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
- ProcessHostServerConfig.cs
- ThemeDirectoryCompiler.cs
- Model3DCollection.cs
- ScriptResourceAttribute.cs
- QilReplaceVisitor.cs
- TableItemPattern.cs
- PropertyChangingEventArgs.cs
- StatusBar.cs
- PingOptions.cs
- ObjectDataSource.cs
- GenericTextProperties.cs
- DragAssistanceManager.cs
- Registry.cs
- SqlCacheDependency.cs
- InternalConfigConfigurationFactory.cs
- GroupQuery.cs
- SortExpressionBuilder.cs
- SchemaNamespaceManager.cs
- DecimalConverter.cs
- WebMessageEncodingElement.cs
- PerformanceCounterPermission.cs
- ParserContext.cs
- sqlstateclientmanager.cs
- SessionEndingEventArgs.cs
- _AutoWebProxyScriptEngine.cs
- QuaternionRotation3D.cs
- SystemException.cs
- TextBox.cs
- XmlEncodedRawTextWriter.cs
- TextLineBreak.cs
- PageTheme.cs
- SyndicationCategory.cs
- Transform3DGroup.cs
- CrossContextChannel.cs
- GridEntryCollection.cs
- ButtonBaseAdapter.cs
- ActiveXContainer.cs
- CheckBoxBaseAdapter.cs
- SchemaLookupTable.cs
- SelectedGridItemChangedEvent.cs
- XhtmlConformanceSection.cs
- GridViewColumnCollectionChangedEventArgs.cs
- CodeSubDirectoriesCollection.cs
- TextElement.cs
- SqlClientWrapperSmiStreamChars.cs
- HMACSHA512.cs
- TransformerTypeCollection.cs
- Point3DCollectionConverter.cs
- regiisutil.cs
- StringInfo.cs
- PathNode.cs
- PropertyPath.cs
- HttpStreamMessageEncoderFactory.cs
- IUnknownConstantAttribute.cs
- DrawingContextDrawingContextWalker.cs
- HttpWrapper.cs
- Oid.cs
- EventRoute.cs
- Set.cs
- FileDialogCustomPlace.cs
- HttpConfigurationSystem.cs
- LinearGradientBrush.cs
- ObjectHandle.cs
- RelationshipEndMember.cs
- MarkupObject.cs
- Codec.cs
- CqlParser.cs
- MimeMultiPart.cs
- StdRegProviderWrapper.cs
- SolidColorBrush.cs
- TypeNameParser.cs
- HttpListenerPrefixCollection.cs
- ClientBuildManagerCallback.cs
- QueryOutputWriter.cs
- ZoneLinkButton.cs
- EntityContainer.cs
- BindMarkupExtensionSerializer.cs
- TraceShell.cs
- Attachment.cs
- MaskedTextBoxDesigner.cs
- SafeEventLogWriteHandle.cs
- shaperfactory.cs
- FileRecordSequence.cs
- Activity.cs
- COSERVERINFO.cs
- Thread.cs
- DemultiplexingDispatchMessageFormatter.cs
- HtmlControl.cs
- InkPresenterAutomationPeer.cs
- MultiBindingExpression.cs
- XAMLParseException.cs
- DefaultBindingPropertyAttribute.cs
- ControlIdConverter.cs
- Paragraph.cs
- StreamWithDictionary.cs
- StreamWriter.cs
- QuaternionKeyFrameCollection.cs
- TouchEventArgs.cs
- SqlExpander.cs
- Bits.cs