Cleanup EditableItemModel example

Cleanup the EditableItemModel example:
 - include own headers first
 - use nullptr
 - add sanity checks
 - use for loop instead foreach
 - use const where possible

Change-Id: Ib36e5710c07979576b48a905ee50908a64dcb697
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 2 insertions, 3 deletions

diff --git a/examples/widgets/itemviews/editabletreemodel/treeitem.h b/examples/widgets/itemviews/editabletreemodel/treeitem.h
index fd65f12268..867be5f380 100644
--- a/examples/widgets/itemviews/editabletreemodel/treeitem.h
+++ b/examples/widgets/itemviews/editabletreemodel/treeitem.h
@@ -51,7 +51,6 @@
 #ifndef TREEITEM_H
 #define TREEITEM_H
 
-#include <QList>
 #include <QVariant>
 #include <QVector>
 
@@ -59,7 +58,7 @@
 class TreeItem
 {
 public:
-    explicit TreeItem(const QVector<QVariant> &data, TreeItem *parent = 0);
+    explicit TreeItem(const QVector<QVariant> &data, TreeItem *parent = nullptr);
     ~TreeItem();
 
     TreeItem *child(int number);
@@ -75,7 +74,7 @@ public:
     bool setData(int column, const QVariant &value);
 
 private:
-    QList<TreeItem*> childItems;
+    QVector<TreeItem*> childItems;
     QVector<QVariant> itemData;
     TreeItem *parentItem;
 };