span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">T</span>                                                                        <a name="boost.array.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>            
  <span class="keyword">typedef</span> <span class="identifier">T</span><span class="special">*</span>                                                                       <a name="boost.array.iterator"></a><