22 Diagnostics library [diagnostics]

22.5 System error support [syserr]

22.5.2 Class error_­category [syserr.errcat]

22.5.2.2 Class error_­category virtual members [syserr.errcat.virtuals]

virtual ~error_category();

1
#

Effects: Destroys an object of class error_­category.

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

2
#

Returns: A string naming the error category.

virtual error_condition default_error_condition(int ev) const noexcept;

3
#

Returns: error_­condition(ev, *this).

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

4
#

Returns: default_­error_­condition(code) == condition.

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

5
#

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

virtual string message(int ev) const = 0;

6
#

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