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CLHS: Accessor BIT, SBIT

Syntax:

bit bit-array &rest subscripts => bit

sbit bit-array &rest subscripts => bit

(setf (bit bit-array &rest subscripts) new-bit)

(setf (sbit bit-array &rest subscripts) 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.

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

Affected By: None.

Exceptional Situations: None.

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.

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