Preserve const-ness in string comparer.

diff --git a/retrace.hpp b/retrace.hpp
index 806d6ed9c944b328f451d3d4779810824b8da47b..b697adb6b2c7fa7495be034f831c1f47d23b025f 100644 (file)
--- a/retrace.hpp
+++ b/retrace.hpp
@@ -97,7 +97,7 @@ struct Entry {
 
 
 struct stringComparer {
 
 
 struct stringComparer {

-  bool operator() (const char *a, const  char *b) {
+  bool operator() (const char *a, const  char *b) const {

     return strcmp(a, b) < 0;
   }
 };
     return strcmp(a, b) < 0;
   }
 };