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: Id8056dc2364a372e40bc04e8cb9fcc443e49fb18
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 5 insertions, 6 deletions

diff --git a/src/widgets/graphicsview/qgraphicsgridlayout.cpp b/src/widgets/graphicsview/qgraphicsgridlayout.cpp
index d9005afbef..6b7052a0ab 100644
--- a/src/widgets/graphicsview/qgraphicsgridlayout.cpp
+++ b/src/widgets/graphicsview/qgraphicsgridlayout.cpp
@@ -552,20 +552,19 @@ int QGraphicsGridLayout::count() const
 }
 
 /*!
-    Returns the layout item at \a index, or 0 if there is no layout item at
-    this index.
+    Returns the layout item at \a index, or \nullptr if there is no
+    layout item at this index.
 */
 QGraphicsLayoutItem *QGraphicsGridLayout::itemAt(int index) const
 {
     Q_D(const QGraphicsGridLayout);
     if (index < 0 || index >= d->engine.itemCount()) {
         qWarning("QGraphicsGridLayout::itemAt: invalid index %d", index);
-        return 0;
+        return nullptr;
     }
-    QGraphicsLayoutItem *item = 0;
     if (QGraphicsGridLayoutEngineItem *engineItem = static_cast<QGraphicsGridLayoutEngineItem*>(d->engine.itemAt(index)))
-        item = engineItem->layoutItem();
-    return item;
+        return engineItem->layoutItem();
+    return nullptr;
 }
 
 /*!