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  ANSI Common Lisp   15 Arrays   15.2 Dictionary of Arrays

15.2.21 fill-pointer Accessor

Syntax:
fill-pointer vector    fill-pointer

(setf (fill-pointer vector) new-fill-pointer)

Arguments and Values:
vector - a vector with a fill pointer.

fill-pointer, new-fill-pointer - a valid fill pointer for the vector.

Description:
Accesses the fill pointer of vector.

Examples:
 (setq a (make-array 8 :fill-pointer 4))  #(NIL NIL NIL NIL)
 (fill-pointer a)  4
 (dotimes (i (length a)) (setf (aref a i) (* i i)))   NIL
 a  #(0 1 4 9)
 (setf (fill-pointer a) 3)  3
 (fill-pointer a)  3
 a  #(0 1 4)
 (setf (fill-pointer a) 8)  8
 a  #(0 1 4 9 NIL NIL NIL NIL)

Exceptional Situations:
Should signal an error of type type-error if vector is not a vector with a fill pointer.

See Also:
make-array, length

Notes:
There is no operator that will remove a vector's fill pointer.

Allegro CL Implementation Details:
None.

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