Call non-static class functions from mex

Hi,

I have some Matlab OOP Code:

classdef foo
   properties
      a;
   end
   methods
      function obj = fun(obj)
         a = a + 1; % you get the idea
      end
   end
end

I am rewriting some functions that access this class in MEX/C. Somewhere in this code, which I am rewriting, there is the line:

someFooInstance = someFooInstance.fun;

My question now is: Is there a way to call the function fun out of my C-code? I know about the function mexCallMATLAB - but I am unsure whether and how to use this function with non-static member functions. Any advice would be great.

Note: Simple rewriting this member function fun is not an option in this case