 class="identifier">math</span><span class="special">::</span><span class="identifier">acosh</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> in their
        code.
      </p>
<p>
        However, for large scale software development where compile times are significant,
        and where the Boost libraries are already built and installed on the system,
        then including <code class="computeroutput"><span class="special">&lt;</span><span class="