ass="special">&lt;</span><span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="../../../boost/icl/difference_type_o_idm35522.html" title="Struct difference_type_of&lt;boost::gregorian::date&gt;">difference_type_of</a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date</span><span class="special">&gt;</span><span class="sp