19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.4 Class error_code [syserr.errcode]

19.5.4.4 Observers [syserr.errcode.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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error_condition default_error_condition() const noexcept;
3
#
Returns: category().default_error_condition(value()).
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string message() const;
4
#
Returns: category().message(value()).
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explicit operator bool() const noexcept;
5
#
Returns: value() != 0.