std::basic_ios<CharT,Traits>::setstate (3) - Linux Manuals

std::basic_ios<CharT,Traits>::setstate: std::basic_ios<CharT,Traits>::setstate


std::basic_ios<CharT,Traits>::setstate - std::basic_ios<CharT,Traits>::setstate


void setstate( iostate state );

Sets the stream error flags state in addition to currently set flags. Essentially calls clear(rdstate() | state). May throw an exception.


        stream error state flags to set. It can be a combination of the following constants:

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

Return value



// Run this code

  #include <iostream>
  #include <sstream>

  int main()
      std::ostringstream stream;

      if (! {
          std::cout << "stream is not fail\n";


      if ( {
          std::cout << "now stream is fail\n";

      if (!stream.good()) {
          std::cout << "and stream is not good\n";


  stream is not fail
  now stream is fail
  and stream is not good

See also

        returns state flags
rdstate (public member function)
        modifies state flags
clear (public member function)