der policies</a>
      </h5>
      <p>
        The rounder policies supplied by this header use math functions <code class="computeroutput"><span class="identifier">floor</span><span class="special">()</span></code>
        and <code class="computeroutput"><span class="identifier">ceil</span><span class="special">()</span></code>.
        The standard versions of these functions are introduced in context by a using
        directive, so in normal conditions, the standard functions will be used.
      </p>
 