lass template unit">unit</a><span class="special">&lt;</span> <span class="identifier">Dim</span><span class="special">,</span> <span class="identifier">System</span> <span class="special">&gt;</span> <a name="boost.units.unit.this_type"></a><span class="identifier">this_type</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">Dim</span>                 <a name="boost.units.unit.dimension_type"></a><span class="identifier">dimension_type</span><span clas