std::basic_ios::rdstate(3)

NAME
std::basic_ios::rdstate - std::basic_ios::rdstate

Synopsis
   iostate rdstate() const;
   Returns the current stream error state.

Parameters
   (none)

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

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

Output:
 stream state is goodbit
 stream state is eofbit

See also
   setstate sets state flags
            (public member function)
   clear modifies state flags
            (public member function)