atom

ToC

Allegro CL version 8.0

ANSI Common Lisp

14.2.7 atom

Function

Syntax:

atom object

generalized-boolean

Arguments and Values:

object - an object.

generalized-boolean - a generalized boolean.

Description:

Returns true if object is of type atom; otherwise, returns false.

Examples:

 (atom 'sss)  true
 (atom (cons 1 2))  false
 (atom nil)  true
 (atom '())  true
 (atom 3)  true

Notes:

 (atom object) ==(typep object 'atom) ==(not (consp object))
 ==(not (typep object 'cons)) ==(typep object '(not cons))

Allegro CL Implementation Details:

None.