Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Utility / ItemMap.cs / 1305600 / ItemMap.cs
using System; using System.Collections; using System.Diagnostics; namespace MS.Utility { // // ItemStructMap// // Disable warnings about fields never being assigned to // This struct is designed to function with its fields starting at // their default values and without the need of surfacing a constructor // other than the deafult #pragma warning disable 649 internal struct ItemStructMap { public int EnsureEntry(int key) { int index = Search(key); if (index < 0) { // Not found, add Entry // Create initial capacity, if necessary if (Entries == null) { Entries = new Entry[SearchTypeThreshold]; } // Convert not-found index to insertion point index = ~index; Entry[] destEntries = Entries; // Increase capacity, if necessary if ((Count + 1) > Entries.Length) { destEntries = new Entry[Entries.Length * 2]; // Initialize start of new array Array.Copy(Entries, 0, destEntries, 0, index); } // Shift entries to make room for new key at provided insertion point Array.Copy(Entries, index, destEntries, index + 1, Count - index); // Ensure Source and Destination arrays are the same Entries = destEntries; // Clear new entry Entries[index] = EmptyEntry; // Set Entries[index].Key = key; Count++; } return index; } public int Search(int key) { int keyPv = Int32.MaxValue; int iPv = 0; // Use fastest search based on size if (Count > SearchTypeThreshold) { // Binary Search int iLo = 0; int iHi = Count - 1; while (iLo <= iHi) { iPv = (iHi + iLo) / 2; keyPv = Entries[iPv].Key; if (key == keyPv) { return iPv; } if (key < keyPv) { iHi = iPv - 1; } else { iLo = iPv + 1; } } } else { // Linear search for (int i = 0; i < Count; i++) { iPv = i; keyPv = Entries[iPv].Key; if (key == keyPv) { return iPv; } if (key < keyPv) { break; } } } // iPv and keyPv will match and have the last pivot check // Return a negative value whose bitwise compliment // is this index of the first Entry that is greater // than the key passed in (sorted insertion point) if (key > keyPv) { iPv++; } return ~iPv; } private const int SearchTypeThreshold = 4; public Entry[] Entries; public int Count; public struct Entry { public int Key; public T Value; } private static Entry EmptyEntry; } #pragma warning restore 649 } // 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.Diagnostics; namespace MS.Utility { // // ItemStructMap // // Disable warnings about fields never being assigned to // This struct is designed to function with its fields starting at // their default values and without the need of surfacing a constructor // other than the deafult #pragma warning disable 649 internal struct ItemStructMap { public int EnsureEntry(int key) { int index = Search(key); if (index < 0) { // Not found, add Entry // Create initial capacity, if necessary if (Entries == null) { Entries = new Entry[SearchTypeThreshold]; } // Convert not-found index to insertion point index = ~index; Entry[] destEntries = Entries; // Increase capacity, if necessary if ((Count + 1) > Entries.Length) { destEntries = new Entry[Entries.Length * 2]; // Initialize start of new array Array.Copy(Entries, 0, destEntries, 0, index); } // Shift entries to make room for new key at provided insertion point Array.Copy(Entries, index, destEntries, index + 1, Count - index); // Ensure Source and Destination arrays are the same Entries = destEntries; // Clear new entry Entries[index] = EmptyEntry; // Set Entries[index].Key = key; Count++; } return index; } public int Search(int key) { int keyPv = Int32.MaxValue; int iPv = 0; // Use fastest search based on size if (Count > SearchTypeThreshold) { // Binary Search int iLo = 0; int iHi = Count - 1; while (iLo <= iHi) { iPv = (iHi + iLo) / 2; keyPv = Entries[iPv].Key; if (key == keyPv) { return iPv; } if (key < keyPv) { iHi = iPv - 1; } else { iLo = iPv + 1; } } } else { // Linear search for (int i = 0; i < Count; i++) { iPv = i; keyPv = Entries[iPv].Key; if (key == keyPv) { return iPv; } if (key < keyPv) { break; } } } // iPv and keyPv will match and have the last pivot check // Return a negative value whose bitwise compliment // is this index of the first Entry that is greater // than the key passed in (sorted insertion point) if (key > keyPv) { iPv++; } return ~iPv; } private const int SearchTypeThreshold = 4; public Entry[] Entries; public int Count; public struct Entry { public int Key; public T Value; } private static Entry EmptyEntry; } #pragma warning restore 649 } // 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
- ClearTypeHintValidation.cs
- ContentFileHelper.cs
- brushes.cs
- HtmlTextBoxAdapter.cs
- DataGridViewComboBoxColumn.cs
- UnicodeEncoding.cs
- PartialList.cs
- SafeHandle.cs
- Vars.cs
- CharacterHit.cs
- ProtectedConfigurationProviderCollection.cs
- XmlSchemaSimpleContentRestriction.cs
- FontNamesConverter.cs
- TabPage.cs
- XamlInterfaces.cs
- SspiNegotiationTokenProviderState.cs
- EdmSchemaAttribute.cs
- SqlDataSourceQueryEditor.cs
- odbcmetadatacolumnnames.cs
- PassportPrincipal.cs
- InternalBase.cs
- IFormattable.cs
- MetadataWorkspace.cs
- KeyConstraint.cs
- WindowProviderWrapper.cs
- SetStateEventArgs.cs
- FixedPosition.cs
- SqlClientPermission.cs
- RequestCacheManager.cs
- BaseDataList.cs
- QilNode.cs
- BitmapPalettes.cs
- PlainXmlDeserializer.cs
- DropDownButton.cs
- Util.cs
- SplineKeyFrames.cs
- Cursors.cs
- XmlSchemaAppInfo.cs
- ProviderBase.cs
- TextBoxAutoCompleteSourceConverter.cs
- PolicyValidator.cs
- BinaryObjectReader.cs
- IUnknownConstantAttribute.cs
- DBSchemaTable.cs
- RequestCache.cs
- BindingObserver.cs
- InputLanguageProfileNotifySink.cs
- ConfigurationLocationCollection.cs
- LinqDataSourceDeleteEventArgs.cs
- VectorAnimation.cs
- RootBrowserWindowProxy.cs
- BamlResourceContent.cs
- SizeAnimationUsingKeyFrames.cs
- NameObjectCollectionBase.cs
- DocumentReference.cs
- AuthenticationModuleElementCollection.cs
- WsdlServiceChannelBuilder.cs
- ProgressPage.cs
- UnauthorizedWebPart.cs
- ConfigurationSectionCollection.cs
- IgnoreDeviceFilterElementCollection.cs
- AmbientProperties.cs
- TimeStampChecker.cs
- GlyphRunDrawing.cs
- CommandLibraryHelper.cs
- MouseActionValueSerializer.cs
- DataGridViewSelectedRowCollection.cs
- AutoGeneratedField.cs
- TabRenderer.cs
- ReachObjectContext.cs
- InputScopeAttribute.cs
- mactripleDES.cs
- assemblycache.cs
- User.cs
- Function.cs
- SerializationInfoEnumerator.cs
- PolyBezierSegment.cs
- ReturnEventArgs.cs
- CallbackCorrelationInitializer.cs
- Calendar.cs
- ViewGenResults.cs
- PropertyTab.cs
- PermissionAttributes.cs
- StrongNameKeyPair.cs
- FileVersion.cs
- CodeExporter.cs
- Action.cs
- mda.cs
- CorrelationManager.cs
- XhtmlTextWriter.cs
- PolyLineSegment.cs
- _CommandStream.cs
- followingquery.cs
- ExpressionBindingCollection.cs
- QilFunction.cs
- ProcessThreadDesigner.cs
- HttpListenerRequestUriBuilder.cs
- BatchStream.cs
- CellPartitioner.cs
- AsyncCompletedEventArgs.cs