tifier">gregorian</span><span class="special">;</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">icl</span><span class="special">;</span>


<span class="comment">// Function weekends returns the interval_set of weekends that are contained in
</span><span class="comment">// the date interval 'scope'
</span><span class="identifier">interval_set</span><span class="special">&lt;</span><sp