19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.5 Class error_condition [syserr.errcondition]

19.5.5.4 Observers [syserr.errcondition.observers]

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int value() const noexcept;
1
#
Returns: val_.
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const error_category& category() const noexcept;
2
#
Returns: *cat_.
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string message() const;
3
#
Returns: category().message(value()).
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explicit operator bool() const noexcept;
4
#
Returns: value() != 0.