unofficial mirror of guile-devel@gnu.org 
 help / color / mirror / Atom feed
From: Jean Abou Samra <jean@abou-samra.fr>
To: Taylan Kammer <taylan.kammer@gmail.com>
Cc: Damien Mattei <damien.mattei@gmail.com>,
	guile-user <guile-user@gnu.org>,
	guile-devel <guile-devel@gnu.org>
Subject: Re: string is read-only
Date: Wed, 3 Aug 2022 11:50:37 +0200	[thread overview]
Message-ID: <3AEB472A-96A2-4E7D-82BA-4294B8D8099D@abou-samra.fr> (raw)
In-Reply-To: <413a34c2-1776-f20f-811a-a9403965484b@gmail.com>



> Le 3 août 2022 à 11:49, Taylan Kammer <taylan.kammer@gmail.com> a écrit :
> 
> On 03.08.2022 11:12, Damien Mattei wrote:
>> GNU Guile 3.0.1
>> Copyright (C) 1995-2020 Free Software Foundation, Inc.
>> 
>> Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
>> This program is free software, and you are welcome to redistribute it
>> under certain conditions; type `,show c' for details.
>> 
>> Enter `,help' for help.
>> scheme@(guile-user)> (define str2 "hello")
>> scheme@(guile-user)> (string-set! str2 4 #\a)
>> ice-9/boot-9.scm:1669:16: In procedure raise-exception:
>> string is read-only: "hello"
>> 
>> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
>> scheme@(guile-user) [1]> ,q
>> scheme@(guile-user)> (string? str2)
>> #t
>> 
>> is it a bug in Guile ? :-O
>> 
>> i can only find reference to deprecated read-only string in old doc:
>> https://www.gnu.org/software/guile/docs/docs-1.6/guile-ref/Read-Only-Strings.html#Read%20Only%20Strings <https://www.gnu.org/software/guile/docs/docs-1.6/guile-ref/Read-Only-Strings.html#Read%20Only%20Strings>
>> 
>> Regards,
>> 
>> Damien
> 
> String literals are constants, and it's intentional.
> 
> I'm not sure if it's mentioned anywhere in the manual.
> 
> If you want to get a mutable string from a literal, you can use:
> 
>  (define str (string-copy "foobar"))
> 
> -- 
> Taylan

This is standard. See the intro of

https://srfi.schemers.org/srfi-135/

> 


  reply	other threads:[~2022-08-03  9:50 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-03  9:12 string is read-only Damien Mattei
2022-08-03  9:32 ` Thomas Morley
     [not found]   ` <CADEOadctjXAyZfwYG3Qbky129i0NBbM+HK6g1iUwvA_HrT4UxA@mail.gmail.com>
2022-08-03  9:51     ` Fwd: " Damien Mattei
2022-08-03  9:59       ` Maxime Devos
2022-08-03  9:41 ` Maxime Devos
2022-08-03  9:57   ` Ricardo G. Herdt
2022-08-03 10:55   ` Damien Mattei
2022-08-03 10:59     ` Maxime Devos
2022-08-03 11:34       ` Damien Mattei
2022-08-03  9:42 ` Taylan Kammer
2022-08-03  9:50   ` Jean Abou Samra [this message]
2022-08-03 10:30     ` Taylan Kammer
2022-08-03 10:33       ` Jean Abou Samra
  -- strict thread matches above, loose matches on Subject: below --
2022-08-03 11:55 Pierpaolo Bernardi
2022-08-03 12:48 ` Damien Mattei

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/guile/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=3AEB472A-96A2-4E7D-82BA-4294B8D8099D@abou-samra.fr \
    --to=jean@abou-samra.fr \
    --cc=damien.mattei@gmail.com \
    --cc=guile-devel@gnu.org \
    --cc=guile-user@gnu.org \
    --cc=taylan.kammer@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).