An Extensible Sequence is either a <ahref="./Forward_Sequence.html">Forward Sequence</a>, a <ahref="./Bidirectional_Sequence.html">Bidirectional Sequence</a> or a <ahref="./Random_Access_Sequence.html">Random Access Sequence</a> that supports insertion and removal operations.
<p>
<h3>Refinement of</h3>
<p>
<ahref="./Forward_Sequence.html">Forward Sequence</a>, <ahref="./Bidirectional_Sequence.html">Bidirectional Sequence</a> or <ahref="./Random_Access_Sequence.html">Random Access Sequence</a>
<p>
<h3>Valid expressions</h3>
<p>
<tableborder="1">
<tr><th> Expression </th><th> Expression type </th></tr>
<tr><td><code>typename clear<s>::type</code></td><td>A model of concept of <code>s</code></td></tr>
<tr><td><code>typename insert<s,pos,T>::type</code></td><td>A model of concept of <code>s</code></td></tr>
<tr><td><code>typename erase<s,pos>::type</code></td><td>A model of concept of <code>s</code></td></tr>
<tr><td><code>typename erase<s,first,last>::type</code></td><td>A model of concept of <code>s</code></td></tr>
</table>
<p>
<h3>Expression semantics</h3>
<p>
See the description of <ahref="./Reference/clear.html">clear</a>, <ahref="./Reference/insert.html">insert</a>, and <ahref="./Reference/erase.html">erase</a> algorithms.