As an additive thing, probably not much chance of seeing it in Swift 3, then?<br><br>I tried wrapping CFBitVector just the other day but found performance to be rather lacking for a number of operations because CF doesn't expose the underlying storage. It would be nice to have something in the stdlib and I'd be happy to contribute to proposal and/or implementation.<br><br><div class="gmail_quote"><div dir="ltr">On Sun, Jul 3, 2016 at 17:45 Chris Lattner via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
> On Jul 3, 2016, at 2:42 PM, Daryle Walker via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:<br>
><br>
> Since objects aren't addressable by default, there wouldn't be the problems with a bit-packed Boolean collection that C++'s "vector<bool>" has. Does "[Bool]" currently have the option of packed optimization, or would it have to be added via a proposal? Or does it have to be a separate type instead?<br>
<br>
It has to be a separate “bitvector” type.<br>
<br>
FWIW, C++’s vector<bool> optimization is widely considered to be a bad idea, and many people have talked about trying to remove it from the C++ standard entirely.<br>
<br>
-Chris<br>
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