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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // | ||
| // Zip3Sequence.swift | ||
| // CoreUtil | ||
| // | ||
| // Created by yuki on 2022/01/22. | ||
| // Copyright © 2022 yuki. All rights reserved. | ||
| // | ||
|
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| public func zip<A: Sequence, B: Sequence, C: Sequence>(_ a: A, _ b: B, _ c: C) -> Zip3Sequence<A, B, C> { | ||
| Zip3Sequence(a, b, c) | ||
| } | ||
| public func zip<A: Sequence, B: Sequence, C: Sequence, D: Sequence>(_ a: A, _ b: B, _ c: C, _ d: D) -> Zip4Sequence<A, B, C, D> { | ||
| Zip4Sequence(a, b, c, d) | ||
| } | ||
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| public struct Zip3Sequence<A: Sequence, B: Sequence, C: Sequence>: Sequence { | ||
| public typealias Element = (A.Element, B.Element, C.Element) | ||
|
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| public let a: A | ||
| public let b: B | ||
| public let c: C | ||
|
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| public struct Iterator: IteratorProtocol { | ||
| var a: A.Iterator | ||
| var b: B.Iterator | ||
| var c: C.Iterator | ||
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| mutating public func next() -> Element? { | ||
| if let a = a.next(), let b = b.next(), let c = c.next() { return (a, b, c) }; return nil | ||
| } | ||
| } | ||
|
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| public func makeIterator() -> Iterator { Iterator(a: a.makeIterator(), b: b.makeIterator(), c: c.makeIterator()) } | ||
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| init(_ a: A, _ b: B, _ c: C) { | ||
| self.a = a | ||
| self.b = b | ||
| self.c = c | ||
| } | ||
| } | ||
|
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| public struct Zip4Sequence<A: Sequence, B: Sequence, C: Sequence, D: Sequence>: Sequence { | ||
| public typealias Element = (A.Element, B.Element, C.Element, D.Element) | ||
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| public let a: A | ||
| public let b: B | ||
| public let c: C | ||
| public let d: D | ||
|
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| public struct Iterator: IteratorProtocol { | ||
| var a: A.Iterator | ||
| var b: B.Iterator | ||
| var c: C.Iterator | ||
| var d: D.Iterator | ||
|
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| mutating public func next() -> Element? { | ||
| if let a = a.next(), let b = b.next(), let c = c.next(), let d = d.next() { return (a, b, c, d) }; return nil | ||
| } | ||
| } | ||
|
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| public func makeIterator() -> Iterator { Iterator(a: a.makeIterator(), b: b.makeIterator(), c: c.makeIterator(), d: d.makeIterator()) } | ||
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| init(_ a: A, _ b: B, _ c: C, _ d: D) { | ||
| self.a = a | ||
| self.b = b | ||
| self.c = c | ||
| self.d = d | ||
| } | ||
| } |
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