Don't use operator (), it's so hard to grep for.

src/gen-perf.cc

@@ -272,7 +272,7 @@ Gen_Perf::change (List_Node *prior, List_Node *curr)
    exponential in the number of keys. */
 
 int
-Gen_Perf::operator() (void)
+Gen_Perf::doit_all (void)
 {
 #if LARGE_STACK_ARRAYS
   unsigned int buffer[max_hash_value + 1];

src/gen-perf.h

@@ -44,7 +44,7 @@ private:
 public:
               Gen_Perf (void);
              ~Gen_Perf (void);
-  int         operator () (void);
+  int         doit_all (void);
 };
 
 #endif

src/main.cc

@@ -62,7 +62,7 @@ main (int argc, char *argv[])
   Gen_Perf generate_table;
 
   /* Generates and prints the Gen_Perf hash table. */
-  int status = generate_table ();
+  int status = generate_table.doit_all ();
 
   /* Check for write error on stdout. */
   if (fflush (stdout) || ferror (stdout))