tidy: pass by reference

alib2abstraction/src/core/type_util.cpp

@@ -119,7 +119,7 @@ std::string type_util < std::string >::normalize ( std::string arg ) {
 	return arg;
 }
-std::unique_ptr < type_details_base > type_util < std::string >::type ( std::string ) {
+std::unique_ptr < type_details_base > type_util < std::string >::type ( const std::string & ) {
 	return std::make_unique < type_details_type > ( "std::string" );
 }

alib2abstraction/src/core/type_util.hpp

@@ -80,7 +80,7 @@ struct type_util < std::string > {
 	static std::string normalize ( std::string arg );
-	static std::unique_ptr < type_details_base > type ( std::string arg );
+	static std::unique_ptr < type_details_base > type ( const std::string & arg );
 };
 template < >