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