
I learned a few quirks while writing this CL: * C++20 can synthesize operator!= from operator==, so we no longer have to define both. * C++20 can synthesize operator<=>, which synthesizes all of the other operators (==, !=, <, <=, >, >=). But if operator<=> is user-defined, i.e. if it is not `= default`, then == and != are *not* auto-generated and must be user-defined. (<, <=, >, and >= are still synthesized from a user-defined operator<=>.) * If operator<=> is `= default` but the definition is in the .cc file, then in other translation units, the operator<=> appears user-defined, and therefore the == and != are not generated. Therefore when using `= default`, it's best to put it in the header file. Bug: 40256175 Change-Id: I7ccd2bd0219a2e3db18c5d5d24bfc03d5bb54069 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6175640 Reviewed-by: Kenichi Ishibashi <bashi@chromium.org> Reviewed-by: Steven Bingler <bingler@chromium.org> Reviewed-by: Charlie Harrison <csharrison@chromium.org> Commit-Queue: Chris Fredrickson <cfredric@chromium.org> Cr-Commit-Position: refs/heads/main@{#1407994}
Chromium
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