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Showing content from https://timsong-cpp.github.io/cppwp/n4140/iostate.flags below:

[iostate.flags]

explicit operator bool() const;

bool operator!() const;

iostate rdstate() const;

Returns: The error state of the stream buffer.

void clear(iostate state = goodbit);

Postcondition: If rdbuf()!=0 then state == rdstate(); otherwise rdstate()==(state | ios_base::badbit).

Effects: If ((state | (rdbuf() ? goodbit : badbit)) & exceptions()) == 0, returns. Otherwise, the function throws an object fail of class basic_ios::failure ([ios::failure]), constructed with implementation-defined argument values.

void setstate(iostate state);

Effects: Calls clear(rdstate() | state) (which may throw basic_ios::failure ([ios::failure])).

bool good() const;

bool eof() const;

Returns: true if eofbit is set in rdstate().

bool fail() const;

Returns: true if failbit or badbit is set in rdstate().304

bool bad() const;

Returns: true if badbit is set in rdstate().

iostate exceptions() const;

Returns: A mask that determines what elements set in rdstate() cause exceptions to be thrown.

void exceptions(iostate except);

Postcondition: except == exceptions().

Effects: Calls clear(rdstate()).

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