copy-list

copy-list Function

Syntax:

copy-list list → copy

Arguments and Values:

list—a proper list or a dotted list.

copy—a list.

Description:

Returns a copy of list. If list is a dotted list, the resulting list will also be a dotted list.

Only the list structure of list is copied; the elements of the resulting list are the same as the corresponding elements of the given list.

Examples:

(setq lst (list 1 (list 2 3))) → (1 (2 3)) 
(setq slst lst) → (1 (2 3)) 
(setq clst (copy-list lst)) → (1 (2 3)) 
(eq slst lst) → true 
(eq clst lst) → false 
(equal clst lst) → true 
(rplaca lst "one") → ("one" (2 3)) 
slst → ("one" (2 3)) 
clst → (1 (2 3)) 
(setf (caadr lst) "two") → "two" 
lst → ("one" ("two" 3)) 
slst → ("one" ("two" 3)) 
clst → (1 ("two" 3)) 

Exceptional Situations:

The consequences are undefined if list is a circular list.

See Also:

copy-alist, copy-seq, copy-tree

Notes:

The copy created is equal to list, but not eq.

list, list∗

Expanded Reference: copy-list

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(copy-list )