the buffer
        to the <code class="computeroutput"><span class="identifier">fixed_size_queue</span></code> policy.
        While the default multi_pass configuration is designed for safety, <code class="computeroutput"><span class="identifier">look_ahead</span></code> is designed for speed. <code class="computeroutput"><span class="identifier">look_ahead</span></code> is derived from a multi_pass
        with the following policies: <code class="computeroutput"><span class="identifier">input_iterator</s