quence operations. Views are inherently lazy. Their
      elements are only computed on demand only when the elements of the underlying
      sequence(s) are actually accessed. Views' lazy nature make them very cheap
      to copy and be passed around by value.
    </p>
<h4>
<a name="fusion.view.h0"></a>
      <span class="phrase"><a name="fusion.view.header"></a></span><a class="link" href="view.html#fusion.view.header">Header</a>
    </h4>
<pre class="programlisting"><span class="preprocessor">#include</s