#commonlisp on 2025-05-22 — irc logs at libera.catirclogs.org

2022-07-28 16:55 jackdaniel changed the topic of #commonlisp to: Common Lisp, the #1=(programmable . #1#) programming language | Wiki: <https://www.cliki.net> | IRC Logs: <https://irclog.tymoon.eu/libera/%23commonlisp> | Cookbook: <https://lispcookbook.github.io/cl-cookbook> | Pastebin: <https://plaster.tymoon.eu/>

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14:00 <jackdaniel> d/win 3

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21:09 <latchflip> Hi everyone - in ANSI Common Lisp (the book), it says "copy-tree copies both the car and the cdr of each cons, while copy-list copies only the cdr." Can someone help me grok that?

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21:25 <mgl> COPY-TREE recurses into both the CAR and CDR, while COPY-LIST just into the CDR.

21:25 <veqq> latchflip:copy-list copies the top like ... imagine the tree, and just copy everything on the top areas, but not the leafs in the middle

21:26 <veqq> it shares the deeper children with the original, instead of copying them too

21:33 <latchflip> Okay so it's like COPY-LIST is a shallow copy that points to the same objects, COPY-TREE is more like a deep copy of both structure and cells? I guess I just don't understand "COPY-LIST copies only the CDR" - almost like that implies the CDR is the source of structure?

21:33 <latchflip> Sorry i'm just wrestling with it

21:34 <latchflip> mgl: veqq: thank you both

21:36 <veqq> latchflip: it's hard to explain with words. I suggest you make a tree and apply both to it. If I could draw a tree with paint and show you, i'd just circle the... "outside" but that's so vague in words, im not articulate

21:37 <Alfr> latchflip, well both only make copies of the cons structure, and in copy-list's case it simply takes whatever the car might be and recurses only on the cdr part.

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21:39 <random-nick> both are shallow copies

21:40 <random-nick> they only copy the cons structure

21:42 <aeth> afaik, you can't have a deep copy because there's no generic COPY, but structs do have a non-generic (shallow?) COPY-FOO function automatically generated

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21:47 <Alfr> They're also remarkably similar ... (defun my-copy-list (list) (if (consp list) (cons (car list) (my-copy-list (cdr list))) list)) and (defun my-copy-tree (list) (if (consp list) (cons (my-copy-tree (car list)) (my-copy-tree (cdr list))) list)).

21:47 <Alfr> latchflip, ^

21:49 <random-nick> Alfr: I wrote out implementations like that to show the difference but I didn't send them, and it's funny that they are character-by-character identical to what you sent

21:50 <Alfr> random-nick, more interestingly: You even checked for that.

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22:16 <latchflip> aeth: I think COPY-TREE actually returns new cons structures for internal elements; COPY-LIST doesn't

22:22 <latchflip> so (setf lst '((a b) (c d)),

22:23 <latchflip> @bar(input):button1

22:23 <latchflip> I don't know why it did that

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22:31 <latchflip> ALFR: aeth: mgl: veqq: thank you all.

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