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136 lines
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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: Variadic 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="./integral-sequence-wrapper.html" class="navigation-link">Prev</a> <a href="./classes.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./integral-sequence-wrapper.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.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="./concepts.html" class="navigation-link">Concepts</a> / <a href="./variadic-sequence.html" class="navigation-link">Variadic Sequence</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="variadic-sequence">
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<h1><a class="toc-backref" href="./concepts.html#id1404">Variadic Sequence</a></h1>
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<div class="section" id="id45">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>A <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> is a member of a family of sequence classes with both
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<em>variadic</em> and <em>numbered</em> forms. If <tt class="literal"><span class="pre">seq</span></tt> is a generic name for some
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<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, its <em>variadic form</em> allows us to specify a sequence of
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<em>n</em> elements <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>, for any <em>n</em> from 0 up to a
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<a class="reference internal" href="./configuration.html">preprocessor-configurable limit</a> <tt class="literal"><span class="pre">BOOST_MPL_LIMIT_</span></tt><em>seq</em><tt class="literal"><span class="pre">_SIZE</span></tt>,
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using the following notation:</p>
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<blockquote>
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<div class="line-block">
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<div class="line"><tt class="literal"><span class="pre">seq<</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">></span></tt></div>
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</div>
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</blockquote>
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<p>By contrast, each <em>numbered</em> sequence form accepts the exact number of elements
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that is encoded in the name of the corresponding class template:</p>
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<blockquote>
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<div class="line-block">
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<div class="line"><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">></span></tt></div>
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</div>
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</blockquote>
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<p>For numbered forms, there is no predefined top limit for <em>n</em>, aside from compiler
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limitations on the number of template parameters.</p>
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<!-- The variadic form of sequence ``seq`` is defined in
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``<boost/mpl/``\ *seq*\ ``.hpp>`` header.
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The numbered forms are defined in batches of 10. -->
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</div>
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<div class="section" id="id47">
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<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
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<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">seq</span></tt> is a placeholder token for the actual
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<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> name.</p>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="35%" />
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<col width="30%" />
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<col width="35%" />
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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">Type</th>
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<th class="head">Complexity</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">seq<</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">></span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">seq<</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">>::type</span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">></span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>Amortized constant time</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">>::type</span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>Amortized constant time</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="id48">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<pre class="literal-block">
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typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s;
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typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s;
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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">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">s</span></tt> is a sequence of elements <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>.</td>
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</tr>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">==</span> <span class="pre">n</span></tt>.<!-- FIXME .. parsed-literal::
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BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >));
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BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >));
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...
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BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); -->
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</td>
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</tr>
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</tbody>
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</table>
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<!-- .......................................................................... -->
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<pre class="literal-block">
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typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s;
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typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s;
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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">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">s</span></tt> is identical to <tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub> <tt class="literal"><span class="pre">></span></tt>.</td>
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</tr>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">==</span> <span class="pre">n</span></tt>.</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="id49">
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<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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<ul class="simple">
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<li><a class="reference internal" href="./vector.html">vector</a></li>
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<li><a class="reference internal" href="./list.html">list</a></li>
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<li><a class="reference internal" href="./map.html">map</a></li>
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</ul>
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</div>
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<div class="section" id="id50">
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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="./configuration.html">Configuration</a>, <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a></p>
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<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./integral-sequence-wrapper.html" class="navigation-link">Prev</a> <a href="./classes.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./integral-sequence-wrapper.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.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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