virtual int_type overflow ( int_type c = Traits::eof() );
Behaves like the base class std::basic_streambuf::overflow, except that to write the data from the put area to the associated character sequence (to the file), first uses codecvt::out() of the imbued locale to convert the characters into external (possibly multibyte) representation, stored in a temporary buffer (allocated as large as necessary), then uses file I/O to copy all fully-converted bytes into the file.
If the conversion fails with std::codecvt_base::error, returns Traits::eof() without attempting any output.
If the associated file is not open (is_open()==false), returns Traits::eof() before doing anything.
Traits::not_eof(c) to indicate success or Traits::eof() to indicate failure.
|This section is incomplete|
Reason: no example