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ccda8f33d1
Adds an explicit @escaping throughout the standard library, validation test suite, and tests. This will be necessary as soon as noescape is the default for closure parameters.
59 lines
1.6 KiB
Swift
59 lines
1.6 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 - 2016 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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// This file contains "existentials" for the protocols defined in
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// Policy.swift. Similar components should usually be defined next to
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// their respective protocols.
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internal struct _CollectionOf<
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IndexType : Strideable, Element
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> : Collection {
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internal init(
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_startIndex: IndexType, endIndex: IndexType,
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_ subscriptImpl: @escaping (IndexType) -> Element
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) {
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self.startIndex = _startIndex
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self.endIndex = endIndex
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self._subscriptImpl = subscriptImpl
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}
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/// Returns an iterator over the elements of this sequence.
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///
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/// - Complexity: O(1).
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func makeIterator() -> AnyIterator<Element> {
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var index = startIndex
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return AnyIterator {
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() -> Element? in
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if _fastPath(index != self.endIndex) {
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self.formIndex(after: &index)
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return self._subscriptImpl(index)
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}
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return nil
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}
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}
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internal let startIndex: IndexType
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internal let endIndex: IndexType
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internal func index(after i: IndexType) -> IndexType {
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return i.advanced(by: 1)
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}
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internal subscript(i: IndexType) -> Element {
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return _subscriptImpl(i)
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}
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internal let _subscriptImpl: (IndexType) -> Element
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}
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