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133 lines
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<title>The MPL Reference Manual: Extensible Associative Sequence</title>
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./associative-sequence.html" class="navigation-link">Prev</a> <a href="./integral-sequence-wrapper.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./associative-sequence.html" class="navigation-link">Back</a> <a href="./integral-sequence-wrapper.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./concepts.html" class="navigation-link">Concepts</a> / <a href="./extensible-associative-sequence.html" class="navigation-link">Extensible Associative Sequence</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="extensible-associative-sequence">
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<h1><a class="toc-backref" href="./concepts.html#id1402">Extensible Associative Sequence</a></h1>
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<div class="section" id="id35">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<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
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insertion and removal of elements. In contrast to <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>,
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<a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> does not provide a mechanism for
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inserting an element at a specific position.</p>
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</div>
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<div class="section" id="id36">
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<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
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<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>,
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<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>
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<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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<table border="1" class="docutils table">
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<col width="40%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Expression</th>
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<th class="head">Type</th>
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<th class="head">Complexity</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,pos,x>::type</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a><s,k>::type</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,pos>::type</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a><s>::type</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id37">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>The semantics of an expression are defined only
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where they differ from, or are not defined in <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</p>
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<table border="1" class="docutils table">
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<thead valign="bottom">
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<tr><th class="head">Expression</th>
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<th class="head">Semantics</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt></td>
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<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
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equivalent to <tt class="literal"><span class="pre">s</span></tt> except that</p>
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<pre class="literal-block">
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<a href="./at.html" class="identifier">at</a>< r, <a href="./key-type.html" class="identifier">key_type</a><s,x>::type >::type
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</pre>
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<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>
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</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,pos,x>::type</span></tt></td>
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<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;
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see <a class="reference internal" href="./insert.html">insert</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a><s,k>::type</span></tt></td>
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<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>;
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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
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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>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,pos>::type</span></tt></td>
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<td>Erases the element at a specific position; equivalent to
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<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>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a><s>::type</span></tt></td>
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<td>An empty sequence concept-identical to <tt class="literal"><span class="pre">s</span></tt>; see
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<a class="reference internal" href="./clear.html">clear</a>.</td>
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</tr>
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</tbody>
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</table>
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<!-- Invariants
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- - - - - - - - - -
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For any extensible associative sequence ``s`` the following invariants always hold: -->
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</div>
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<div class="section" id="id38">
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<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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<ul class="simple">
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<li><a class="reference internal" href="./set.html">set</a></li>
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<li><a class="reference internal" href="./map.html">map</a></li>
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</ul>
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<!-- * |multiset| -->
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</div>
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<div class="section" id="id39">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<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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<!-- Sequences/Concepts//Integral Sequence Wrapper |90 -->
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
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