Use a constant reference for a string.

diff --git a/cdr/common/include/deal.II-cdr/parameters.h b/cdr/common/include/deal.II-cdr/parameters.h
index ddf2d15323c9b0d9911087d74eb9c863a818d534..83e21bf00e90380b4c9e81f82cd0cab75720c8a1 100644 (file)
--- a/cdr/common/include/deal.II-cdr/parameters.h
+++ b/cdr/common/include/deal.II-cdr/parameters.h
@@ -36,7 +36,7 @@ namespace CDR
     unsigned int save_interval;
     unsigned int patch_level;
 
-    void read_parameter_file(std::string file_name);
+    void read_parameter_file(const std::string &file_name);
   private:
     void configure_parameter_handler(ParameterHandler &parameter_handler);
   };

diff --git a/cdr/common/source/parameters.cc b/cdr/common/source/parameters.cc
index b5b7fe12a6295390ceb981c35ccfc8c615150e5d..36f606afc0643e90b5e4831fd34d2c203a638d8d 100644 (file)
--- a/cdr/common/source/parameters.cc
+++ b/cdr/common/source/parameters.cc
@@ -62,7 +62,7 @@ namespace CDR
     parameter_handler.leave_subsection();
   }
 
-  void Parameters::read_parameter_file(std::string file_name)
+  void Parameters::read_parameter_file(const std::string &file_name)
   {
     ParameterHandler parameter_handler;
     {