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bug#64960: Documentation for copy-sequence
From: |
uzibalqa |
Subject: |
bug#64960: Documentation for copy-sequence |
Date: |
Mon, 31 Jul 2023 06:19:46 +0000 |
------- Original Message -------
On Monday, July 31st, 2023 at 5:24 PM, Michael Heerdegen
<michael_heerdegen@web.de> wrote:
> uzibalqa via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" bug-gnu-emacs@gnu.org writes:
>
> > > > When I modify the copy, the original remains intact.
> > >
> > > No, if you modify an element of the copy, the corresponding element of
> > > the original is also changed. That's what "shared" means.
> >
> > Except for strings
>
>
> It is irrelevant what happens when you modify elements of a copied
> string because it is impossible. The statement is simply not applicable
> to strings. That's why the docstring only speaks of "list, vector or
> record".
> Note that substituting a character in a string is not the same as
> modifying the character. You are substituting a sequence element with
> another one and not modifying an element in that case.
That I understand. I am substituting, but still one gets a different string
nevertheless.
> The same is true for the list (1 2 3) for example. Exactly the same
> situation as for a string: You can replace the number 2 in a copy with
> another one but you can't modify the number 2 in the list. Numbers and
> characters are not mutable.
This is the difficult part. You have a copy of a list and you can swap
elements but not make new ones. So what you share is the address, where
element 2 say uses the address of element 3.
All this copy-sequence is then quite restrictive in its capabilities.
It does not allow much changes.
> Michael.
>
- bug#64960: Documentation for copy-sequence, (continued)
- bug#64960: Documentation for copy-sequence, uzibalqa, 2023/07/30
- bug#64960: Documentation for copy-sequence, Dmitry Gutov, 2023/07/30
- bug#64960: Documentation for copy-sequence, uzibalqa, 2023/07/30
- bug#64960: Documentation for copy-sequence, Drew Adams, 2023/07/30
- bug#64960: Documentation for copy-sequence, uzibalqa, 2023/07/30
- bug#64960: Documentation for copy-sequence, Drew Adams, 2023/07/30
- bug#64960: Documentation for copy-sequence, uzibalqa, 2023/07/30
- bug#64960: Documentation for copy-sequence, Eli Zaretskii, 2023/07/30
- bug#64960: Documentation for copy-sequence, uzibalqa, 2023/07/30
- bug#64960: Documentation for copy-sequence, Michael Heerdegen, 2023/07/31
- bug#64960: Documentation for copy-sequence,
uzibalqa <=
- bug#64960: Documentation for copy-sequence, Michael Heerdegen, 2023/07/31
- bug#64960: Documentation for copy-sequence, Drew Adams, 2023/07/31