Added param to interface pass for Operator functions and a test.

src/Generator/Passes/ParamTypeToInterfacePass.cs

@@ -1,4 +1,5 @@
-using CppSharp.AST;
+using System.Linq;
+using CppSharp.AST;
 using CppSharp.AST.Extensions;
 
 namespace CppSharp.Passes
@@ -7,20 +8,22 @@ namespace CppSharp.Passes
     {
         public override bool VisitFunctionDecl(Function function)
         {
-            if (!function.IsOperator)
-            {
-                ChangeToInterfaceType(function.ReturnType);
-                foreach (Parameter parameter in function.Parameters)
+            if (!function.IsOperator || function.Parameters.Count > 1)
+                ChangeToInterfaceType(function.OriginalReturnType);
+
+            if (function.OperatorKind != CXXOperatorKind.Conversion && 
+                function.OperatorKind != CXXOperatorKind.ExplicitConversion)
             {
+                foreach (var parameter in function.Parameters.Where(p => p.Kind != ParameterKind.OperatorParameter))
                     ChangeToInterfaceType(parameter.QualifiedType);
             }
-            }
+            
             return base.VisitFunctionDecl(function);
         }
 
         private static void ChangeToInterfaceType(QualifiedType type)
         {
-            var tagType = type.Type.GetFinalPointee() as TagType;
+            var tagType = (type.Type.GetFinalPointee() ?? type.Type) as TagType;
             if (tagType != null)
             {
                 var @class = tagType.Declaration as Class;

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -261,4 +261,20 @@ public class CSharpTempTests : GeneratorTestFixture
             }
         }
     }
+
+    [Test]
+    public void TestParamTypeToInterfacePass()
+    {
+        var baseClass = new TestParamToInterfacePassBaseTwo();
+        baseClass++;
+        Assert.AreEqual(baseClass.M, 1);
+        ITestParamToInterfacePassBaseTwo baseInterface = new TestParamToInterfacePassBaseTwo();
+        var dervClass = new TestParamToInterfacePass();
+        dervClass.AddM(baseClass);
+        Assert.AreEqual(dervClass.M, 1);
+        dervClass = new TestParamToInterfacePass(dervClass + baseClass);
+        Assert.AreEqual(dervClass.M, 2);
+        dervClass = new TestParamToInterfacePass(dervClass + baseInterface);
+        Assert.AreEqual(dervClass.M, 2);
+    }
 }

tests/CSharpTemp/CSharpTemp.cpp

@@ -507,3 +507,49 @@ void TestOverrideFromSecondaryBase::VirtualMember()
 void TestOverrideFromSecondaryBase::setProperty(int value)
 {
 }
+
+int TestParamToInterfacePassBaseTwo::getM()
+{
+	return m;
+}
+
+void TestParamToInterfacePassBaseTwo::setM(int n)
+{
+	m = n;
+}
+
+const TestParamToInterfacePassBaseTwo& TestParamToInterfacePassBaseTwo::operator++()
+{
+	++m;
+	return *this;
+}
+
+TestParamToInterfacePassBaseTwo::TestParamToInterfacePassBaseTwo()
+{
+	m = 0;
+}
+
+TestParamToInterfacePassBaseTwo::TestParamToInterfacePassBaseTwo(int n)
+{
+	m = n;
+}
+
+TestParamToInterfacePassBaseTwo TestParamToInterfacePass::addM(TestParamToInterfacePassBaseTwo b)
+{
+	this->setM(this->getM() + b.getM());
+	return *this;
+}
+
+TestParamToInterfacePassBaseTwo TestParamToInterfacePass::operator+(TestParamToInterfacePassBaseTwo b)
+{
+	return TestParamToInterfacePassBaseTwo(this->getM() + b.getM());
+}
+
+TestParamToInterfacePass::TestParamToInterfacePass(TestParamToInterfacePassBaseTwo b)
+{
+	this->setM(b.getM());
+}
+
+TestParamToInterfacePass::TestParamToInterfacePass() : TestParamToInterfacePassBaseOne(), TestParamToInterfacePassBaseTwo()
+{
+}

tests/CSharpTemp/CSharpTemp.h

@@ -509,3 +509,27 @@ public:
     void VirtualMember();
     void setProperty(int value);
 };
+
+class DLL_API TestParamToInterfacePassBaseOne
+{
+};
+
+class DLL_API TestParamToInterfacePassBaseTwo
+{
+	int m;
+public:
+	int getM();
+	void setM(int n);
+	const TestParamToInterfacePassBaseTwo& operator++();
+	TestParamToInterfacePassBaseTwo();
+	TestParamToInterfacePassBaseTwo(int n);
+};
+
+class DLL_API TestParamToInterfacePass : public TestParamToInterfacePassBaseOne, public TestParamToInterfacePassBaseTwo
+{
+public:
+	TestParamToInterfacePassBaseTwo addM(TestParamToInterfacePassBaseTwo b);
+	TestParamToInterfacePassBaseTwo operator+(TestParamToInterfacePassBaseTwo b);
+	TestParamToInterfacePass(TestParamToInterfacePassBaseTwo b);
+	TestParamToInterfacePass();
+};