bit (Array) (ANSI and GNU Common Lisp Document)

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#### 15.2.33 bit, sbit [Accessor]

`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

#### See Also::

aref ,

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.