sbit
(sbit bit-array index)
Reads the bit at index of a bit vector (a #* literal or a make-array result with :element-type 'bit, represented as the general vector holding 0/1). (setf (sbit bit-array index) bit) writes it.
(sbit bit-array index)
Reads the bit at index of a bit vector (a #* literal or a make-array result with :element-type 'bit, represented as the general vector holding 0/1). (setf (sbit bit-array index) bit) writes it.