y">How
        to write a functor for use with the <code class="computeroutput"><span class="identifier">functor_input</span></code>
        InputPolicy</a>
      </h5>
<p>
        If you want to use the <code class="computeroutput"><span class="identifier">functor_input</span></code>
        InputPolicy, you can write your own function object that will supply the
        input to <code class="computeroutput"><span class="identifier">multi_pass</span></code>. The
        function object must satisfy several