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  ANSI Common Lisp   14 Conses   14.2 Dictionary of Conses

14.2.6 consp Function

Syntax:
consp object    generalized-boolean

Arguments and Values:
object - an object.

generalized-boolean - a generalized boolean.

Description:
Returns true if object is of type cons; otherwise, returns false.

Examples:
 (consp nil)  false
 (consp (cons 1 2))  true

The empty list is not a cons, so

 (consp '()) ==(consp 'nil)  false

See Also:
listp

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

Allegro CL Implementation Details:
None.

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