Allows for overloaded functions in CSharp to be used, initial work on handling CSHarp operators

UpsilonTests/TableTests.cs

@@ -1,4 +1,3 @@
-using System;
 using Upsilon.Evaluator;
 using Xunit;
 

UpsilonTests/UserDataOperatorTests.cs

@@ -0,0 +1,63 @@
+using System;
+using Upsilon.BaseTypes.UserData;
+using Upsilon.Evaluator;
+using Xunit;
+// ReSharper disable UnusedMember.Local
+// ReSharper disable ClassNeverInstantiated.Global
+
+namespace UpsilonTests
+{
+    public class UserDataOperatorTests : IClassFixture<UserDataOperatorTests.UserDataOperatorTestsFixture>
+    {
+        public class UserDataOperatorTestsFixture : IDisposable
+        {
+            public UserDataOperatorTestsFixture()
+            {
+                UserDataTypeHandler.LoadType<UserDataHelper>();
+            }
+
+            public void Dispose()
+            {
+            }
+        }
+
+#pragma warning disable 414, 649
+        private class UserDataHelper
+        {
+            public UserDataHelper(double value)
+            {
+                Value = value;
+            }
+
+            public double Value { get; }
+
+            public static UserDataHelper operator +(UserDataHelper a, UserDataHelper b)
+            {
+                return new UserDataHelper(a.Value + b.Value);
+            }
+
+            public static UserDataHelper operator +(UserDataHelper a, double b)
+            {
+                return new UserDataHelper(a.Value + b);
+            }
+
+        }
+#pragma warning restore 414, 649
+
+
+        [Fact]
+        public void TestAddition()
+        {
+            const string input = @"
+function add(o1, o2)
+    return o1 + o2
+end
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            var o1 = new UserDataHelper(100);
+            var o2 = new UserDataHelper(215);
+            var result = script.EvaluateFunction("add", new[] {o1, o2});
+        }
+    }
+}