From: "Ludovic Courtès" <ludo@gnu.org>
To: Tomas Volf <~@wolfsden.cz>
Cc: 71047-done@debbugs.gnu.org
Subject: bug#71047: [PATCH] doc: Recommend alist-copy instead of list-copy.
Date: Sat, 26 Oct 2024 19:33:42 +0200 [thread overview]
Message-ID: <87r082u5u1.fsf@gnu.org> (raw)
In-Reply-To: <20240518224707.28233-1-~@wolfsden.cz> (Tomas Volf's message of "Sun, 19 May 2024 00:47:07 +0200")
Tomas Volf <~@wolfsden.cz> skribis:
> The current recommendation of `list-copy' is not right and does not lead
> to preserving the original list:
>
> scheme@(guile-user)> (define x (list (cons 'a 1) (cons 'b 2)))
> scheme@(guile-user)> (define y (list-copy x))
> scheme@(guile-user)> (assq-set! y 'b 3)
> $1 = ((a . 1) (b . 3))
> scheme@(guile-user)> x
> $2 = ((a . 1) (b . 3))
>
> Correct approach seems to be use `alist-copy' from SRFI-1 leading to the
> expected behavior of:
>
> scheme@(guile-user)> ,use (srfi srfi-1)
> scheme@(guile-user)> (define x (list (cons 'a 1) (cons 'b 2)))
> scheme@(guile-user)> (define y (alist-copy x))
> scheme@(guile-user)> (assq-set! y 'b 3)
> $1 = ((a . 1) (b . 3))
> scheme@(guile-user)> x
> $2 = ((a . 1) (b . 2))
>
> * doc/ref/api-data.texi (Adding or Setting Alist Entries): Recommend
> `alist-copy'.
Applied, thanks!
prev parent reply other threads:[~2024-10-26 17:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-18 22:47 bug#71047: [PATCH] doc: Recommend alist-copy instead of list-copy Tomas Volf
2024-10-26 17:33 ` Ludovic Courtès [this message]
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