< cpp‎ | io‎ | basic ios
iostate rdstate() const;

Returns the current stream error state.


[edit] Parameters


[edit] Return value

current stream error state. It is a bitmask type and can be a combination of the following constants:

Constant Explanation
goodbit no error
badbit irrecoverable stream error
failbit input/output operation failed (formatting or extraction error)
eofbit associated input sequence has reached end-of-file

[edit] Example

#include <iostream>
#include <sstream>
int main()
  std::ostringstream stream;
  if (stream.rdstate() == std::ios_base::goodbit) {
    std::cout << "stream state is goodbit\n";
  // check state is exactly eofbit (no failbit and no badbit)
  if (stream.rdstate() == std::ios_base::eofbit) {
    std::cout << "stream state is eofbit\n";


stream state is goodbit
stream state is eofbit

[edit] See also

sets state flags
(public member function)
clears error and eof flags
(public member function)