span class="keyword">typedef</span> <span class="identifier">base_maker</span><span class="special">::</span><span class="identifier">compare_argument</span>    <a name="boost.heap.skew_heap.implementation_defined.value_compare"></a><span class="identifier">value_compare</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <span class="identifier">base_maker</span><span class="special">::</span><span class="identifier">allocator_type</span>      <a name="boost.heap.skew_heap.imp