Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Xml / System / Xml / Bits.cs / 1 / 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; } ////// 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); } ////// 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; } ////// 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); } ////// 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
- OdbcConnectionPoolProviderInfo.cs
- PersianCalendar.cs
- util.cs
- SoapIncludeAttribute.cs
- DataSysAttribute.cs
- ListBindingHelper.cs
- AttributeProviderAttribute.cs
- WinInetCache.cs
- ExtenderControl.cs
- ScrollItemProviderWrapper.cs
- glyphs.cs
- HotSpotCollection.cs
- ContextMenuService.cs
- SqlProcedureAttribute.cs
- SqlPersonalizationProvider.cs
- ClusterRegistryConfigurationProvider.cs
- ParseChildrenAsPropertiesAttribute.cs
- SerialStream.cs
- ByteAnimationBase.cs
- FastEncoderWindow.cs
- SQLDecimal.cs
- ItemCheckedEvent.cs
- FieldNameLookup.cs
- ToolStripDesigner.cs
- xmlformatgeneratorstatics.cs
- OdbcEnvironment.cs
- CollectionViewProxy.cs
- PictureBoxDesigner.cs
- TextChange.cs
- Html32TextWriter.cs
- OdbcDataReader.cs
- TypeHelpers.cs
- BamlWriter.cs
- ViewGenResults.cs
- LocalizedNameDescriptionPair.cs
- ClientFormsAuthenticationCredentials.cs
- StateMachineSubscription.cs
- BatchWriter.cs
- DeploymentExceptionMapper.cs
- CodeTypeMemberCollection.cs
- XmlQueryOutput.cs
- xml.cs
- Rect.cs
- ListDictionary.cs
- ToolTipService.cs
- InternalReceiveMessage.cs
- CustomErrorsSection.cs
- LogStream.cs
- HtmlShimManager.cs
- UrlParameterReader.cs
- SqlMethods.cs
- XmlAnyElementAttribute.cs
- BackEase.cs
- BitmapEffectDrawingContent.cs
- MetabaseSettingsIis7.cs
- ItemCollection.cs
- TabPanel.cs
- OleDbRowUpdatedEvent.cs
- coordinator.cs
- OutOfMemoryException.cs
- CacheDependency.cs
- InputBinding.cs
- InsufficientMemoryException.cs
- WorkflowWebHostingModule.cs
- XmlSchemaAttributeGroupRef.cs
- QilFactory.cs
- UnsafeNativeMethods.cs
- storagemappingitemcollection.viewdictionary.cs
- SafeSecurityHandles.cs
- MessageLoggingElement.cs
- BlobPersonalizationState.cs
- SqlBinder.cs
- TeredoHelper.cs
- BrowsableAttribute.cs
- CommonObjectSecurity.cs
- EntityCommandCompilationException.cs
- CallbackValidator.cs
- XPathChildIterator.cs
- DayRenderEvent.cs
- SessionState.cs
- AsymmetricAlgorithm.cs
- PartialCachingAttribute.cs
- TimeZone.cs
- CheckBoxRenderer.cs
- SetStateDesigner.cs
- Tuple.cs
- SiteMapDataSourceView.cs
- CallContext.cs
- RuleSet.cs
- DataSysAttribute.cs
- DependentList.cs
- QueryableDataSourceHelper.cs
- OutputCacheModule.cs
- SystemMulticastIPAddressInformation.cs
- TCPClient.cs
- BinaryOperationBinder.cs
- TextBoxRenderer.cs
- TextComposition.cs
- ExpressionConverter.cs
- BinaryCommonClasses.cs