protected virtual member function
<locale>
std::ctype::do_widen
| single character (1) | 
  char_type do_widen (char c) const;
  | 
|---|
| sequence (2) | 
const char* do_widen (const char* low, const char* high, char_type* to) const;  | 
|---|
Widen character(s) [virtual]
Virtual protected member function called by ctype::widen to transform char values into their equivalents of the character type managed by the facet.
Polymorphic derived classes can overwrite the behavior of this function.
See ctype::widen for its default behavior in ctype.
See also
- ctype::widen
 - Widen character(s) (public member function
)