dbus: Use QList::reserve(), reduces reallocations.

Change-Id: I5d60220c4d3014067a45a3d3553f0523c9fc7c74
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/dbus/qdbusintegrator.cpp b/src/dbus/qdbusintegrator.cpp
index 5135a9a184..22c1a3e363 100644
--- a/src/dbus/qdbusintegrator.cpp
+++ b/src/dbus/qdbusintegrator.cpp
@@ -952,14 +952,19 @@ void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const Q
     }
 
     // output arguments
+    const int numMetaTypes = metaTypes.count();
     QVariantList outputArgs;
     void *null = 0;
     if (metaTypes[0] != QMetaType::Void && metaTypes[0] != QMetaType::UnknownType) {
+        outputArgs.reserve(numMetaTypes - i + 1);
         QVariant arg(metaTypes[0], null);
         outputArgs.append( arg );
         params[0] = const_cast<void*>(outputArgs.at( outputArgs.count() - 1 ).constData());
+    } else {
+        outputArgs.reserve(numMetaTypes - i);
     }
-    for ( ; i < metaTypes.count(); ++i) {
+
+    for ( ; i < numMetaTypes; ++i) {
         QVariant arg(metaTypes[i], null);
         outputArgs.append( arg );
         params.append(const_cast<void*>(outputArgs.at( outputArgs.count() - 1 ).constData()));