DBus: 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.

Add overloaded functions with QStringRef arg
in QDBusUtil:
- isValidUniqueConnectionName()
- isValidMemberName()
- isValidPartOfObjectPath()

Change-Id: I4a24a298702728ba7d3a65c39e25c3a9c759e07f
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/src/dbus/qdbusutil_p.h b/src/dbus/qdbusutil_p.h
index 27b61ad7f2..e0ba92be2e 100644
--- a/src/dbus/qdbusutil_p.h
+++ b/src/dbus/qdbusutil_p.h
@@ -68,15 +68,18 @@ namespace QDBusUtil
 {
     Q_DBUS_EXPORT bool isValidInterfaceName(const QString &ifaceName);
 
-    Q_DBUS_EXPORT bool isValidUniqueConnectionName(const QString &busName);
+    Q_DBUS_EXPORT bool isValidUniqueConnectionName(const QStringRef &busName);
+    bool inline isValidUniqueConnectionName(const QString &busName) { return isValidUniqueConnectionName(QStringRef(&busName)); }
 
     Q_DBUS_EXPORT bool isValidBusName(const QString &busName);
 
-    Q_DBUS_EXPORT bool isValidMemberName(const QString &memberName);
+    Q_DBUS_EXPORT bool isValidMemberName(const QStringRef &memberName);
+    bool inline isValidMemberName(const QString &memberName) { return isValidMemberName(QStringRef(&memberName)); }
 
     Q_DBUS_EXPORT bool isValidErrorName(const QString &errorName);
 
-    Q_DBUS_EXPORT bool isValidPartOfObjectPath(const QString &path);
+    Q_DBUS_EXPORT bool isValidPartOfObjectPath(const QStringRef &path);
+    bool inline isValidPartOfObjectPath(const QString &path) { return isValidPartOfObjectPath(QStringRef(&path)); }
 
     Q_DBUS_EXPORT bool isValidObjectPath(const QString &path);