span class=identifier>X</span><span class=special>::</span><span class=identifier>f</span><span class=special>;

</span></pre></code>

<p>

Then...</p>

<code><pre>

    <span class=special>.</span><span class=identifier>def</span><span class=special>(</span><span class=string>&quot;f&quot;</span><span class=special>, </span><span class=identifier>fx1</span><span class=special>, </span><span class=identifier>xf_overloads</span><span class=special>());

    .</span><span class=identifier>def</span><spa