::policies, made available,
      for example, a by namespace declaration using <code class="computeroutput"><span class="keyword">namespace</span>
      <span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">;</span></code> or individual using declarations <code class="computeroutput"><span class="keyword">using</span> <span class="identifier">boost</span><span class