>

</div>

  </dl>
</div>
<div class="section" id="18">
  <h1><a class="toc-backref" href="#18">Templates</a></h1>
  <dl class="item">
    <div id="once-templates-all">
  <div id="once.t,Once,untyped">
  <dt><pre><span class="Keyword">template</span> <a href="#once.t%2COnce%2Cuntyped"><span class="Identifier">once</span></a><span class="Other">(</span><span class="Identifier">o</span><span class="Other">:</span> <a href="once.html#Once"><span class="Identifier">Once</span></a><span class="Other">;</span> <s