Small performance improvements suggested by clang-tidy

mostly add const &, a few std::move and in particular case, remove const
so the std::move being done over the variable actually has effect

Change-Id: Id611cd31bc012f219d7a17d4626b1c2a5fbddd66
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/quick/items/qquickopenglshadereffect.cpp b/src/quick/items/qquickopenglshadereffect.cpp
index 0fd7df8938..e217fdb5d0 100644
--- a/src/quick/items/qquickopenglshadereffect.cpp
+++ b/src/quick/items/qquickopenglshadereffect.cpp
@@ -189,8 +189,8 @@ class MappedSlotObject: public QtPrivate::QSlotObjectBase
 public:
     typedef std::function<void()> PropChangedFunc;
 
-    explicit MappedSlotObject(PropChangedFunc func)
-        : QSlotObjectBase(&impl), _signalIndex(-1), func(func)
+    explicit MappedSlotObject(PropChangedFunc f)
+        : QSlotObjectBase(&impl), _signalIndex(-1), func(std::move(f))
     { ref(); }
 
     void setSignalIndex(int idx) { _signalIndex = idx; }