<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>advance</title> <link rel="stylesheet" href="../../../../../../../doc/html/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.1"> <link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../metafunctions.html" title="Metafunctions"> <link rel="prev" href="distance.html" title="distance"> <link rel="next" href="advance_c.html" title="advance_c"> </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="../../../../../../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="distance.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="advance_c.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="section" title="advance"> <div class="titlepage"><div><div><h4 class="title"> <a name="fusion.iterator.metafunctions.advance"></a><a class="link" href="advance.html" title="advance">advance</a> </h4></div></div></div> <a name="fusion.iterator.metafunctions.advance.description"></a><h6> <a name="id641967"></a> <a class="link" href="advance.html#fusion.iterator.metafunctions.advance.description">Description</a> </h6> <p> Moves an iterator a specified distance. </p> <a name="fusion.iterator.metafunctions.advance.synopsis"></a><h6> <a name="id641985"></a> <a class="link" href="advance.html#fusion.iterator.metafunctions.advance.synopsis">Synopsis</a> </h6> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">M</span> <span class="special">></span> <span class="keyword">struct</span> <span class="identifier">advance</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span> </pre> <div class="table"> <a name="id642070"></a><p class="title"><b>Table 1.18. Parameters</b></p> <div class="table-contents"><table class="table" summary="Parameters"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Parameter </p> </th> <th> <p> Requirement </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><span class="identifier">I</span></code> </p> </td> <td> <p> Model of <a class="link" href="../concepts/forward_iterator.html" title="Forward Iterator">Forward Iterator</a> </p> </td> <td> <p> Iterator to move relative to </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">M</span></code> </p> </td> <td> <p> Model of <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL Integral Constant</a> </p> </td> <td> <p> Number of positions to move </p> </td> </tr> </tbody> </table></div> </div> <br class="table-break"><a name="fusion.iterator.metafunctions.advance.expression_semantics"></a><h6> <a name="id642191"></a> <a class="link" href="advance.html#fusion.iterator.metafunctions.advance.expression_semantics">Expression Semantics</a> </h6> <pre class="programlisting"><a class="link" href="advance.html" title="advance"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">M</span><span class="special">>::</span><span class="identifier">type</span> </pre> <p> <span class="bold"><strong>Return type</strong></span>: A model of the same iterator concept as <code class="computeroutput"><span class="identifier">I</span></code>. </p> <p> <span class="bold"><strong>Semantics</strong></span>: Returns an iterator a distance <code class="computeroutput"><span class="identifier">M</span></code> from <code class="computeroutput"><span class="identifier">I</span></code>. If <code class="computeroutput"><span class="identifier">I</span></code> is a <a class="link" href="../concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional Iterator</a> then <code class="computeroutput"><span class="identifier">M</span></code> may be negative. </p> <a name="fusion.iterator.metafunctions.advance.header"></a><h6> <a name="id642306"></a> <a class="link" href="advance.html#fusion.iterator.metafunctions.advance.header">Header</a> </h6> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <a name="fusion.iterator.metafunctions.advance.example"></a><h6> <a name="id642414"></a> <a class="link" href="advance.html#fusion.iterator.metafunctions.advance.example">Example</a> </h6> <pre class="programlisting"><span class="keyword">typedef</span> <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">vec</span><span class="special">;</span> <span class="keyword">typedef</span> <a class="link" href="../../sequence/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">vec</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span> <span class="keyword">typedef</span> <a class="link" href="next.html" title="next"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></code></a><span class="special"><</span><span class="identifier">first</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span> <span class="keyword">typedef</span> <a class="link" href="next.html" title="next"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></code></a><span class="special"><</span><span class="identifier">second</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span> <span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a class="link" href="equal_to.html" title="equal_to"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></code></a><span class="special"><</span><a class="link" href="advance.html" title="advance"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></code></a><span class="special"><</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special"><</span><span class="number">2</span><span class="special">></span> <span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">third</span><span class="special">>));</span> </pre> </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="distance.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="advance_c.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>