 also be bound much like member functions. Member variables
          are not functions. Yet, like the <a class="link" href="../core/references.html" title="References"><code class="computeroutput"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code></a>
          that acts like a nullary function returning a reference to the data, member
          variables, when bound, act like a unary function, taking in a pointer or
     