It came up in the context of that width thing in format and I was asking if I had permission to make wider-than-2 characters format properly, and the forwarded text doesn’t seem to allow that (which is OK, I just wanted to understand at the time); I was thinking of U+FDFD (﷽).




From: Corentin
Sent: Tuesday, November 12, 2019 8:42 AM
To: C++ Library Evolution Working Group
Cc:; Billy O'Neal (VC LIBS); SG16
Subject: Re: [isocpp-lib-ext] The "Let's Stop Ascribing Meaning to Code Points" blog post




On Tue, 12 Nov 2019 at 16:58, Billy O'Neal (VC LIBS) via Lib-Ext <> wrote:

During review of some Unicode stuff in LWG we had a mini discussion for some folks about grapheme clusters and I mentioned everyone who touches this stuff might understand the complexities better if they read this:



FYI SG-16 is aware of that blog post and i think there is a pretty strong agreement with it.

Codepoints have some use (notably the Unicode Character Database is really the Unicode Codepoint Database, and most Unicode algorithms works on codepoints), but any kind of user facing UX should deal with EGCS.

It is not always what applications choose to do for a variety of reasons. Notably Twitter character counts deals in codepoints, web browsers search function use codepoints as to ignore diacritics, and comparisons can be done on (normalized)  codepoint sequences.


There is also not always a 1-1 mapping between what people understand as "character", grapheme clusters and glyphes.




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