n><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></pre></li>
<li class="listitem"><pre class="literallayout">unit&amp; <a name="idp109873216-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="unit.html#boost.units.unit.this_type">this_type</a> <