lculate the next Fibonacci
        number. Because <span class="emphasis"><em>asymmetric_coroutine&lt;&gt;::pull_type</em></span>
        provides input iterators and <span class="emphasis"><em>std::begin()</em></span>/<span class="emphasis"><em>std::end()</em></span>
        are overloaded, a <span class="emphasis"><em>range-based for</em></span>-loop can be used to
        iterate over the generated Fibonacci numbers.
      </p>
<h5>
<a name="coroutine.coroutine.asymmetric.h1"></a>
        <span class="ph