Reduce KFileItemModel memory usage by making use of implicit sharing

The idea is based on
http://milianw.de/blog/katekdevelop-sprint-vienna-2012-take-1

REVIEW: 110686

1 files changed, 6 insertions, 0 deletions

diff --git a/src/kitemviews/kfileitemmodel.h b/src/kitemviews/kfileitemmodel.h
index 1d837cb2a..1d2d8c172 100644
--- a/src/kitemviews/kfileitemmodel.h
+++ b/src/kitemviews/kfileitemmodel.h
@@ -430,6 +430,12 @@ private:
     static void determineMimeTypes(const KFileItemList& items, int timeout);
 
     /**
+     * @return Returns a copy of \a value that is implicitly shared
+     * with other users to save memory.
+     */
+    static QByteArray sharedValue(const QByteArray& value);
+
+    /**
      * Checks if the model's internal data structures are consistent.
      */
     bool isConsistent() const;