    construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="idp41690400-bb"></a><span class="identifier">year_month_day_base</span><span class="special">(</span><span class="identifier">YearType</span> year<span class="special">,</span> <span class="identifier">MonthType</span> month<span class="special">,</span> <span class="identifier">DayType</span> day<span class="special">)</span><span class="special">;</span></pre