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614016fecd
Simplify String.Index by sinking transcoded offsets into the .utf8 variant. This is in preparation for a more resilient index type capable of supporting existential string indices.
34 lines
1.2 KiB
Swift
34 lines
1.2 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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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extension String.UTF16View.Index {
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/// Construct from an integer offset.
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@available(swift, deprecated: 3.2)
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@available(swift, obsoleted: 4.0)
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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(encodedOffset: offset)
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}
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@available(swift, deprecated: 3.2)
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@available(swift, obsoleted: 4.0)
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public func distance(to other: String.UTF16View.Index?) -> Int {
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return _offset.distance(to: other!._offset)
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}
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@available(swift, deprecated: 3.2)
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@available(swift, obsoleted: 4.0)
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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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