cppdraft_translate/cppdraft/syserr/errcat/virtuals.md

[syserr.errcat.virtuals]

19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.3 Class error_category [syserr.errcat]

19.5.3.2 Virtual members [syserr.errcat.virtuals]

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virtual const char* name() const noexcept = 0;

1

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Returns: A string naming the error category.

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virtual error_condition default_error_condition(int ev) const noexcept;

2

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Returns: error_condition(ev, *this).

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virtual bool equivalent(int code, const error_condition& condition) const noexcept;

3

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Returns: default_error_condition(code) == condition.

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virtual bool equivalent(const error_code& code, int condition) const noexcept;

4

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Returns: *this == code.category() && code.value() == condition.

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virtual string message(int ev) const = 0;

5

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Returns: A string that describes the error condition denoted by ev.