[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: string is read-only

From: Taylan Kammer
Subject: Re: string is read-only
Date: Wed, 3 Aug 2022 11:42:16 +0200
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0

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:
> <>
> 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"))


reply via email to

[Prev in Thread] Current Thread [Next in Thread]