Fixed the generated C# when a virtual function returns a primitive pointer.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -494,7 +494,8 @@ namespace CppSharp.Generators.CSharp
             if (!VisitType(pointer, quals))
                 return false;
 
-            if (Context.Function != null && pointer.IsPrimitiveTypeConvertibleToRef())
+            if (Context.Function != null && pointer.IsPrimitiveTypeConvertibleToRef() &&
+                Context.Kind != CSharpMarshalKind.VTableReturnValue)
             {
                 var refParamPtr = string.Format("__refParamPtr{0}", Context.ParameterIndex);
                 Context.SupportBefore.WriteLine("fixed ({0} {1} = &{2})",

tests/Common/Common.h

@@ -36,7 +36,7 @@ public:
     class NestedAbstract
     {
     public:
-        virtual void abstractFunctionInNestedClass() = 0;
+        virtual int* abstractFunctionInNestedClass() = 0;
     };
 
     Foo();