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- <h1><a class="toc-backref" href="./concepts.html#id1396">Bidirectional Sequence</a></h1>
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- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>A <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a> is a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> whose iterators model
- <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>.</p>
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- <h3>Refinement of</h3>
- <p><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></p>
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- <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
- <p>In addition to the requirements defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>,
- for any <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p>
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- <tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td>
- <td><a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a></td>
- <td>Amortized constant time</td>
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- <tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td>
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- <td>Amortized constant time</td>
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- <tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a><s>::type</span></tt></td>
- <td>Any type</td>
- <td>Amortized constant time</td>
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- <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="./forward-sequence.html">Forward Sequence</a>.</p>
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- <tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a><s>::type</span></tt></td>
- <td>The last element in the sequence; see <a class="reference internal" href="./back.html">back</a>.</td>
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- <h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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- <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="./forward-sequence.html">Forward Sequence</a>, <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>, <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, <a class="reference internal" href="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./back.html">back</a></p>
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