| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Bidirectional Iterator</title> |
| <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.0"> |
| <link rel="up" href="../concepts.html" title="Concepts"> |
| <link rel="prev" href="forward_iterator.html" title="Forward Iterator"> |
| <link rel="next" href="random_access_iterator.html" title="Random Access Iterator"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> |
| <td align="center"><a href="../../../../../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../../../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="forward_iterator.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="random_access_iterator.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.description"></a><h6> |
| <a name="id846803"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.refinement_of"></a><h6> |
| <a name="id846921"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.expression_requirements"></a><h6> |
| <a name="id846945"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.meta_expressions"></a><h6> |
| <a name="id847235"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.expression_semantics"></a><h6> |
| <a name="id847337"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.invariants"></a><h6> |
| <a name="id847445"></a> |
| <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> |
| <a name="fusion.iterator.concepts.bidirectional_iterator.models"></a><h6> |
| <a name="id847680"></a> |
| <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/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 © 2001-2007 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> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="forward_iterator.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="random_access_iterator.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |