1 files changed, 29 insertions, 0 deletions
diff --git a/queue.lisp b/queue.lisp
new file mode 100644
index 0000000..cc91eb8
--- /dev/null
+++ b/queue.lisp
@@ -0,0 +1,29 @@
+(in-package #:queue)
+
+(declaim (optimize (speed 3) (safety 0)))
+
+(defun new ()
+  (cons nil nil))
+
+(defun add (q datum)
+  (let ((element (cons datum nil)))
+    (if (car q)
+      (progn
+        (setf (cddr q) element)
+        (setf (cdr q) (cddr q)))
+      (progn
+        (setf (car q) element)
+        (setf (cdr q) element)))
+    q))
+
+(defun sub (q)
+  (pop (car q)))
+
+(defun peek (q)
+  (caar q))
+
+(defun to-list (q)
+  (car q))
+
+(defun from-list (lst)
+  (cons lst (last lst)))