make string type argument const string& where possible

1 files changed, 2 insertions, 2 deletions

diff --git a/src/DiskWriter.h b/src/DiskWriter.h
index 9e910932..47a2c2a2 100644
--- a/src/DiskWriter.h
+++ b/src/DiskWriter.h
@@ -39,7 +39,7 @@ public:
    * If the file exists, then it is truncated to 0 length.
    * @param filename the file name to be opened.
    */
-  virtual void initAndOpenFile(string filename) = 0;
+  virtual void initAndOpenFile(const string& filename) = 0;
 
   virtual void openFile(const string& filename) = 0;
 
@@ -54,7 +54,7 @@ public:
    *
    * @param filename the file name to be opened.
    */
-  virtual void openExistingFile(string filename) = 0;
+  virtual void openExistingFile(const string& filename) = 0;
 
   /*
    * Writes len bytes from data to this binary stream at offset position.