nk" href="algorithm.html#fusion.algorithm.sequence_extension">Sequence
      Extension</a>
    </h4>
<p>
      The <span class="emphasis"><em>lazy</em></span> evaluation scheme where <a class="link" href="algorithm.html" title="Algorithm">Algorithms</a>
      return <a class="link" href="view.html" title="View">Views</a> also allows operations such
      as <a class="link" href="algorithm/transformation/functions/push_back.html" title="push_back"><code class="computeroutput"><span class="identifier">push_ba