title: Assignment to a superclass
body: <p>How does one go about assigning to an object's superclass? </p>
  
  <p>Example: </p>
  
  <pre><code>classdef foo &lt; bar
  ...
    methods
      function this = barSet(this,b)
        % Here I want to arrange that bar(this) == b
      end
    end
  end
  </code></pre>
  
  <p>How (or can) I implement <code>barSet</code>?</p>