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35 lines
1.3 KiB
Swift
35 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 - 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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// Random access for String.UTF16View, only when Foundation is
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// imported. Making this API dependent on Foundation decouples the
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// Swift core from a UTF16 representation.
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extension String.UTF16View.Index : Strideable {
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/// Construct from an integer offset.
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public init(_ offset: Int) {
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_precondition(offset >= 0, "Negative UTF16 index offset not allowed")
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self.init(_offset: offset)
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}
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public func distance(to other: String.UTF16View.Index) -> Int {
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return other._offset.distance(to: _offset)
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}
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public func advanced(by n: Int) -> String.UTF16View.Index {
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return String.UTF16View.Index(_offset.advanced(by: n))
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}
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}
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extension String.UTF16View : RandomAccessCollection {}
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extension String.UTF16View.Indices : RandomAccessCollection {}
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