class="identifier">unit_type</span><span class="special">;</span> 
  <span class="keyword">typedef</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">unit_type</span><span class="special">,</span> <span class="identifier">value_type</span> <span class="special">&gt;</span> <a name="boost.units.add_t_1_3_44_10_2_36_1_1_4.type"></a><span class="identifier">type</span><span class="special">;</span>      
<span class