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<div class="section" id="extensible-associative">
<h1><a class="toc-backref" href="./concepts.html#id331" name="extensible-associative">Extensible Associative Sequence</a></h1>
<div class="section" id="concepts-extensible-description">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>An <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> is an <a class="reference" href="./associative-sequence.html">Associative Sequence</a> that supports 
insertion and removal of elements. In contrast to <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>, 
<a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> does not provide a mechanism for 
inserting an element at a specific position.</p>
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<div class="section" id="concepts-extensible-expression-requirements">
<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">s</span></tt> is an <a class="reference" href="./associative-sequence.html">Associative Sequence</a>, 
<tt class="literal"><span class="pre">pos</span></tt> is an iterator into <tt class="literal"><span class="pre">s</span></tt>, and <tt class="literal"><span class="pre">x</span></tt> and <tt class="literal"><span class="pre">k</span></tt> are arbitrary types.</p>
<p>In addition to the <a class="reference" href="./associative-sequence.html">Associative Sequence</a> requirements, the following must be met:</p>
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<tr><th>Expression</th>
<th>Type</th>
<th>Complexity</th>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt></td>
<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
<td>Amortized constant time</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,pos,x&gt;::type</span></tt></td>
<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
<td>Amortized constant time</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,k&gt;::type</span></tt></td>
<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
<td>Amortized constant time</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos&gt;::type</span></tt></td>
<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
<td>Amortized constant time</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type</span></tt></td>
<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
<td>Amortized constant time</td>
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<div class="section" id="concepts-extensible-expression-semantics">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>The semantics of an expression are defined only
where they differ from, or are not defined in <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</p>
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<tr><th>Expression</th>
<th>Semantics</th>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt></td>
<td><p class="first">Inserts <tt class="literal"><span class="pre">x</span></tt> into <tt class="literal"><span class="pre">s</span></tt>; the resulting sequence <tt class="literal"><span class="pre">r</span></tt> is
equivalent to <tt class="literal"><span class="pre">s</span></tt> except that</p>
<pre class="literal-block">
<a href="./at.html" class="identifier">at</a>&lt; r, <a href="./key-type.html" class="identifier">key_type</a>&lt;s,x&gt;::type &gt;::type
</pre>
<p class="last">is identical to <tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a>&lt;s,x&gt;::type</span></tt>; see <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>.</p>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,pos,x&gt;::type</span></tt></td>
<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt>; <tt class="literal"><span class="pre">pos</span></tt> is ignored;
see <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>.</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,k&gt;::type</span></tt></td>
<td>Erases elements in <tt class="literal"><span class="pre">s</span></tt> associated with the key <tt class="literal"><span class="pre">k</span></tt>;
the resulting sequence <tt class="literal"><span class="pre">r</span></tt> is equivalent to <tt class="literal"><span class="pre">s</span></tt> except
that <tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a>&lt;r,k&gt;::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>; see <a class="refentry reference" href="./erase-key.html"><tt class="refentry literal"><span class="pre">erase_key</span></tt></a>.</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos&gt;::type</span></tt></td>
<td>Erases the element at a specific position; equivalent to
<tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;pos&gt;::type</span> <span class="pre">&gt;::type</span></tt>; see <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>.</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type</span></tt></td>
<td>An empty sequence concept-identical to <tt class="literal"><span class="pre">s</span></tt>; see
<a class="refentry reference" href="./clear.html"><tt class="refentry literal"><span class="pre">clear</span></tt></a>.</td>
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For any extensible associative sequence ``s`` the following invariants always hold:  -->
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<div class="section" id="concepts-extensible-models">
<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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<li><a class="refentry reference" href="./set.html"><tt class="refentry literal"><span class="pre">set</span></tt></a></li>
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<div class="section" id="concepts-extensible-see-also">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./associative-sequence.html">Associative Sequence</a>, <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>, <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>, <a class="refentry reference" href="./clear.html"><tt class="refentry literal"><span class="pre">clear</span></tt></a></p>
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