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- <div class="section" id="extensible-associative-sequence">
- <h1><a class="toc-backref" href="./concepts.html#id1402">Extensible Associative Sequence</a></h1>
- <div class="section" id="id35">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>An <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> is an <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a> that supports
- insertion and removal of elements. In contrast to <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>,
- <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> does not provide a mechanism for
- inserting an element at a specific position.</p>
- </div>
- <div class="section" id="id36">
- <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 internal" 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 internal" href="./associative-sequence.html">Associative Sequence</a> requirements, the following must be met:</p>
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- <colgroup>
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- <col width="40%" />
- <col width="28%" />
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- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Type</th>
- <th class="head">Complexity</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt></td>
- <td><a class="reference internal" href="./extensible-associative-sequence.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><s,pos,x>::type</span></tt></td>
- <td><a class="reference internal" href="./extensible-associative-sequence.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><s,k>::type</span></tt></td>
- <td><a class="reference internal" href="./extensible-associative-sequence.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><s,pos>::type</span></tt></td>
- <td><a class="reference internal" href="./extensible-associative-sequence.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><s>::type</span></tt></td>
- <td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
- <td>Amortized constant time</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id37">
- <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 internal" href="./associative-sequence.html">Associative Sequence</a>.</p>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="32%" />
- <col width="68%" />
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- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Semantics</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::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>< r, <a href="./key-type.html" class="identifier">key_type</a><s,x>::type >::type
- </pre>
- <p class="last">is identical to <tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a><s,x>::type</span></tt>; see <a class="reference internal" href="./insert.html">insert</a>.</p>
- </td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,pos,x>::type</span></tt></td>
- <td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt>; <tt class="literal"><span class="pre">pos</span></tt> is ignored;
- see <a class="reference internal" href="./insert.html">insert</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a><s,k>::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><r,k>::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>; see <a class="reference internal" href="./erase-key.html">erase_key</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,pos>::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><s,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><pos>::type</span> <span class="pre">>::type</span></tt>; see <a class="reference internal" href="./erase.html">erase</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a><s>::type</span></tt></td>
- <td>An empty sequence concept-identical to <tt class="literal"><span class="pre">s</span></tt>; see
- <a class="reference internal" href="./clear.html">clear</a>.</td>
- </tr>
- </tbody>
- </table>
- <!-- Invariants
- - - - - - - - - - -
- For any extensible associative sequence ``s`` the following invariants always hold: -->
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- <div class="section" id="id39">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>, <a class="reference internal" href="./insert.html">insert</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./clear.html">clear</a></p>
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