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Document default types for associated values #41

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natecook1000 opened this issue Sep 15, 2018 · 2 comments
Open

Document default types for associated values #41

natecook1000 opened this issue Sep 15, 2018 · 2 comments
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Content issue A problem in with the book's prose, code, or figures

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@natecook1000
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Previous ID SR-8761
Radar None
Original Reporter @natecook1000
Type Improvement
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Labels Improvement
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Priority Medium

md5: 5483446fdf4d37083296d04e708f33f2

Issue Description:

We don't appear to document the way you can provide a default type in an associate's type declaration. Noted in https://forums.swift.org/t/a-question-about-associatedtype-in-protocols/16168
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@glbrntt glbrntt mentioned this issue Sep 7, 2022
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@schwa
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schwa commented Oct 5, 2022

This is used quite a fair bit in the standard library for doing things like providing a default implementation of a Collection's Slice type

associatedtype SubSequence : Collection = Slice<Self> where Self.Element == Self.SubSequence.Element, Self.SubSequence == Self.SubSequence.SubSequence

It seems strange that a really useful and used (at least in std lib) isn't documented at all in the Swift book

@natecook1000 natecook1000 mentioned this issue Oct 5, 2022
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@natecook1000
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Now that TSPL is open source, I've opened #40 to track this issue.

@amartini51 amartini51 reopened this Oct 5, 2022
@amartini51 amartini51 transferred this issue from apple/swift Oct 5, 2022
@amartini51 amartini51 changed the title [SR-8761] Document default types for associated values Document default types for associated values Oct 5, 2022
@amartini51 amartini51 added the Content issue A problem in with the book's prose, code, or figures label Oct 10, 2022
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@schwa @natecook1000 @amartini51