Query on UTF-32 encodings for letters

[Geoffrey Keating]

Robert Dewar <dewar@adacore.com> writes:

> Ada 2005 requires full support for all planes of UTF-32
> encoding, including the use of letters in identifiers,
> including also proper upper lower case equivalence.
> 
> All this information is obtainable from the 10646 standard,
> but it is non-trivial to generate the predicates Is_Letter,
> and the function To_Lower.

You might consider glibc, or possibly simply use iswalpha() and towlower().