Support for setting binary operations

PorygonSharpTests/UserDataTests.cs

@@ -27,6 +27,18 @@ namespace PorygonSharpTests
             {
                 return a + b;
             }
+            
+            public static UserDataTestObject operator + (UserDataTestObject a, UserDataTestObject b)
+            {
+                a.Foo += b.Foo;
+                return a;
+            }
+            
+            public static UserDataTestObject operator + (UserDataTestObject a, int b)
+            {
+                a.Foo += b;
+                return a;
+            }
         }
 
         [Test]
@@ -311,5 +323,53 @@ end
                 Assert.AreEqual(347807, result.EvaluateInteger());
             }
         }
+        
+        [Test]
+        public void CanUseBinaryOperations()
+        {
+            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
+            using (var script = new Script(@"
+function test(testObject a, testObject b)
+    return a + b
+end
+"))
+            {
+                var diags = script.Diagnostics.GetDiagnostics();
+                foreach (var diag in diags)
+                {
+                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
+                }
+
+                script.Evaluate();
+                var a = new UserDataTestObject();
+                var b = new UserDataTestObject();
+                var result = script.CallFunction("test", a, b);
+                Assert.AreEqual(400, ((UserDataTestObject)result.GetObjectValue()).Foo);
+            }
+        }
+
+        [Test]
+        public void CanUseBinaryOperationsWithScriptTypes()
+        {
+            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
+            using (var script = new Script(@"
+function test(testObject a)
+    return a + 500
+end
+"))
+            {
+                var diags = script.Diagnostics.GetDiagnostics();
+                foreach (var diag in diags)
+                {
+                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
+                }
+
+                script.Evaluate();
+                var a = new UserDataTestObject();
+                var result = script.CallFunction("test", a);
+                Assert.AreEqual(700, ((UserDataTestObject)result.GetObjectValue()).Foo);
+            }
+        }
+
     }
 }