mirror of
https://github.com/apple/swift-argument-parser.git
synced 2026-05-07 20:12:41 +00:00
Nate Cook
27 lines
831 B
Swift
27 lines
831 B
Swift
//===----------------------------------------------------------*- swift -*-===//
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//
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// This source file is part of the Swift Argument Parser open source project
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//
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// Copyright (c) 2020 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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//
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//===----------------------------------------------------------------------===//
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struct SplitMix64: RandomNumberGenerator {
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private var state: UInt64
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init(seed: UInt64) {
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self.state = seed
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}
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mutating func next() -> UInt64 {
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self.state &+= 0x9e3779b97f4a7c15
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var z: UInt64 = self.state
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z = (z ^ (z &>> 30)) &* 0xbf58476d1ce4e5b9
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z = (z ^ (z &>> 27)) &* 0x94d049bb133111eb
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return z ^ (z &>> 31)
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}
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}
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