[swift-evolution] [Pitch] Non-class type requirements on protocols (eg : struct, : enum)

[Adrian Zubarev]

Does this constraint exclude COW or are we still allowed to have a reference type for storage behind the scenes?

-- 
Adrian Zubarev
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Am 21. Oktober 2016 um 19:50:31, Dave Abrahams via swift-evolution (swift-evolution at swift.org) schrieb:

I'm not sure what you mean by “data-only,” but the constraint I want is
“has value semantics.”
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