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50 lines
1.3 KiB
Swift
50 lines
1.3 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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struct ZipGenerator2<E0 : Generator, E1 : Generator> : Generator
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{
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typealias Element = (E0.Element,E1.Element)
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init(_ e0: E0, _ e1: E1) {
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baseStreams = (e0,e1)
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}
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mutating func next() -> Element? {
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var e0 = baseStreams.0.next()
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if !e0 { return .None }
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var e1 = baseStreams.1.next()
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if !e1 { return .None }
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return .Some((e0!, e1!))
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}
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var baseStreams : (E0,E1)
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}
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struct Zip2<S0: Sequence, S1: Sequence> : Sequence
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{
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typealias Stream1 = S0.GeneratorType
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typealias Stream2 = S1.GeneratorType
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typealias GeneratorType = ZipGenerator2<Stream1, Stream2>
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init(_ s0: S0, _ s1: S1) {
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sequences = (s0,s1)
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}
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func generate() -> GeneratorType {
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return GeneratorType(
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sequences.0.generate(),
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sequences.1.generate())
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}
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var sequences: (S0,S1)
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}
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