Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/mscorlib/system/icomparable.cs

@@ -0,0 +1,40 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+namespace System {
+    
+    using System;
+    // The IComparable interface is implemented by classes that support an
+    // ordering of instances of the class. The ordering represented by
+    // IComparable can be used to sort arrays and collections of objects
+    // that implement the interface.
+    // 
+[System.Runtime.InteropServices.ComVisible(true)]
+    public interface IComparable
+    {
+    // Interface does not need to be marked with the serializable attribute
+        // Compares this object to another object, returning an integer that
+        // indicates the relationship. An implementation of this method must return
+        // a value less than zero if this is less than object, zero
+        // if this is equal to object, or a value greater than zero
+        // if this is greater than object.
+        // 
+        int CompareTo(Object obj);
+    }
+
+    // Generic version of IComparable.
+
+    public interface IComparable<in T>
+    {
+        // Interface does not need to be marked with the serializable attribute
+        // Compares this object to another object, returning an integer that
+        // indicates the relationship. An implementation of this method must return
+        // a value less than zero if this is less than object, zero
+        // if this is equal to object, or a value greater than zero
+        // if this is greater than object.
+        // 
+        int CompareTo(T other);
+    }
+}