HashCode based on xxHash32

THIRD-PARTY-NOTICES.TXT

@@ -1,4 +1,4 @@
-.NET Core uses third-party libraries or other resources that may be
+.NET Core uses third-party libraries or other resources that may be
 distributed under licenses different than the .NET Core software.
 
 In the event that we accidentally failed to list a required notice, please
@@ -224,3 +224,31 @@ descriptions are © 1997-2005 Sean Eron Anderson. The code and descriptions are
 distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY and
 without even the implied warranty of merchantability or fitness for a particular
 purpose. 
+
+License notice for xxHash
+-------------------------
+
+xxHash Library
+Copyright (c) 2012-2014, Yann Collet
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice, this
+ list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/System.Runtime/ref/System.Runtime.cs

@@ -3675,6 +3675,51 @@ public void GetObjectData(System.Runtime.Serialization.SerializationInfo info, S
  public void SetTarget(T target) { }
  public bool TryGetTarget(out T target) { throw null; }
  }
+
+ public partial struct HashCode
+ {
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1>(T1 value1) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2>(T1 value1, T2 value2) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3>(T1 value1, T2 value2, T3 value3) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3, T4>(T1 value1, T2 value2, T3 value3, T4 value4) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3, T4, T5>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3, T4, T5, T6>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3, T4, T5, T6, T7>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6, T7 value7) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public static int Combine<T1, T2, T3, T4, T5, T6, T7, T8>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6, T7 value7, T8 value8) { throw null; }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public void Add<T>(T value) { }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public void Add<T>(T value, System.Collections.Generic.IEqualityComparer<T> comparer) { }
+
+ [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
+ public int ToHashCode() { throw null; }
+
+# pragma warning disable 0809
+
+ [System.ObsoleteAttribute("Use ToHashCode to retrieve the computed hash code.", error: true)]
+ [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+ public override int GetHashCode() { throw null; }
+
+# pragma warning restore 0809
+
+ }
 }
 
 namespace System.Runtime.ConstrainedExecution

src/System.Runtime/src/System.Runtime.csproj

@@ -18,6 +18,7 @@
  <Compile Include="System\Action.cs" />
  <Compile Include="System\Collections\Generic\ISet.cs" />
  <Compile Include="System\Function.cs" />
+ <Compile Include="System\HashCode.cs" />
  <Compile Include="System\IO\FileAttributes.cs" />
  <Compile Include="System\IO\HandleInheritability.cs" />
  <Compile Include="System\LazyOfTTMetadata.cs" />
@@ -33,4 +34,4 @@
  <ReferenceFromRuntime Include="System.Private.CoreLib" />
  </ItemGroup>
  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
+</Project>