Curious: why do you use classes instead of structs for implementations in swiftz?
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no reason. I'm probably going to end up switching them to structs where I can.
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developer.apple.com/library/prerel seems to mostly favor classes. Comments? Trying to grok perf of call-by-value.
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YES. Please more re: note there that "Swift manages all value copying to ensure optimal performance"
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For instance: what if I wanted to do the unshare() trick for a struct of mine? How do I do that?
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You don't have to do the unshare() trick for a your structs because they're effectively passed by-value.
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is there a way make immutable arrays or should they be unshared at every API boundary?
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Not presently; and depends on your requirements.
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