GNU bug report logs - #56347
Optimize/simplify STRING_SET_MULTIBYTE

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Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Fri, 1 Jul 2022 23:33:01 UTC

Severity: wishlist

Tags: patch

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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Message #28 received at 56347 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 56347 <at> debbugs.gnu.org
Subject: Re: bug#56347: Optimize/simplify STRING_SET_MULTIBYTE
Date: Sat, 02 Jul 2022 14:00:41 -0400

>> No, I want to reduce the scope of semantics of the macro, e.g. so it can
>> be implemented as a function rather than a macro and so it doesn't
>> magically substitute empty_multibyte_string into a variable that held
>> something else.
> But the effect is that you disallow calling STRING_SET_MULTIBYTE on an
> empty string, isn't it?

Yes.  In my book, STRING_SET_*IBYTE should basically not exist: a string
is created as unibyte or multibyte and never changes after that.

And indeed because we only have a single copy of the two possible empty
strings, they can't be changed between unibyte<->multibyte


        Stefan
This bug report was last modified 3 years and 8 days ago.

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