1 files changed, 4 insertions, 0 deletions
diff --git a/src/list.h b/src/list.h
index d774f96..b710aa2 100644
--- a/src/list.h
+++ b/src/list.h
@@ -28,8 +28,12 @@ typedef void (*printer)(void *);
 typedef printer acter;          /* a type that can act on list
                                    elements */
 
+typedef void (*doer)(void);
+
 void map_list(List *ls, acter f);
 
+void map_list_between(List *ls, acter f, doer d);
+
 void print_list(List *ls, printer prt);
 
 /* COPYER is expected to return NULL when it fails to copy. */