</span><span class="special">;</span>
  <a class="link" href="unit.html#idp109872592-bb"><span class="identifier">unit</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="unit.html#boost.units.unit.this_type">this_type</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  unit&amp; <a class="link" href="unit.html#idp109873216-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="spec