[boost] [string_algo] iless?

Hi, It's easy to sort a container of std::strings lexicographically. Just sort it - string's < operator takes care of things. But what if I wanted to do a case-insensitive sort? There's no predicate for case-insensitive comparison in the standard library, so I turned to the next logical place: Boost's string algorithm library. But while there's iequals, I couldn't find iless. It seems to me like this predicate would be quite useful. Yes, I know how complicated full-blown Unicode CI sorting can be. I read Sorting It All Out. But I think most people are looking for something simpler anyway. Sebastian Redl