<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Bidirectional Sequence</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_sequence.html" title="Forward Sequence"> <link rel="next" href="random_access_sequence.html" title="Random Access Sequence"> </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 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</h4></div></div></div> <a name="fusion.sequence.concepts.bidirectional_sequence.description"></a><h6> <a name="id913079"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.description">Description</a> </h6> <p> A Bidirectional Sequence is a <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward Sequence</a> whose iterators model <a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional Iterator</a>. </p> <a name="fusion.sequence.concepts.bidirectional_sequence.refinement_of"></a><h6> <a name="id913111"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.refinement_of">Refinement of</a> </h6> <p> <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward Sequence</a> </p> <div class="variablelist"> <p class="title"><b>Notation</b></p> <dl> <dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt> <dd><p> A Forward Sequence </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">S</span></code></span></dt> <dd><p> A Forward Sequence type </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">o</span></code></span></dt> <dd><p> An arbitrary object </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">e</span></code></span></dt> <dd><p> A Sequence element </p></dd> </dl> </div> <a name="fusion.sequence.concepts.bidirectional_sequence.valid_expressions"></a><h6> <a name="id913219"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.valid_expressions">Valid Expressions</a> </h6> <p> In addition to the requirements defined in <a class="link" href="forward_sequence.html" title="Forward Sequence">Forward Sequence</a>, for any Bidirectional Sequence the following must be met: </p> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Expression </p> </th> <th> <p> Return type </p> </th> <th> <p> Type Requirements </p> </th> <th> <p> Runtime Complexity </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> </p> </td> <td> <p> <a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional Iterator</a> </p> </td> <td> </td> <td> <p> Constant </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/functions/end.html" title="end"><code class="computeroutput"><span class="identifier">end</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> </p> </td> <td> <p> <a class="link" href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional Iterator</a> </p> </td> <td> </td> <td> <p> Constant </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> </p> </td> <td> <p> Any type </p> </td> <td> </td> <td> <p> Constant </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span> <span class="special">=</span> <span class="identifier">o</span></code> </p> </td> <td> <p> Any type </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">s</span></code> is mutable and <code class="computeroutput"><span class="identifier">e</span> <span class="special">=</span> <span class="identifier">o</span></code>, where <code class="computeroutput"><span class="identifier">e</span></code> is the first element in the sequence, is a valid expression. </p> </td> <td> <p> Constant </p> </td> </tr> </tbody> </table></div> <a name="fusion.sequence.concepts.bidirectional_sequence.result_type_expressions"></a><h6> <a name="id913552"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.result_type_expressions">Result Type 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="../intrinsic/metafunctions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></code></a><span class="special"><</span><span class="identifier">S</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> Amortized constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/metafunctions/end.html" title="end"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></code></a><span class="special"><</span><span class="identifier">S</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> Amortized constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><a class="link" href="../intrinsic/metafunctions/back.html" title="back"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></code></a><span class="special"><</span><span class="identifier">S</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.sequence.concepts.bidirectional_sequence.expression_semantics"></a><h6> <a name="id913760"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.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_sequence.html" title="Forward Sequence">Forward Sequence</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="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> </p> </td> <td> <p> The last element in the sequence; see <a class="link" href="../intrinsic/functions/back.html" title="back"><code class="computeroutput"><span class="identifier">back</span></code></a>. </p> </td> </tr></tbody> </table></div> <a name="fusion.sequence.concepts.bidirectional_sequence.models"></a><h6> <a name="id913868"></a> <a class="link" href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.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> </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> </li> <li class="listitem"> <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></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> <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 Bidirectional Sequence) </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 Bidirectional Sequence) </li> <li class="listitem"> <a class="link" href="../../view/zip_view.html" title="zip_view"><code class="computeroutput"><span class="identifier">zip_view</span></code></a> (where adapted sequences are models of Bidirectional Sequence) </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_sequence.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_sequence.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>