6f63e9d0c6
[SVN r64705]
143 lines
9.6 KiB
HTML
143 lines
9.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: advance</title>
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<link rel="stylesheet" href="../style.css" type="text/css" />
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</head>
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<body class="docframe refmanual">
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Prev</a> <a href="./distance.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./distance.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./iterators.html" class="navigation-link">Iterators</a> / <a href="./iterator-metafunctions.html" class="navigation-link">Iterator Metafunctions</a> / <a href="./advance.html" class="navigation-link">advance</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="advance">
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<h1><a class="toc-backref" href="./iterator-metafunctions.html#id1454">advance</a></h1>
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<div class="section" id="id403">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename Iterator
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, typename N
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>
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struct <a href="./advance.html" class="identifier">advance</a>
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{
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typedef <em>unspecified</em> type;
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};
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</pre>
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</div>
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<div class="section" id="id404">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Moves <tt class="literal"><span class="pre">Iterator</span></tt> by the distance <tt class="literal"><span class="pre">N</span></tt>. For <a class="reference internal" href="./bidirectional-iterator.html">bidirectional</a> and
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<a class="reference internal" href="./random-access-iterator.html">random access</a> iterators, the distance may be negative.</p>
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</div>
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<div class="section" id="id405">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/advance.hpp" class="header">boost/mpl/advance.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id406">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="19%" />
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<col width="35%" />
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<col width="45%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">Iterator</span></tt></td>
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<td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td>
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<td>An iterator to advance.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">N</span></tt></td>
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<td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
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<td>A distance.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id407">
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<h3><a class="subsection-title" href="#model-of" name="model-of">Model Of</a></h3>
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<p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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</div>
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<div class="section" id="id408">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>For a <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a> <tt class="literal"><span class="pre">iter</span></tt> and arbitrary <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">n</span></tt>:</p>
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<pre class="literal-block">
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typedef <a href="./advance.html" class="identifier">advance</a><iter,n>::type j;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>.</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first">If <tt class="literal"><span class="pre">Iterator</span></tt> is a <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>, <tt class="literal"><span class="pre">n::value</span></tt> must be nonnegative.</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to:</p>
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<pre class="literal-block">
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typedef iter i0;
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typedef <a href="./next.html" class="identifier">next</a><i0>::type i1;
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<em>...</em>
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typedef <a href="./next.html" class="identifier">next</a><i<em>n-1</em>>::type j;
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</pre>
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<p>if <tt class="literal"><span class="pre">n::value</span> <span class="pre">></span> <span class="pre">0</span></tt>, and</p>
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<pre class="literal-block">
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typedef iter i0;
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typedef <a href="./prior.html" class="identifier">prior</a><i0>::type i1;
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<em>...</em>
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typedef <a href="./prior.html" class="identifier">prior</a><i<em>n-1</em>>::type j;
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</pre>
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<p>otherwise.</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre">j</span></tt> is dereferenceable or past-the-end;
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<tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><iter,j>::value</span> <span class="pre">==</span> <span class="pre">n::value</span></tt> if <tt class="literal"><span class="pre">n::value</span> <span class="pre">></span> <span class="pre">0</span></tt>, and
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<tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><j,iter>::value</span> <span class="pre">==</span> <span class="pre">n::value</span></tt> otherwise.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id409">
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
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<p>Amortized constant time if <tt class="literal"><span class="pre">iter</span></tt> is a model of
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<a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>, otherwise linear time.</p>
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</div>
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<div class="section" id="id410">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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typedef <a href="./range-c.html" class="identifier">range_c</a><int,0,10> numbers;
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typedef <a href="./begin.html" class="identifier">begin</a><numbers>::type first;
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typedef <a href="./end.html" class="identifier">end</a><numbers>::type last;
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typedef <a href="./advance.html" class="identifier">advance</a><first,<a href="./int.html" class="identifier">int_</a><10> >::type i1;
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typedef <a href="./advance.html" class="identifier">advance</a><last,<a href="./int.html" class="identifier">int_</a><-10> >::type i2;
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( boost::is_same<i1,last> ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( boost::is_same<i2,first> ));
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</pre>
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</div>
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<div class="section" id="id411">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a>, <a class="reference internal" href="./distance.html">distance</a>, <a class="reference internal" href="./next.html">next</a></p>
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<!-- Iterators/Iterator Metafunctions//distance |20 -->
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</div>
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<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Prev</a> <a href="./distance.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./distance.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
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