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27 lines
902 B
Swift
27 lines
902 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 - 2018 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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/// A linear congruential generator with user-specified seed value. Useful for generating a predictable "random" number sequence.
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public struct SimpleLCG: RandomNumberGenerator {
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var state: UInt64
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public init(seed: UInt64) {
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state = seed
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}
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public mutating func next() -> UInt64 {
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state = state &* 6364136223846793005 &+ 1442695040888963407
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return state
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}
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}
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