Code:
/ 4.0 / 4.0 / 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. 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- EpmSourcePathSegment.cs
- TrackPointCollection.cs
- Config.cs
- RightsManagementEncryptedStream.cs
- DataBoundControlAdapter.cs
- WebControlAdapter.cs
- WSSecurityTokenSerializer.cs
- BindingSource.cs
- GlyphElement.cs
- ChannelServices.cs
- BitmapDownload.cs
- ControlCachePolicy.cs
- OLEDB_Enum.cs
- WorkflowInstanceExtensionManager.cs
- DifferencingCollection.cs
- FileClassifier.cs
- AuthStoreRoleProvider.cs
- WebServiceData.cs
- HandlerFactoryCache.cs
- ValidatingCollection.cs
- ConstructorNeedsTagAttribute.cs
- ScriptReferenceEventArgs.cs
- SuppressMessageAttribute.cs
- SRDisplayNameAttribute.cs
- ToolStripItem.cs
- XmlQueryCardinality.cs
- EmptyElement.cs
- COM2DataTypeToManagedDataTypeConverter.cs
- EncoderBestFitFallback.cs
- CustomCategoryAttribute.cs
- DbMetaDataCollectionNames.cs
- BamlLocalizer.cs
- PropertyEmitter.cs
- SourceItem.cs
- DataRecord.cs
- BoundsDrawingContextWalker.cs
- BamlResourceSerializer.cs
- X509CertificateStore.cs
- MainMenu.cs
- MsdtcClusterUtils.cs
- PreservationFileReader.cs
- DrawingContextWalker.cs
- ProviderSettings.cs
- SymLanguageVendor.cs
- ToolStripLabel.cs
- ListMarkerLine.cs
- ButtonFlatAdapter.cs
- DateTimeFormat.cs
- ExpressionBuilderCollection.cs
- RelatedPropertyManager.cs
- PageSettings.cs
- ToolStripLocationCancelEventArgs.cs
- Debug.cs
- EdmFunctionAttribute.cs
- DiscoveryMessageSequence.cs
- Win32.cs
- GeneralTransform3D.cs
- XslTransform.cs
- OSEnvironmentHelper.cs
- Setter.cs
- WrappedReader.cs
- PointCollection.cs
- userdatakeys.cs
- BasicExpandProvider.cs
- IfAction.cs
- RootAction.cs
- PrimaryKeyTypeConverter.cs
- TreeWalkHelper.cs
- Opcode.cs
- InvalidDataContractException.cs
- QueryReaderSettings.cs
- FtpCachePolicyElement.cs
- CleanUpVirtualizedItemEventArgs.cs
- DataAccessor.cs
- WorkflowDefinitionDispenser.cs
- SQlBooleanStorage.cs
- HashSetEqualityComparer.cs
- PageThemeParser.cs
- WebConfigurationHostFileChange.cs
- ICspAsymmetricAlgorithm.cs
- WebPartConnectionsConfigureVerb.cs
- TableHeaderCell.cs
- LostFocusEventManager.cs
- EventTask.cs
- Vector3D.cs
- GlyphTypeface.cs
- ProfessionalColorTable.cs
- StandardTransformFactory.cs
- OleDbRowUpdatedEvent.cs
- Simplifier.cs
- Matrix3DValueSerializer.cs
- MenuStrip.cs
- SendAgentStatusRequest.cs
- DurationConverter.cs
- followingsibling.cs
- LabelTarget.cs
- XamlPathDataSerializer.cs
- MenuRendererClassic.cs
- CodeVariableDeclarationStatement.cs
- ClipboardData.cs