Data update

Task/Queue-Definition/OCaml/queue-definition-2.ml

@@ -0,0 +1,28 @@
+# open FIFO;;
+# let q = empty ;;
+val q : '_a FIFO.fifo = <abstr>
+# is_empty q ;;
+- : bool = true
+# let q = push q 1 ;;
+val q : int FIFO.fifo = <abstr>
+# is_empty q ;;
+- : bool = false
+
+# let q =
+    List.fold_left push q [2;3;4] ;;
+val q : int FIFO.fifo = <abstr>
+
+# let v, q = pop q ;;
+val v : int = 1
+val q : int FIFO.fifo = <abstr>
+# let v, q = pop q ;;
+val v : int = 2
+val q : int FIFO.fifo = <abstr>
+# let v, q = pop q ;;
+val v : int = 3
+val q : int FIFO.fifo = <abstr>
+# let v, q = pop q ;;
+val v : int = 4
+val q : int FIFO.fifo = <abstr>
+# let v, q = pop q ;;
+Exception: Failure "empty fifo".