22 Diagnostics library [diagnostics]

22.5 System error support [syserr]

22.5.2 Class error_­category [syserr.errcat]

22.5.2.4 Program defined classes derived from error_­category [syserr.errcat.derived]

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

1
#

Returns: A string naming the error category.

virtual error_condition default_error_condition(int ev) const noexcept;

2
#

Returns: An object of type error_­condition that corresponds to ev.

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.

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.