[swift-evolution] Bit arrays

Xiaodi Wu xiaodi.wu at gmail.com
Sun Jul 3 17:49:57 CDT 2016

As an additive thing, probably not much chance of seeing it in Swift 3,

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.

On Sun, Jul 3, 2016 at 17:45 Chris Lattner via swift-evolution <
swift-evolution at swift.org> wrote:

> > On Jul 3, 2016, at 2:42 PM, Daryle Walker via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > 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?
> It has to be a separate “bitvector” type.
> 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.
> -Chris
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