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std::basic_ios<CharT,Traits>::rdstate - cppreference.com

From cppreference.com

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

#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