Since now the native pointer of the wrapper class can be of a base class, we need to explicitly cast to the current type.

src/Generator/Generators/CLI/CLIMarshal.cs

@@ -433,10 +433,12 @@ namespace Cxxi.Generators.CLI
                 && method.Conversion == MethodConversionKind.FunctionToInstanceMethod
                 && Context.ParameterIndex == 0)
             {
+                Return.Write("(::{0}*)", @class.QualifiedOriginalName);
                 Return.Write("NativePtr");
                 return;
             }
 
+            Return.Write("(::{0}*)", @class.QualifiedOriginalName);
             Return.Write("{0}->NativePtr", Context.Parameter.Name);
         }
 

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -312,7 +312,14 @@ namespace Cxxi.Generators.CLI
             }
             else
             {
-                Write(IsInstanceFunction(function) ? "NativePtr->" : "::");
+                if (IsInstanceFunction(function))
+                {
+                    Write("((::{0}*)NativePtr)->", @class.QualifiedOriginalName);
+                }
+                else
+                {
+                    Write("::");
+                }
 
                 Write("{0}(", function.QualifiedOriginalName);
                 GenerateFunctionParams(function, @params);