make-sequence result-type size &key initial-element ⇒ sequence
| result-type | a sequence type specifier. |
| size | a non-negative integer. |
| initial-element | an object. The default is implementation-dependent. |
| sequence | a proper sequence. |
Returns a sequence of the type result-type and of length size, each of the elements of which has been initialized to initial-element.
If the result-type is a subtype of list, the result will be a list.
If the result-type is a subtype of vector,
then if the implementation can determine the element type specified
for the result-type, the element type of the resulting array
is the result of upgrading that element type; or, if the
implementation can determine that the element type is unspecified (or *),
the element type of the resulting array is t;
otherwise, an error is signaled.
(make-sequence 'list 0) ⇒ ()
(make-sequence 'string 26 :initial-element #\.)
⇒ ".........................."
(make-sequence '(vector double-float) 2
:initial-element 1d0)
⇒ #(1.0d0 1.0d0)
(make-sequence '(vector * 2) 3) should signal an error
(make-sequence '(vector * 4) 3) should signal an error
The implementation.
The consequences are unspecified if initial-element is not an object which can be stored in the resulting sequence.
An error of type type-error must be signaled if the result-type is neither a recognizable subtype of list, nor a recognizable subtype of vector.
An error of type type-error should be signaled if result-type specifies the number of elements and size is different from that number.
(make-sequence 'string 5) ≡ (make-string 5)