File: 0192-rdar39826863.swift

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (34 lines) | stat: -rw-r--r-- 779 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
// RUN: %target-swift-frontend -emit-ir %s

protocol Tuple {
  associatedtype Head
  associatedtype Tail : Tuple
}

extension Pair : Tuple where Second : Tuple {
  typealias Head = First
  typealias Tail = Second
}

protocol HomogeneousTuple : Tuple, Collection
  where Tail : HomogeneousTuple, Head == Tail.Head {}

extension HomogeneousTuple {
  typealias Element = Head
  typealias Index = Int

  var startIndex: Int { return 0 }
  var endIndex: Int { return 0 }
  func index(after i: Int) -> Int { return i + 1 }

  subscript(n: Int) -> Head {
      fatalError()
  }
}

extension Pair : Sequence, Collection, HomogeneousTuple
  where Second : HomogeneousTuple, First == Second.Head {
  typealias Iterator = IndexingIterator<Pair<Head, Tail>>
}

struct Pair<First, Second> {}