Add TODOs.

diff --git a/TODO b/TODO
index 6a1a69f9d29dd3229a5f3531a6a04d929de9213f..d4afd5c0ad8b2782c3403364270b50bdc385c903 100644 (file)
--- a/TODO
+++ b/TODO
@@ -120,3 +120,6 @@
   - Rewrite quick_sort() to use heap sort, for O(1) stack usage.
 
   - Rewrite list_sort() to use merge sort, for O(1) heap usage.
+
+  - Make list_elem and hash_elem a struct, by encapsulating a struct
+    list_elem inside a struct hash_elem as a member.