19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.3 Class error_category [syserr.errcat]

19.5.3.4 Program-defined classes derived from error_category [syserr.errcat.derived]

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virtual const char* name() const noexcept = 0;
1
#
Returns: A string naming the error category.
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virtual error_condition default_error_condition(int ev) const noexcept;
2
#
Returns: An object of type error_condition that corresponds to ev.
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virtual bool equivalent(int code, const error_condition& condition) const noexcept;
3
#
Returns: true if, for the category of error represented by *this, code is considered equivalent to condition; otherwise, false.
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virtual bool equivalent(const error_code& code, int condition) const noexcept;
4
#
Returns: true if, for the category of error represented by *this, code is considered equivalent to condition; otherwise, false.