Change in String.CharacterView.Index?

iachievedit · 2016-05-08T17:58:39.000Z

Howdy,

I've been building the latest Swift 3.0 and noticed that between Apr 25 and
today that String.CharacterView.Index.advance(by:) is no longer available.

This runs with an Apr 25 build (Swift 255544591c to be exact)
let string:String = "Hello, world!"
print(string.startIndex)
print(string.startIndex.advanced(by:1))

It fails with a build today (May 8, Swift 26fcf1ab4a):
test.swift:3:14: error: value of type 'Index' (aka
'String.CharacterView.Index') has no member 'advanced'
print(string.startIndex.advanced(by:1))
~~~~~~~^~~~~~~~~~ ~~~~~~~~

I don't know who runs swiftdoc.org but it is handy, and shows advanced(by:)
a valid method:

SwiftDoc.org

String.CharacterView.Index

Swift documentation for 'String.CharacterView.Index': A position in a string's CharacterView instance.

Not sure what I'm missing here!

Thanks,
Joe

···

--
Joseph Bell

iAchieved.it

iAchieved.it | Thoughts from a Technology Leader

Thoughts from a Technology Leader | iAchieved.it

@iachievedit

Dennis_Weissmann · 2016-05-08T20:15:58.000Z

Hey Joe,

The collection index model changed:

github.com

apple/swift-evolution/blob/main/proposals/0065-collections-move-indices.md

# A New Model for Collections and Indices

* Proposal: [SE-0065](0065-collections-move-indices.md)
* Authors: [Dmitri Gribenko](https://github.com/gribozavr), [Dave Abrahams](https://github.com/dabrahams), [Maxim Moiseev](https://github.com/moiseev)
* Review Manager: [Chris Lattner](https://github.com/lattner)
* Status: **Implemented (Swift 3)**
* Decision Notes: [Rationale](https://forums.swift.org/t/accepted-se-0065-a-new-model-for-collections/2371), [Swift-evolution thread](https://forums.swift.org/t/rfc-new-collections-model-collections-advance-indices/1643)
* Implementation: [apple/swift#2108](https://github.com/apple/swift/pull/2108)
* Previous Revisions: [1](https://github.com/apple/swift-evolution/blob/21fac2e8034e79e4f44c1c8799808fc8cba83395/proposals/0065-collections-move-indices.md), [2](https://github.com/apple/swift-evolution/blob/1a821cf7ccbdf1d7566e9ce2e991bdd835ba3b7d/proposals/0065-collections-move-indices.md), [3](https://github.com/apple/swift-evolution/blob/d44c3e7c189ba39ddf8a914ae8b78b71f88fdcdf/proposals/0065-collections-move-indices.md), [4](https://github.com/apple/swift-evolution/blob/57639040dc08d2f0b16d9bda527db069589b58d1/proposals/0065-collections-move-indices.md)

## Summary

We propose a new model for `Collection`s wherein responsibility for
index traversal is moved from the index to the collection itself.  For
example, instead of writing `i.successor()`, one would write
`c.index(after: i)`.  We also propose the following changes as a
consequence of the new model:

* A collection's `Index` can be any `Comparable` type.
* The distinction between intervals and ranges disappears, leaving

This file has been truncated. show original

You now need to ask the collection for the next index:

let a = “Hello, World"
let secondIndex = a.characters.index(after: a.characters.startIndex)
print(a.characters[secondIndex]) // prints "e"

- Dennis

···

On May 8, 2016, at 7:58 PM, Joseph Bell via swift-corelibs-dev <swift-corelibs-dev@swift.org> wrote:

Howdy,

I've been building the latest Swift 3.0 and noticed that between Apr 25 and today that String.CharacterView.Index.advance(by:) is no longer available.

This runs with an Apr 25 build (Swift 255544591c to be exact)
let string:String = "Hello, world!"
print(string.startIndex)
print(string.startIndex.advanced(by:1))

It fails with a build today (May 8, Swift 26fcf1ab4a):
test.swift:3:14: error: value of type 'Index' (aka 'String.CharacterView.Index') has no member 'advanced'
print(string.startIndex.advanced(by:1))
~~~~~~~^~~~~~~~~~ ~~~~~~~~

I don't know who runs swiftdoc.org <http://swiftdoc.org/> but it is handy, and shows advanced(by:) a valid method:
String.CharacterView.Index — SwiftDoc.org

Not sure what I'm missing here!

Thanks,
Joe

--
Joseph Bell
iAchieved.it – Thoughts from a Technology Leader
@iachievedit
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