std::wctrans (3) - Linux Manuals
Defined in header <cwctype>
std::wctrans_t wctrans( const char* str );
Constructs a value of type std::wctrans_t that describes a LC_CTYPE category of wide character mapping. It may be one of the standard mappings, or a locale-specific mapping, such as "tojhira" or "tojkana".
str - Value of str Effect
std::wctrans_t object suitable for use with std::towctrans to map wide characters according to the named mapping of the current C locale or zero if str does not name a mapping supported by the current C locale.