[swift-evolution] [Pitch] Self.withoutSpecialization

[T.J. Usiyan]

Bump

On Fri, Jul 1, 2016 at 11:56 AM, T.J. Usiyan <griotspeak at gmail.com> wrote:

>
>
> ## The Issue
> Given
> ``` swift
> public protocol Zipper1D : CustomStringConvertible {
>     associatedtype Element
> }
> ```
>
> We can almost write a `flatMap`  which keeps the general identity of self
> and swaps out the Element in the output.
>
> ``` swift
> func flatMap<
>         NewElement, SegmentOfResult : Collection, Output : Zipper1D where
>         SegmentOfResult.Iterator.Element == NewElement, Output.Element ==
> NewElement>
>         (_ transform: @noescape (Element) throws -> SegmentOfResult)
> rethrows -> Output
> ```
>
> ## The Proposal
> I propose that we allow `Type.withoutSpecialization`
>
> ``` swift
> func flatMap<
>         NewElement, SegmentOfResult : Collection, Output : Zipper1D where
>         SegmentOfResult.Iterator.Element == NewElement, Output.Element ==
> NewElement, Output.withoutSpecialization == Self.withoutSepcialization>
>         (_ transform: @noescape (Element) throws -> SegmentOfResult)
> rethrows -> Output
> ```
>
>
> I recognize that generic protocols are another possible solution to this
> problem. I am pitching this because of how much closer this idea seems to
> being realized.
>
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