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
|str||-|| C string holding the name of the desired mapping.
The following values of
 Return value
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.
 See also
| performs character mapping according to the specified LC_CTYPE mapping category |
C documentation for wctrans