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Elaborated that we can't generally add comparison operators to C structs

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Herb Sutter
2021-07-08 11:21:41 -07:00
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@@ -4565,6 +4565,10 @@ In particular, if a concrete type is copyable, prefer to also give it an equalit
##### Note
For structs intended to be shared with C code, defining `operator==` may not be feasible.
##### Note
Handles for resources that cannot be cloned, e.g., a `scoped_lock` for a `mutex`, are concrete types but typically cannot be copied (instead, they can usually be moved),
so they can't be regular; instead, they tend to be move-only.