91 lines
6.9 KiB
HTML
91 lines
6.9 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: empty_sequence</title>
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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="./views.html" class="navigation-link">Prev</a> <a href="./filter-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./filter-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./empty-sequence.html" class="navigation-link">empty_sequence</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="empty-sequence">
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<h1><a class="toc-backref" href="./views.html#id1417">empty_sequence</a></h1>
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<div class="section" id="id120">
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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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struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
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{
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// <em>unspecified</em>
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// <em>...</em>
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};
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</pre>
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</div>
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<div class="section" id="id121">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Represents a sequence containing no elements.</p>
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</div>
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<div class="section" id="id122">
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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/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id123">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>The semantics of an expression are defined only
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where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
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<p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt>.</p>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="34%" />
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<col width="66%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Expression</th>
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<th class="head">Semantics</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"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td>
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<td>An empty <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td>
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<td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">==</span> <span class="pre">0</span></tt>; see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</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="id124">
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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="./begin.html" class="identifier">begin</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type first;
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typedef <a href="./end.html" class="identifier">end</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type last;
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<first,last> ));
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::value, ==, 0 );
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typedef <a href="./transform-view.html" class="identifier">transform_view</a><
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<a href="./empty-sequence.html" class="identifier">empty_sequence</a>
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, add_pointer<_>
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> empty_view;
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::value, ==, 0 );
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</pre>
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</div>
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<div class="section" id="id125">
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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="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./vector.html">vector</a>, <a class="reference internal" href="./list.html">list</a>, <a class="reference internal" href="./single-view.html">single_view</a></p>
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<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./views.html" class="navigation-link">Prev</a> <a href="./filter-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./filter-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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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