Check if failure has occurred.
  The function returns true if an error other than End-Of-File has occurred in an i/o operation.
  The function checks if either badbit or failbit state flags are set in the stream, if so it returns true, otherwise false.

Parameters.

none

 

Return Value.
  true if badbit and/or failbit are set.
  false if none of badbit nor failbit are set.

Basic template member declaration ( basic_ios<charT,traits> ):

bool fail () const;

See also.
  good, bad, eof, rdstate, clear
  ios class