Defined in header
wint_t ungetwc( wint_t ch, std::FILE* stream );
Puts the wide character
ch back to the given file stream.
Only one wide character pushback is guaranteed.
|ch||-||wide character to be put back|
|stream||-||file stream to put the wide character back to|
 Return value
ch is returned.
On failure WEOF is returned and the given stream remains unchanged.
 See also
| puts a character back into a file stream
| gets a wide character from a file stream
C documentation for ungetwc