[swift-evolution] Open Issues Affecting Standard Library API Stability

[Dmitri Gribenko]

On Wed, Jul 6, 2016 at 4:21 AM, Karl <razielim at gmail.com> wrote:
> I had a PR open for this which added a Collection specialisation, but you
> said this could be handled in a more general way which allows for more
> optimised mutations. I’m curious how this would work; how does
> `RangeReplaceableCollection.replaceSubrange<S:Sequence>(range:, with: S)`
> call a more optimised implementation if S also conforms to Collection, if
> not by adding a specialisation?

The RRC can call into S.someCustomizationPoint(), which will
initialize a region of memory in the most efficient way possible,
since it has complete knowledge about the memory layout of S.

Dmitri

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