vector-pop (Function)

Syntax:

Arguments and Values:

vector—a vector with a fill pointer.

element—an object.

Description:

Decreases the fill pointer of vector by one, and retrieves the element of vector that is designated by the new fill pointer.

Examples:

 (vector-push (setq fable (list 'fable))
              (setq fa (make-array 8
                                   :fill-pointer 2
                                   :initial-element 'sisyphus))) → 2
 (fill-pointer fa) → 3
 (eq (vector-pop fa) fable) → true
 (vector-pop fa) → SISYPHUS
 (fill-pointer fa) → 1

Side Effects:

The fill pointer is decreased by one.

Affected By:

The value of the fill pointer.

Exceptional Situations:

An error of type type-error is signaled if vector does not have a fill pointer.

If the fill pointer is zero, vector-pop signals an error of type error.

See Also:

vector-push, vector-push-extend, fill-pointer