protected virtual member function
<locale>
std::codecvt::do_encoding
int do_encoding() const throw();
int do_encoding() const noexcept;
Return encoding width [virtual]
Virtual protected member function called by codecvt::encoding to get the encoding width used by the object.
Polymorphic derived classes can overwrite the behavior of this function.
See codecvt::encoding for its default behavior in codecvt.