ToC DocOverview CGDoc RelNotes Index PermutedIndex
Allegro CL
Home Previous Up Next Table of Contents Index
  ANSI Common Lisp   15 Arrays   15.2 Dictionary of Arrays

15.2.33 bit, sbit Accessor

bit bit-array &rest subscripts bit
sbit bit-array &rest subscripts new-bit

(setf(bit bit-array &rest subscrips) new-bit)
(setf(sbit bit-array &rest subscrips) new-bit)

Arguments and Values:
bit-array - for bit, a bit array; for sbit, a simple bit array.

subscripts - a list of valid array indices for the bit-array.

bit - a bit.

bit and sbit access the bit-array element specified by subscripts.

These functions ignore the fill pointer when accessing elements.

 (bit (setq ba (make-array 8 
                            :element-type 'bit 
                            :initial-element 1))
       3)  1
 (setf (bit ba 3) 0)  0
 (bit ba 3)  0
 (sbit ba 5)  1
 (setf (sbit ba 5) 1)  1
 (sbit ba 5)  1

See Also:
aref, Section 3.2.1 Compiler Terminology

bit and sbit are like aref except that they require arrays to be a bit array and a simple bit array, respectively.

bit and sbit, unlike char and schar, allow the first argument to be an array of any rank.

Allegro CL Implementation Details:

Home Previous Up Next Table of Contents Index
© Franz Inc. 1998-2015 - File last updated 03-23-2015