ss="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date_duration</span> <span class="special">&amp;</span> x<span class="special">)</span><span class="special">;</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date_duration</span> 
    <a name="boost.icl.operator--_idm35615"></a><span class="keyword">operator</span