ExpressionParser: Pass control qualifiers by const reference

These aren't necessarily cheap to copy, since a control qualifier will
have around 3 std::strings inside of it, so passing by value can churn
allocations a little bit.

1 files changed, 3 insertions, 3 deletions

diff --git a/Source/Core/InputCommon/ControlReference/ExpressionParser.h b/Source/Core/InputCommon/ControlReference/ExpressionParser.h
index 405445b8a0..bc39762127 100644
--- a/Source/Core/InputCommon/ControlReference/ExpressionParser.h
+++ b/Source/Core/InputCommon/ControlReference/ExpressionParser.h
@@ -150,9 +150,9 @@ public:
   {
   }
 
-  std::shared_ptr<Core::Device> FindDevice(ControlQualifier qualifier) const;
-  Core::Device::Input* FindInput(ControlQualifier qualifier) const;
-  Core::Device::Output* FindOutput(ControlQualifier qualifier) const;
+  std::shared_ptr<Core::Device> FindDevice(const ControlQualifier& qualifier) const;
+  Core::Device::Input* FindInput(const ControlQualifier& qualifier) const;
+  Core::Device::Output* FindOutput(const ControlQualifier& qualifier) const;
   // Returns an existing variable by the specified name if already existing. Creates it otherwise.
   std::shared_ptr<ControlState> GetVariablePtr(const std::string& name);