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Showing content from https://timsong-cpp.github.io/cppwp/n4140/syserr.errcat.virtuals below:

[syserr.errcat.virtuals]

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

virtual ~error_category();

Effects: Destroys an object of class error_category.

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: error_condition(ev, *this).

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

Returns: default_error_condition(code) == condition.

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

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

virtual string message(int ev) const = 0;

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


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