I need to build a managed DLL in C++ and call it from C#.  I need this
to work with remoting as well.

In C#, class objects are reference types, so if an object is passed
directly to a C++ method it is considered a reference to the object.

C# call:
  i = some_method( some_object );

C++ method:
  int some_method( some_class ^ some_object)
  {
     int result;

     some_object->member1 = 123;
     result = some_object->member2 * 2;

     return result;
  }

This is fine until we need to run with remoting.  For C# to marshal the
class object in both directions (so the function can change members of
the object and pass the new value back), then in C# we must use a "ref"
call:
  i = some_method( ref some_object );

How should the C++ method be written to accept this call?

Thanks - any suggestions are appreciated.