From a0f8590f9cba7bdde5d9b661a7b836e124da99e9 Mon Sep 17 00:00:00 2001
From: Antony Male <antony.male@gmail.com>
Date: Thu, 1 May 2014 17:45:34 +0100
Subject: [PATCH] Add LambdaComparer

---
 Stylet/LambdaComparer.cs | 36 ++++++++++++++++++++++++++++++++++++
 Stylet/Stylet.csproj     |  4 +++-
 2 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 Stylet/LambdaComparer.cs

diff --git a/Stylet/LambdaComparer.cs b/Stylet/LambdaComparer.cs
new file mode 100644
index 0000000..83bda6b
--- /dev/null
+++ b/Stylet/LambdaComparer.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Stylet
+{
+    /// <summary>
+    /// IEqualityComparer{T} implementation which uses a Lambda
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class LambdaComparer<T> : IEqualityComparer<T>
+    {
+        Func<T, T, bool> comparer;
+
+        /// <summary>
+        /// Create a new LambdaComparer{T}
+        /// </summary>
+        /// <param name="comparer">Comparer, which takes two {T} instances and returns true if they are equal</param>
+        public LambdaComparer(Func<T, T, bool> comparer)
+        {
+            this.comparer = comparer;
+        }
+
+        public bool Equals(T x, T y)
+        {
+            return this.comparer(x, y);
+        }
+
+        public int GetHashCode(T obj)
+        {
+            return obj.GetHashCode();
+        }
+    }
+}
diff --git a/Stylet/Stylet.csproj b/Stylet/Stylet.csproj
index a3355a6..b086f89 100644
--- a/Stylet/Stylet.csproj
+++ b/Stylet/Stylet.csproj
@@ -48,7 +48,9 @@
     <Compile Include="IValidationAdapter.cs" />
     <Compile Include="LabelledValue.cs" />
     <Compile Include="INotifyPropertyChangedDispatcher.cs" />
-    <Compile Include="LambdaComparer.cs" />
+    <Compile Include="LambdaComparer.cs">
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Include="StyletConductorExtensions.cs" />
     <Compile Include="ValidatingModelBase.cs" />
     <Compile Include="WeakEventManager.cs" />