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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Collections / Generic / HashHelpers.cs / 1305376 / HashHelpers.cs
using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Runtime.ConstrainedExecution; using System.Text; namespace System.Collections.Generic { ////// Duplicated because internal to mscorlib /// internal static class HashHelpers { // Table of prime numbers to use as hash table sizes. // The entry used for capacity is the smallest prime number in this array // that is larger than twice the previous capacity. internal static readonly int[] primes = { 3, 7, 11, 17, 23, 29, 37, 47, 59, 71, 89, 107, 131, 163, 197, 239, 293, 353, 431, 521, 631, 761, 919, 1103, 1327, 1597, 1931, 2333, 2801, 3371, 4049, 4861, 5839, 7013, 8419, 10103, 12143, 14591, 17519, 21023, 25229, 30293, 36353, 43627, 52361, 62851, 75431, 90523, 108631, 130363, 156437, 187751, 225307, 270371, 324449, 389357, 467237, 560689, 672827, 807403, 968897, 1162687, 1395263, 1674319, 2009191, 2411033, 2893249, 3471899, 4166287, 4999559, 5999471, 7199369}; [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] internal static bool IsPrime(int candidate) { if ((candidate & 1) != 0) { int limit = (int)Math.Sqrt(candidate); for (int divisor = 3; divisor <= limit; divisor += 2) { if ((candidate % divisor) == 0) { return false; } } return true; } return (candidate == 2); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] internal static int GetPrime(int min) { Debug.Assert(min >= 0, "min less than zero; handle overflow checking before calling HashHelpers"); for (int i = 0; i < primes.Length; i++) { int prime = primes[i]; if (prime >= min) { return prime; } } // Outside of our predefined table. Compute the hard way. for (int i = (min | 1); i < Int32.MaxValue; i += 2) { if (IsPrime(i)) { return i; } } return min; } internal static int GetMinPrime() { return primes[0]; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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