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rdstate

#include <iostream>iostate rdstate() const;

The rdstate( ) function is a member of ios.

The rdstate( ) function returns the status of the associated stream. The C++ I/O system maintains status information about the outcome of each I/O operation relative to each active stream. The current state of a stream is held in an object of type iostate, in which the following flags are defined:

Name	Meaning
goodbit	No errors occurred
eofbit	End of file is encountered
failbit	A nonfatal I/O error has occurred
badbit	A fatal I/O error has occurred

These flags are enumerated inside ios (via ios_base).

rdstate( ) returns goodbit when no error has occurred; otherwise, an error bit has been set.

Related functions are eof( ), good( ), bad( ), clear( ), setstate( ), and fail( ).