CoreLib: 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.

Change-Id: Id9ea11b16947220cd27787c0b529de62d10b6c26
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/corelib/io/qresource.cpp b/src/corelib/io/qresource.cpp
index 96957ac11d..7fe3753da4 100644
--- a/src/corelib/io/qresource.cpp
+++ b/src/corelib/io/qresource.cpp
@@ -303,12 +303,12 @@ QResourcePrivate::ensureInitialized() const
     if(!that->absoluteFilePath.startsWith(QLatin1Char(':')))
         that->absoluteFilePath.prepend(QLatin1Char(':'));
 
-    QString path = fileName;
+    QStringRef path(&fileName);
     if(path.startsWith(QLatin1Char(':')))
         path = path.mid(1);
 
     if(path.startsWith(QLatin1Char('/'))) {
-        that->load(path);
+        that->load(path.toString());
     } else {
         QMutexLocker lock(resourceMutex());
         QStringList searchPaths = *resourceSearchPaths();