 <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span>                                                           <a name="boost.array.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span>       

  <span class="comment">// static constants</span>
  <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">size_type</span> <span class="i