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Showing content from https://timsong-cpp.github.io/cppwp/n4140/syserr.errcondition.observers below:

[syserr.errcondition.observers]

19.5.3.4 Class error_condition observers [syserr.errcondition.observers]

int value() const noexcept;

1

Returns: val_.

const error_category& category() const noexcept;

2

Returns: *cat_.

string message() const;

3

Returns: category().message(value()).

explicit operator bool() const noexcept;

4

Returns: value() != 0.

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