1 files changed, 4 insertions, 3 deletions
diff --git a/sets.h b/sets.h
index 59768f0..930314d 100644
--- a/sets.h
+++ b/sets.h
@@ -25,11 +25,12 @@ struct set_elt {
     int value;
     struct set_elt *next;
 };
-struct set {
+typedef struct {
     struct set_elt *first, *last;
-};
+	int size;	// number of elements
+} t_set_descriptor;
 
-typedef struct set *set;
+typedef t_set_descriptor *set;
 #endif
 
 #ifdef TREAPS