while

Arguments: condition &rest forms

Evaluates forms repeatedly until condition (which should be a Lisp form) evaluates to nil.

The definition of while is

(defmacro while (condition &rest forms)
  `(loop (unless ,condition (return)) ,@forms))

Note that loop surrounds its body with a block named nil (as used by the return form which is the consequent of the unless form). This macro returns nil.

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.
Created 2012.5.30.