Use QStringRef to optimize memory allocation

Replace substring functions that return QString with
corresponding functions that return QStringRef where
it's possible.

Create QString from QStringRef only where necessary.

While touching the code, also port loops to C++11 style.

Change-Id: I04c99b24ea6afd3715e3edf9ea00bfab838fd53c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Frank Meerkoetter <frank.meerkoetter@basyskom.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/qml/qml/qqmlfile.cpp b/src/qml/qml/qqmlfile.cpp
index ea4e9a1013..5fe3cba5c3 100644
--- a/src/qml/qml/qqmlfile.cpp
+++ b/src/qml/qml/qqmlfile.cpp
@@ -583,7 +583,7 @@ QString QQmlFile::urlToLocalFileOrQrc(const QString& url)
 {
     if (url.startsWith(QLatin1String("qrc:"), Qt::CaseInsensitive)) {
         if (url.length() > 4)
-            return QLatin1Char(':') + url.mid(4);
+            return QLatin1Char(':') + url.midRef(4);
         return QString();
     }