ToC DocOverview CGDoc RelNotes Index PermutedIndex
Allegro CL
Home Previous Up Next Table of Contents Index
  ANSI Common Lisp   17 Sequences   17.3 Dictionary of Sequences

17.3.3 elt Accessor

Syntax:
elt sequence index    object

(setf (elt sequence index) new-object)

Arguments and Values:
sequence - a proper sequence.

index - a valid sequence index for sequence.

object - an object.

new-object - an object.

Description:
Accesses the element of sequence specified by index.

Examples:
 (setq str (copy-seq "0123456789"))  "0123456789"
 (elt str 6)  #\6
 (setf (elt str 0) #\#)  #\#
 str  "#123456789"

Exceptional Situations:
Should be prepared to signal an error of type type-error if sequence is not a proper sequence. Should signal an error of type type-error if index is not a valid sequence index for sequence.

See Also:
aref, nth, Section 3.2.1 Compiler Terminology

Notes:
aref may be used to access vector elements that are beyond the vector's fill pointer.

Allegro CL Implementation Details:
None.

Home Previous Up Next Table of Contents Index
© Franz Inc. 1998-2009 - File last updated 7-21-2009