[swift-corelibs-dev] [Proposal] RangeReplaceableCollection should inherits from MutableCollection

Tony Parker anthony.parker at apple.com
Sat Dec 2 14:19:35 CST 2017

Hi Jiannan,

I think you’ll get a better answer to your question on the ‘swift-dev’ list, actually.

Hope this helps,
- Tony

> On Dec 2, 2017, at 9:08 AM, Cao, Jiannan via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> Hi everyone,
> I'd like to discuss the relation between RangeReplaceableCollection and MutableCollection
> MutableCollection is a Collection type that can { set } any element with subscript(position: Index). (and also { set } for subscript(range: Range<Index>))
> RangeReplaceableCollection requires a function replaceRange(_:with:)
> If a type conforms to RangeReplaceableCollection, it means any of its range can be replaced, that includes the situation to replace only one element.
> So if some type conforms to RangeReplaceableCollection, it is sufficient to be a MutableCollection.
> So I think the RangeReplaceableCollection should conforms to MutableCollection should inherits from MutableCollection.
> Thanks!
> Jiannan
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