119 lines
7.9 KiB
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119 lines
7.9 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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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: prior</title>
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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="./next.html" class="navigation-link">Prev</a> <a href="./deref.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./next.html" class="navigation-link">Back</a> <a href="./deref.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="./prior.html" class="navigation-link">prior</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="prior">
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<h1><a class="toc-backref" href="./iterator-metafunctions.html#id1457">prior</a></h1>
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<div class="section" id="id429">
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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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>
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struct <a href="./prior.html" class="identifier">prior</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="id430">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Returns the previous iterator in the sequence. [<em>Note:</em> <tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a></span></tt> has a number of
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overloaded meanings, depending on the type of its argument. For instance,
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if <tt class="literal"><span class="pre">X</span></tt> is an <a class="reference internal" href="./integral-constant.html">Integral Constant</a>, <tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><X></span></tt> returns an decremented
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<a class="reference internal" href="./integral-constant.html">Integral Constant</a> of the same type. The following specification is
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iterator-specific. Please refer to the corresponding concept's
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documentation for the details of the alternative semantics — <em>end note</em>].</p>
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</div>
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<div class="section" id="id431">
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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/next_prior.hpp" class="header">boost/mpl/next_prior.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id432">
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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="./bidirectional-iterator.html">Bidirectional Iterator</a>.</td>
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<td>An iterator to decrement.</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="id433">
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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 any <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>s <tt class="literal"><span class="pre">iter</span></tt>:</p>
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<pre class="literal-block">
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typedef <a href="./prior.html" class="identifier">prior</a><iter>::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="./bidirectional-iterator.html">Bidirectional 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"><tt class="literal"><span class="pre">iter</span></tt> is decrementable.</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"><tt class="literal"><span class="pre">j</span></tt> is an iterator pointing to the previous element in the sequence.
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If <tt class="literal"><span class="pre">iter</span></tt> is a user-defined iterator, the library-provided default
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implementation is equivalent to</p>
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<pre class="last literal-block">
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typedef iter::<a href="./prior.html" class="identifier">prior</a> j;
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</pre>
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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="id434">
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
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<p>Amortized constant time.</p>
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</div>
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<div class="section" id="id435">
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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="./vector-c.html" class="identifier">vector_c</a><int,1> v;
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typedef <a href="./begin.html" class="identifier">begin</a><v>::type first;
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typedef <a href="./end.html" class="identifier">end</a><v>::type last;
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./prior.html" class="identifier">prior</a><last>::type, first > ));
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</pre>
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</div>
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<div class="section" id="id436">
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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="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./next.html">next</a>, <a class="reference internal" href="./deref.html">deref</a></p>
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<!-- Iterators/Iterator Metafunctions//deref |50 -->
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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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