From: Taylan Kammer <taylan.kammer@gmail.com>
To: Jean Abou Samra <jean@abou-samra.fr>
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 12:30:50 +0200 [thread overview]
Message-ID: <0474dc97-a009-7d0c-8fc8-fe831f13223a@gmail.com> (raw)
In-Reply-To: <3AEB472A-96A2-4E7D-82BA-4294B8D8099D@abou-samra.fr>
On 03.08.2022 11:50, Jean Abou Samra wrote:
>
>
>> 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/ <https://srfi.schemers.org/srfi-135/>
>
>>
This SRFI defines a new data type, which is not really relevant here.
As far as I know, Guile doesn't support it yet anyway.
--
Taylan
next prev parent reply other threads:[~2022-08-03 10:30 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
2022-08-03 10:30 ` Taylan Kammer [this message]
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
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