utf_u8_codecvt
// In header: <boost/unicode/codecvt.hpp> typedef converter_codecvt< wchar_t, utf_boundary, utf_transcoder< char >, utf_boundary, utf_transcoder< wchar_t >> utf_u8_codecvt;
Codecvt facet that converts between UTF-X in-memory and UTF-8 in file, 'X' depending on the size of wchar_t.
wchar_t
