bit, sbit (Accessor)

Syntax:

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.

Description:

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

These functions ignore the fill pointer when accessing elements.

Examples:

 (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)

Notes:

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.