<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" /> <title>The MPL Reference Manual: Variadic Sequence</title> <link rel="stylesheet" href="../style.css" type="text/css" /> </head> <body class="docframe refmanual"> <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> <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> </tr></table><div class="header-separator"></div> <div class="section" id="variadic-sequence"> <h1><a class="toc-backref" href="./concepts.html#id1387">Variadic Sequence</a></h1> <div class="section" id="id45"> <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> <p>A <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> is a member of a family of sequence classes with both <em>variadic</em> and <em>numbered</em> forms. If <tt class="literal"><span class="pre">seq</span></tt> is a generic name for some <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, its <em>variadic form</em> allows us to specify a sequence of <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 <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>, using the following notation:</p> <blockquote> <div class="line-block"> <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> </div> </blockquote> <p>By contrast, each <em>numbered</em> sequence form accepts the exact number of elements that is encoded in the name of the corresponding class template:</p> <blockquote> <div class="line-block"> <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> </div> </blockquote> <p>For numbered forms, there is no predefined top limit for <em>n</em>, aside from compiler limitations on the number of template parameters.</p> <!-- The variadic form of sequence ``seq`` is defined in ``<boost/mpl/``\ *seq*\ ``.hpp>`` header. The numbered forms are defined in batches of 10. --> </div> <div class="section" id="id47"> <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">seq</span></tt> is a placeholder token for the actual <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> name.</p> <table border="1" class="docutils table"> <colgroup> <col width="35%" /> <col width="30%" /> <col width="35%" /> </colgroup> <thead valign="bottom"> <tr><th class="head">Expression</th> <th class="head">Type</th> <th class="head">Complexity</th> </tr> </thead> <tbody valign="top"> <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> <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> <td>Amortized constant time</td> </tr> <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> <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> <td>Amortized constant time</td> </tr> <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> <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> <td>Amortized constant time</td> </tr> <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> <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> <td>Amortized constant time</td> </tr> </tbody> </table> </div> <div class="section" id="id48"> <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> <pre class="literal-block"> typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s; typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s; </pre> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <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> </tr> <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:: BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >)); BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >)); ... BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); --> </td> </tr> </tbody> </table> <!-- .......................................................................... --> <pre class="literal-block"> typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s; 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; </pre> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <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> </tr> <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> </tr> </tbody> </table> </div> <div class="section" id="id49"> <h3><a class="subsection-title" href="#models" name="models">Models</a></h3> <ul class="simple"> <li><a class="reference internal" href="./vector.html">vector</a></li> <li><a class="reference internal" href="./list.html">list</a></li> <li><a class="reference internal" href="./map.html">map</a></li> </ul> </div> <div class="section" id="id50"> <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> <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> </div> </div> <div class="footer-separator"></div> <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> <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> Distributed under the Boost Software License, Version 1.0. (See accompanying 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> </html>