Is there an alphabetic wchar_t such that its capital and lower versions are the same?

Question

I've been wondering whether there is a char c such that iwalpha(c) == 1 and towlower(c) == towupper(c). I'm trying to implement a dictionary in a trie. Each node has a wchar_t label and a boolean a_word which provides us with the information whether the node represents a word.

I'd like to save such a trie into a file without wasting memory, so I thought I won't save that boolean, but I will write the labels that represent a word with capital case. So my question is whether I'll lose any information that way.

Thanks in advance

Answer 1

Note that iswalpha is locale-specific. Anyway, if your locale supports Arabic letters, they should met your conditions.

EDIT: to make an example with extended Latin characters, towupper('ß') == towlower('ß') == 'ß', as long as the locale supprts the Eszett