returns the widget shown in the \a corner of the tab widget or \nullptr.
 */
 QWidget * QTabWidget::cornerWidget(Qt::Corner corner) const
 {
@@ -1146,8 +1146,8 @@ void QTabWidget::keyPressEvent(QKeyEvent *e)
 }
 
 /*!
-    Returns the tab page at index position \a index or 0 if the \a
-    index is out of range.
+    Returns the tab page at index position \a index or \nullptr if the
+    \a index is out of range.
 */
 QWidget *QTabWidget::widget(int index) const
 {