[boost] [unicode] provide <boost/cuchar.hpp> header?

The C++11 standard library provides a header <cuchar>, with a bit of Unicode support, based on C's <uchar.h>: Macros: __STDC_UTF_16__, __STDC_UTF_32__ Functions: mbrtoc16, c16rtomb, mbrtoc32, c32rtomb The functions provide conversion between char sequences and UTF-16/UTF-32. It would be useful to have a <boost/cuchar.hpp> header so that these functions could be used with existing compilers and standard libraries. Does anyone have an implementation of these functions they would be willing to contribute? --Beman