FunctionPackage: exclToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version

featurep

Arguments: feature-or-list-of-features

This function returns true if the argument correctly describes the state of the *features* list and nil if it does not. feature-or-list-of-features can be any atom or list acceptable to the reader macros #+ and #- (and so can include not, and and or and can contain sublists). Note that the :version>= extension used by Allegro CL is often useful (see Reader macros and cl:*features* in implementation.htm). The Allegro CL style is for features to be keywords. If the argument is an atom, the subsequence of *features* starting at that feature is returned if it is present and nil if it is not.

Examples:

(excl:featurep :gsgc) -> (:gsgc :clos ...)
(excl:featurep :foo) -> nil
(excl:featurep '(and (or :unix :foo))) -> t

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.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version