</span> <a class="link" href="signal/arg.html" title="Class template arg">arg</a> <span class="special">{</span>
  <span class="keyword">public</span><span class="special">:</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="identifier">Tn</span> <a class="link" href="signal/arg.html#boost.signals2.signal.arg.type"><span class="identifier">type</span></a><span class="special">;</span>  <span class="comment">// The type of the <a class="link" href="signal.h