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24 lines
970 B
Swift
24 lines
970 B
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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// 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 : RandomAccessIndexType {
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public func distanceTo(x: String.UTF16View.Index) -> Int {
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return x._offset - _offset
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}
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public func advancedBy(x: Int) -> String.UTF16View.Index {
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return String.UTF16View.Index(_offset: _offset + x)
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}
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}
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