[swift-evolution] Bit arrays

[Chris Lattner]

> 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