</span> <span class="identifier">depends</span> <span class="identifier">on</span> <span class="identifier">whether</span> <span class="identifier">or</span> <span class="identifier">not</span> <span class="identifier">the</span> <span class="identifier">optional</span> <span class="identifier">BOOST_TTI_TP_U</span> <span class="identifier">is</span> <span class="identifier">specified</span><span class="special">.</span>
  
            <span class="identifier">If</span> <span class="identifier">BOOST_TTI_TP