Re: The letter Sharp S and the English language

["Randy Brukardt" <randy@rrsoftware.com>]

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"Georg Bauhaus" <rm.dash-bauhaus@futureapps.de> wrote in message 
news:5150a9f2$0$6567$9b4e6d93@newsspool4.arcor-online.net...
...
> Unicode's CaseFolding.txt, if applicable, has two lines pertaining
> to the matter,
>
> 1E9E; F; 0073 0073; # LATIN CAPITAL LETTER SHARP S
> 1E9E; S; 00DF; # LATIN CAPITAL LETTER SHARP S
>
> So I'm wondering if Simple Case Mapping might mean that
>
>  To_Upper (Wide_Character'('ß'))
>
> should return Wide_Character'Val (16#1E9E#) in Ada 2012.

No. You are looking at the wrong Unicode table (case folding is used for 
case-insensitive comparisons, you want case mapping -- these get different 
results. Besides, case folding is a mapping to *lower* case.) If you were 
looking at the right table, the 'S' line would be the important one, and in 
this case, the mapping is to "00DF", which definitely is not "1E9E". ;-)

It's possible that the upper case mapping does use that character, but case 
mapping is implementation-defined in the respect that we don't require the 
use of any particular character set standard so long as it is at least as 
new as 10646:2003. So if a compiler used the 2003 definition, then it would 
be impossible to have the result you want.

Moral: if you care about anything that's changed in character set mappings 
since 10646:2003, then you have to write your own conversions in order to be 
sure that they happen.

                                   Randy.