Using classes in level 2 Matlab S-function

I am using level 2 Matlab S-function. Also I have a class that I define that calculates something. I want to have 2 instances of the same level 2 Matlab S-Function using the same class. But each instance of the S-Function should have it's different instance of the class. So in:

function InitializeConditions(block)
test = myClass(5);
%end InitializeConditions
and then in:

function Outputs(block)
test.increment();
block.OutputPort(1).Data = test.a;
%end Outputs

I need each class to have it's own instance. - Using global is not good because I will have only 1 instance of the class. - I cannot use DWork to store the class.

classdef myClass < handle
    properties
        a;
    end
    methods
        function obj = myClass(a)
            obj.a = a;
        end
        function increment(obj)
            obj.a = obj.a + 100;
        end
    end
end