vector-push new-element vector ⇒ new-index-p
vector-push-extend new-element vector &optional extension ⇒ new-index
| new-element | an object. |
| 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)
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.