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    Template:cpp/locale/unicode string conversions

    From cppreference.com
    Character
    conversions     		locale-defined multibyte
    (UTF-8, GB18030)     		UTF-8
    		 UTF-16
    UTF-16 mbrtoc16 / c16rtomb (with C11's DR488)

    codecvt<char16_t,char,mbstate_t>
    codecvt_utf8_utf16<char16_t>
    codecvt_utf8_utf16<char32_t>
    codecvt_utf8_utf16<wchar_t>

    		N/A
    UCS-2 c16rtomb (without C11's DR488) codecvt_utf8<char16_t> codecvt_utf16<char16_t>
    UTF-32

    mbrtoc32 / c32rtomb

    codecvt<char32_t,char,mbstate_t>
    codecvt_utf8<char32_t>

    codecvt_utf16<char32_t>

    system wchar_t:

    UTF-32 (non-Windows)
    UCS-2 (Windows)

    mbsrtowcs / wcsrtombs
    use_facet<codecvt
    <wchar_t,char,mbstate_t>>(locale)

    		codecvt_utf8<wchar_t> codecvt_utf16<wchar_t>