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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Some fancier specifics: the compiler has enough info that it could pass stack structs byref in simple cases.
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Right, if no mutating in callee. So what are non-simple cases / why does array need to be special?
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Basically array is special because it allows broader sharing of the backing buffer across array ops.
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That's what I'd like more than 140 chars on, yeah. :) Impl of pass-by-val array + un/shared backing.
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Hopefully one day you'll be able to read stdlib/Array.swift, but I still haven't heard about that.
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