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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Bidirectional Iterator</title>
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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.concepts.bidirectional_iterator"></a><a class="link" href="bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</h4></div></div></div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h0"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.description"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.description">Description</a>
</h6>
<p>
A Bidirectional Iterator traverses a <a class="link" href="../../sequence.html" title="Sequence">Sequence</a>
allowing movement in either direction one element at a time.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">i</span></code></span></dt>
<dd><p>
A Bidirectional Iterator
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">I</span></code></span></dt>
<dd><p>
A Bidirectional Iterator type
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">M</span></code></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">N</span></code></span></dt>
<dd><p>
An integral constant
</p></dd>
</dl>
</div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h1"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.refinement_of"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.refinement_of">Refinement
of</a>
</h6>
<p>
<a class="link" href="forward_iterator.html" title="Forward Iterator">Forward Iterator</a>
</p>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h2"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.expression_requirements"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.expression_requirements">Expression
requirements</a>
</h6>
<p>
In addition to the requirements defined in <a class="link" href="forward_iterator.html" title="Forward Iterator">Forward
Iterator</a>, the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../functions/next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
<a class="link" href="bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
<a class="link" href="bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../functions/advance_c.html" title="advance_c"><code class="computeroutput"><span class="identifier">advance_c</span></code></a><span class="special"><</span><span class="identifier">N</span><span class="special">>(</span><span class="identifier">i</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
<a class="link" href="bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../functions/advance.html" title="advance"><code class="computeroutput"><span class="identifier">advance</span></code></a><span class="special"><</span><span class="identifier">M</span><span class="special">>(</span><span class="identifier">i</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
<a class="link" href="bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h3"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.meta_expressions"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.meta_expressions">Meta
Expressions</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../metafunctions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr></tbody>
</table></div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h4"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.expression_semantics"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.expression_semantics">Expression
Semantics</a>
</h6>
<p>
The semantics of an expression are defined only where they differ from,
or are not defined in <a class="link" href="forward_iterator.html" title="Forward Iterator">Forward
Iterator</a>
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
An iterator to the element preceding <code class="computeroutput"><span class="identifier">i</span></code>
</p>
</td>
</tr></tbody>
</table></div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h5"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.invariants"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.invariants">Invariants</a>
</h6>
<p>
In addition to the invariants of <a class="link" href="forward_iterator.html" title="Forward Iterator">Forward
Iterator</a>, the following invariants always hold:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<code class="computeroutput"><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><a class="link" href="../functions/next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span> <span class="identifier">i</span> <span class="special">&&</span>
<a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><a class="link" href="../functions/next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span> <a class="link" href="../functions/next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="../functions/advance_c.html" title="advance_c"><code class="computeroutput"><span class="identifier">advance_c</span></code></a><span class="special"><-</span><span class="number">1</span><span class="special">>(</span><span class="identifier">i</span><span class="special">)</span></code>
</li>
<li class="listitem">
Using <code class="computeroutput"><a class="link" href="../functions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a></code> to traverse a
sequence will never return a previously seen position
</li>
</ul></div>
<h6>
<a name="fusion.iterator.concepts.bidirectional_iterator.h6"></a>
<span><a name="fusion.iterator.concepts.bidirectional_iterator.models"></a></span><a class="link" href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.models">Models</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../../adapted/std__pair.html" title="std::pair"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code></a>
iterator
</li>
<li class="listitem">
<a class="link" href="../../adapted/boost__array.html" title="boost::array"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></code></a>
iterator
</li>
<li class="listitem">
<a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a>
iterator
</li>
<li class="listitem">
<a class="link" href="../../view/single_view.html" title="single_view"><code class="computeroutput"><span class="identifier">single_view</span></code></a>
iterator
</li>
<li class="listitem">
<a class="link" href="../../view/iterator_range.html" title="iterator_range"><code class="computeroutput"><span class="identifier">iterator_range</span></code></a>
(where adapted sequence is a <a class="link" href="../../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a>)
</li>
<li class="listitem">
<a class="link" href="../../view/transform_view.html" title="transform_view"><code class="computeroutput"><span class="identifier">transform_view</span></code></a>
(where adapted sequence is a <a class="link" href="../../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a>)
</li>
<li class="listitem">
<a class="link" href="../../view/reverse_view.html" title="reverse_view"><code class="computeroutput"><span class="identifier">reverse_view</span></code></a>
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman,
Dan Marsden, Tobias Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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