1<?xml version="1.0" encoding="utf-8" ?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> 7<title>The MPL Reference Manual: Variadic Sequence</title> 8<link rel="stylesheet" href="../style.css" type="text/css" /> 9</head> 10<body class="docframe refmanual"> 11<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> 12<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> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="variadic-sequence"> 15<h1><a class="toc-backref" href="./concepts.html#id1404">Variadic Sequence</a></h1> 16<div class="section" id="id45"> 17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 18<p>A <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> is a member of a family of sequence classes with both 19<em>variadic</em> and <em>numbered</em> forms. If <tt class="literal"><span class="pre">seq</span></tt> is a generic name for some 20<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, its <em>variadic form</em> allows us to specify a sequence of 21<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 22<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>, 23using the following notation:</p> 24<blockquote> 25<div class="line-block"> 26<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> 27</div> 28</blockquote> 29<p>By contrast, each <em>numbered</em> sequence form accepts the exact number of elements 30that is encoded in the name of the corresponding class template:</p> 31<blockquote> 32<div class="line-block"> 33<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> 34</div> 35</blockquote> 36<p>For numbered forms, there is no predefined top limit for <em>n</em>, aside from compiler 37limitations on the number of template parameters.</p> 38<!-- The variadic form of sequence ``seq`` is defined in 39``<boost/mpl/``\ *seq*\ ``.hpp>`` header. 40The numbered forms are defined in batches of 10. --> 41</div> 42<div class="section" id="id47"> 43<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> 44<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">seq</span></tt> is a placeholder token for the actual 45<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> name.</p> 46<table border="1" class="docutils table"> 47<colgroup> 48<col width="35%" /> 49<col width="30%" /> 50<col width="35%" /> 51</colgroup> 52<thead valign="bottom"> 53<tr><th class="head">Expression</th> 54<th class="head">Type</th> 55<th class="head">Complexity</th> 56</tr> 57</thead> 58<tbody valign="top"> 59<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> 60<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 61<td>Amortized constant time</td> 62</tr> 63<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> 64<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 65<td>Amortized constant time</td> 66</tr> 67<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> 68<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 69<td>Amortized constant time</td> 70</tr> 71<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> 72<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 73<td>Amortized constant time</td> 74</tr> 75</tbody> 76</table> 77</div> 78<div class="section" id="id48"> 79<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 80<pre class="literal-block"> 81typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s; 82typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s; 83</pre> 84<table class="docutils field-list" frame="void" rules="none"> 85<col class="field-name" /> 86<col class="field-body" /> 87<tbody valign="top"> 88<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> 89</tr> 90<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:: 91 92BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >)); 93BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >)); 94... 95BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); --> 96</td> 97</tr> 98</tbody> 99</table> 100<!-- .......................................................................... --> 101<pre class="literal-block"> 102typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s; 103typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s; 104</pre> 105<table class="docutils field-list" frame="void" rules="none"> 106<col class="field-name" /> 107<col class="field-body" /> 108<tbody valign="top"> 109<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> 110</tr> 111<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> 112</tr> 113</tbody> 114</table> 115</div> 116<div class="section" id="id49"> 117<h3><a class="subsection-title" href="#models" name="models">Models</a></h3> 118<ul class="simple"> 119<li><a class="reference internal" href="./vector.html">vector</a></li> 120<li><a class="reference internal" href="./list.html">list</a></li> 121<li><a class="reference internal" href="./map.html">map</a></li> 122</ul> 123</div> 124<div class="section" id="id50"> 125<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 126<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> 127</div> 128</div> 129 130<div class="footer-separator"></div> 131<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> 132<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 133Distributed under the Boost Software License, Version 1.0. (See accompanying 134file 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> 135</html> 136