[Bug c++/96489] Three way comparison operator failure to synthesize traditional comparitors

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96489

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to DV Henkel-Wallace from comment #7)
> Thanks.  That is clear.
> 
> BTW FWIW, defining <=> myself and then defining == default does appear to do
> what I want (i.e. I don't have to use. = default with both operators).

Right, that's what I said (or tried to say) in comment 3:

  "I think to get what you expect, you need to either define <=> as defaulted,
   or define == as defaulted."

Either works fine, it doesn't need to be both.

> saw that cppreference claims that `== default` will do `<=> < 0` -- though I
> know that site isn't authoritative, merely close to authorotative.

https://en.cppreference.com/w/cpp/language/default_comparisons seems correct,
although it notes:

  This section is incomplete
  Reason: Defaulted equality comparisons