vector-push new-element vector => new-index-p
vector-push-extend new-element vector &optional extension => new-index
Arguments and Values:
vector---a vector with a fill pointer.
extension---a positive integer. The default is implementation-dependent.
new-index-p---a valid array index for vector, or nil.
new-index---a valid array index for vector.
vector-push and vector-push-extend store new-element in vector. vector-push attempts to store new-element in the element of vector designated by the fill pointer, and to increase the fill pointer by one. If the (>= (fill-pointer vector) (array-dimension vector 0)), neither vector nor its fill pointer are affected. Otherwise, the store and increment take place and vector-push returns the former value of the fill pointer which is one less than the one it leaves in vector.
vector-push-extend is just like vector-push except that if the fill pointer gets too large, vector is extended using adjust-array so that it can contain more elements. Extension is the minimum number of elements to be added to vector if it must be extended.
vector-push and vector-push-extend return the index of new-element in vector. If (>= (fill-pointer vector) (array-dimension vector 0)), vector-push returns nil.
(vector-push (setq fable (list 'fable)) (setq fa (make-array 8 :fill-pointer 2 :initial-element 'first-one))) => 2 (fill-pointer fa) => 3 (eq (aref fa 2) fable) => true (vector-push-extend #\X (setq aa (make-array 5 :element-type 'character :adjustable t :fill-pointer 3))) => 3 (fill-pointer aa) => 4 (vector-push-extend #\Y aa 4) => 4 (array-total-size aa) => at least 5 (vector-push-extend #\Z aa 4) => 5 (array-total-size aa) => 9 ;(or more)
The value of the fill pointer.
How vector was created.
An error of type error is signaled by vector-push-extend if it tries to extend vector and vector is not actually adjustable.
An error of type error is signaled if vector does not have a fill pointer.
adjustable-array-p, fill-pointer, vector-pop