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copy-tree tree ⇒ new-tree
tree—a tree.
new-tree—a tree.
Creates a copy of a tree of conses.
If tree is not a cons, it is returned; otherwise, the result is a new cons of the results of calling copy-tree on the car and cdr of tree. In other words, all conses in the tree represented by tree are copied recursively, stopping only when non-conses are encountered.
copy-tree does not preserve circularities and the sharing of substructure.
(setq object (list (cons 1 "one")
(cons 2 (list 'a 'b 'c))))
⇒ ((1 . "one") (2 A B C))
(setq object-too object) ⇒ ((1 . "one") (2 A B C))
(setq copy-as-list (copy-list object))
(setq copy-as-alist (copy-alist object))
(setq copy-as-tree (copy-tree object))
(eq object object-too) ⇒ true
(eq copy-as-tree object) ⇒ false
(eql copy-as-tree object) ⇒ false
(equal copy-as-tree object) ⇒ true
(setf (first (cdr (second object))) "a"
(car (second object)) "two"
(car object) '(one . 1)) ⇒ (ONE . 1)
object ⇒ ((ONE . 1) ("two" "a" B C))
object-too ⇒ ((ONE . 1) ("two" "a" B C))
copy-as-list ⇒ ((1 . "one") ("two" "a" B C))
copy-as-alist ⇒ ((1 . "one") (2 "a" B C))
copy-as-tree ⇒ ((1 . "one") (2 A B C))