n><span class="special">,</span> <span class="identifier">Compare</span><span class="special">,</span> <span class="identifier">Interval</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> <span class="special">&amp;</span> src<span class="special">)</span><span class="special">;</span></pre>Copy constructor for base_type. </li>
<li>
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id679379-bb"></a><span class="identifier">spl