Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / Bits.cs / 1305376 / Bits.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System; using System.Diagnostics; ////// Contains static utility methods used to manipulate bits in a word. /// internal static class Bits { private static readonly uint MASK_0101010101010101 = 0x55555555; private static readonly uint MASK_0011001100110011 = 0x33333333; private static readonly uint MASK_0000111100001111 = 0x0f0f0f0f; private static readonly uint MASK_0000000011111111 = 0x00ff00ff; private static readonly uint MASK_1111111111111111 = 0x0000ffff; ////// Returns the number of 1 bits in an unsigned integer. Counts bits by divide-and-conquer method, /// first computing 16 2-bit counts, then 8 4-bit counts, then 4 8-bit counts, then 2 16-bit counts, /// and finally 1 32-bit count. /// public static int Count(uint num) { num = (num & MASK_0101010101010101) + ((num >> 1) & MASK_0101010101010101); num = (num & MASK_0011001100110011) + ((num >> 2) & MASK_0011001100110011); num = (num & MASK_0000111100001111) + ((num >> 4) & MASK_0000111100001111); num = (num & MASK_0000000011111111) + ((num >> 8) & MASK_0000000011111111); num = (num & MASK_1111111111111111) + (num >> 16); return (int) num; } ////// Returns true if the unsigned integer has exactly one bit set. /// public static bool ExactlyOne(uint num) { return num != 0 && (num & (num - 1)) == 0; } #if !SILVERLIGHT // These methods are not used in Silverlight ////// Returns true if the unsigned integer has more than one bit set. /// public static bool MoreThanOne(uint num) { return (num & (num - 1)) != 0; } ////// Clear the least significant bit that is set and return the result. /// public static uint ClearLeast(uint num) { return num & (num - 1); } #endif ////// Compute the 1-based position of the least sigificant bit that is set, and return it (return 0 if no bits are set). /// (e.g. 0x1001100 will return 3, since the 3rd bit is set). /// public static int LeastPosition(uint num) { if (num == 0) return 0; return Count(num ^ (num - 1)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System; using System.Diagnostics; ////// Contains static utility methods used to manipulate bits in a word. /// internal static class Bits { private static readonly uint MASK_0101010101010101 = 0x55555555; private static readonly uint MASK_0011001100110011 = 0x33333333; private static readonly uint MASK_0000111100001111 = 0x0f0f0f0f; private static readonly uint MASK_0000000011111111 = 0x00ff00ff; private static readonly uint MASK_1111111111111111 = 0x0000ffff; ////// Returns the number of 1 bits in an unsigned integer. Counts bits by divide-and-conquer method, /// first computing 16 2-bit counts, then 8 4-bit counts, then 4 8-bit counts, then 2 16-bit counts, /// and finally 1 32-bit count. /// public static int Count(uint num) { num = (num & MASK_0101010101010101) + ((num >> 1) & MASK_0101010101010101); num = (num & MASK_0011001100110011) + ((num >> 2) & MASK_0011001100110011); num = (num & MASK_0000111100001111) + ((num >> 4) & MASK_0000111100001111); num = (num & MASK_0000000011111111) + ((num >> 8) & MASK_0000000011111111); num = (num & MASK_1111111111111111) + (num >> 16); return (int) num; } ////// Returns true if the unsigned integer has exactly one bit set. /// public static bool ExactlyOne(uint num) { return num != 0 && (num & (num - 1)) == 0; } #if !SILVERLIGHT // These methods are not used in Silverlight ////// Returns true if the unsigned integer has more than one bit set. /// public static bool MoreThanOne(uint num) { return (num & (num - 1)) != 0; } ////// Clear the least significant bit that is set and return the result. /// public static uint ClearLeast(uint num) { return num & (num - 1); } #endif ////// Compute the 1-based position of the least sigificant bit that is set, and return it (return 0 if no bits are set). /// (e.g. 0x1001100 will return 3, since the 3rd bit is set). /// public static int LeastPosition(uint num) { if (num == 0) return 0; return Count(num ^ (num - 1)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ServiceModelStringsVersion1.cs
- HttpCapabilitiesEvaluator.cs
- MachineKeyConverter.cs
- TraceSection.cs
- StrokeCollectionDefaultValueFactory.cs
- CategoryNameCollection.cs
- WaitForChangedResult.cs
- RsaSecurityKey.cs
- MissingMethodException.cs
- xmlsaver.cs
- BrushValueSerializer.cs
- ObjectStorage.cs
- ZipIOLocalFileDataDescriptor.cs
- GenerateScriptTypeAttribute.cs
- MessageCredentialType.cs
- ActivityTypeCodeDomSerializer.cs
- XmlDocumentType.cs
- TabControl.cs
- DataShape.cs
- DBCSCodePageEncoding.cs
- FontCacheUtil.cs
- MimeMultiPart.cs
- RequiredAttributeAttribute.cs
- TextTreeDeleteContentUndoUnit.cs
- JournalNavigationScope.cs
- ClientSettingsStore.cs
- RunClient.cs
- WindowsListViewGroup.cs
- MenuItemStyle.cs
- TextRangeEditTables.cs
- Transform.cs
- ContextMenuAutomationPeer.cs
- SelectionItemPattern.cs
- SqlConnectionFactory.cs
- ByeMessage11.cs
- Ray3DHitTestResult.cs
- CmsInterop.cs
- BrushConverter.cs
- WindowsUpDown.cs
- DrawListViewColumnHeaderEventArgs.cs
- SoapIgnoreAttribute.cs
- PropertyGrid.cs
- LambdaCompiler.Logical.cs
- basenumberconverter.cs
- BrowserCapabilitiesCodeGenerator.cs
- DynamicField.cs
- UIElementAutomationPeer.cs
- SafeUserTokenHandle.cs
- PropertyStore.cs
- RtType.cs
- LineSegment.cs
- Queue.cs
- PhysicalFontFamily.cs
- SqlCacheDependencyDatabaseCollection.cs
- GetLedgerEntryForRecipientRequest.cs
- BaseCodeDomTreeGenerator.cs
- AvtEvent.cs
- listitem.cs
- DocumentXmlWriter.cs
- ClientConfigPaths.cs
- SafeArrayRankMismatchException.cs
- InheritedPropertyChangedEventArgs.cs
- TakeQueryOptionExpression.cs
- HttpProfileGroupBase.cs
- WindowsFont.cs
- WindowsContainer.cs
- EntityParameterCollection.cs
- SettingsBindableAttribute.cs
- Control.cs
- ButtonAutomationPeer.cs
- ServiceDescriptionImporter.cs
- SystemIPGlobalProperties.cs
- NativeMethods.cs
- SecureStringHasher.cs
- WindowsFormsEditorServiceHelper.cs
- WorkflowMarkupSerializationException.cs
- ProtocolElementCollection.cs
- X509Chain.cs
- LazyTextWriterCreator.cs
- ExportOptions.cs
- StringHelper.cs
- BrowserCapabilitiesFactoryBase.cs
- BookmarkScope.cs
- TokenBasedSetEnumerator.cs
- DrawingCollection.cs
- BindingMAnagerBase.cs
- DataSourceExpression.cs
- Type.cs
- CancellableEnumerable.cs
- InvalidWMPVersionException.cs
- DebugView.cs
- DynamicPhysicalDiscoSearcher.cs
- XamlFilter.cs
- PrintPreviewDialog.cs
- ScrollViewerAutomationPeer.cs
- Process.cs
- HttpWebResponse.cs
- ClientUrlResolverWrapper.cs
- ControlParameter.cs
- BadImageFormatException.cs