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
#
Returns: A string naming the error category.
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virtual error_condition default_error_condition(int ev) const noexcept;
2
#
Returns: error_­condition(ev, *this).
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virtual bool equivalent(int code, const error_condition& condition) const noexcept;
3
#
Returns: default_­error_­condition(code) == condition.
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virtual bool equivalent(const error_code& code, int condition) const noexcept;
4
#
Returns: *this == code.category() && code.value() == condition.
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virtual string message(int ev) const = 0;
5
#
Returns: A string that describes the error condition denoted by ev.