array-has-fill-pointer-p array → generalized-boolean

array — an array.

generalized-boolean — a generalized boolean.

Returns true if array has a fill pointer; otherwise returns false.

(array-has-fill-pointer-p (make-array 4)) → implementation-dependent 
(array-has-fill-pointer-p (make-array '(2 3))) → false 
(array-has-fill-pointer-p 
  (make-array 8 
              :fill-pointer 2 
              :initial-element 'filler)) → true

Should signal an error of type type-error if its argument is not an array.

make-array, fill-pointer

Since arrays of rank other than one cannot have a fill pointer, array-has-fill-pointer-p always returns nil when its argument is such an array.