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: c_str</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="./string-operations.html" class="navigation-link">Prev</a> <a href="./miscellaneous.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./string-operations.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="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./string-operations.html" class="navigation-link">String Operations</a> / <a href="./c-str.html" class="navigation-link">c_str</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="c-str"> 15<h1><a class="toc-backref" href="./string-operations.html#id1562">c_str</a></h1> 16<div class="section" id="id1137"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename Sequence 21 > 22struct <a href="./c-str.html" class="identifier">c_str</a> 23{ 24 typedef <em>unspecified</em> type; 25 static char const value[]; 26}; 27</pre> 28</div> 29<div class="section" id="id1138"> 30<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 31<p><tt class="literal"><span class="pre"><a href="./c-str.html" class="identifier">c_str</a></span></tt> converts the <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of <a class="reference internal" href="./integral-constant.html">Integral Constant</a>s <tt class="literal"><span class="pre">Sequence</span></tt> 32into a null-terminated byte string containing an equivalent sequence.</p> 33</div> 34<div class="section" id="id1139"> 35<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 36<pre class="literal-block"> 37#include <<a href="../../../../boost/mpl/string.hpp" class="header">boost/mpl/string.hpp</a>> 38</pre> 39</div> 40<div class="section" id="id1140"> 41<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 42<p><a class="reference internal" href="./metafunction.html">Metafunction</a></p> 43</div> 44<div class="section" id="id1141"> 45<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 46<table border="1" class="docutils table"> 47<colgroup> 48<col width="17%" /> 49<col width="30%" /> 50<col width="53%" /> 51</colgroup> 52<thead valign="bottom"> 53<tr><th class="head">Parameter</th> 54<th class="head">Requirement</th> 55<th class="head">Description</th> 56</tr> 57</thead> 58<tbody valign="top"> 59<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> 60<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of 61<a class="reference internal" href="./integral-constant.html">Integral Constant</a>s</td> 62<td>A sequence to be converted into a 63null-terminated byte string.</td> 64</tr> 65</tbody> 66</table> 67</div> 68<div class="section" id="id1142"> 69<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 70<div class="expression-semantics compound"> 71<p class="compound-first">For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of <a class="reference internal" href="./integral-constant.html">Integral Constant</a>s <tt class="literal"><span class="pre">s</span></tt>,</p> 72<pre class="compound-middle literal-block"> 73<a href="./c-str.html" class="identifier">c_str</a><s>::value; 74</pre> 75<table class="compound-last docutils field-list" frame="void" rules="none"> 76<col class="field-name" /> 77<col class="field-body" /> 78<tbody valign="top"> 79<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A null-terminated byte string.</p> 80</td> 81</tr> 82<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre"><=</span> <span class="pre">BOOST_MPL_STRING_MAX_LENGTH</span></tt>.</p> 83</td> 84</tr> 85<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 86<pre class="last literal-block"> 87char const value[] = { 88 <a href="./at.html" class="identifier">at</a><s, 0>::type::value 89 , ... 90 , <a href="./at.html" class="identifier">at</a><s, <a href="./size.html" class="identifier">size</a><s>::value-1>::type::value 91 , '\0' 92}; 93</pre> 94</td> 95</tr> 96</tbody> 97</table> 98</div> 99</div> 100<div class="section" id="id1143"> 101<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 102<table border="1" class="docutils table"> 103<colgroup> 104<col width="47%" /> 105<col width="53%" /> 106</colgroup> 107<thead valign="bottom"> 108<tr><th class="head">Sequence archetype</th> 109<th class="head">Complexity</th> 110</tr> 111</thead> 112<tbody valign="top"> 113<tr><td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 114<td>Linear.</td> 115</tr> 116</tbody> 117</table> 118</div> 119<div class="section" id="id1144"> 120<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 121<pre class="literal-block"> 122typedef <a href="./vector-c.html" class="identifier">vector_c</a><char,'h','e','l','l','o'> hello; 123assert( 0 == std::strcmp( <a href="./c-str.html" class="identifier">c_str</a><hello>::value, "hello" ) ); 124</pre> 125</div> 126<div class="section" id="id1145"> 127<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 128<p><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>, <a class="reference internal" href="./integral-constant.html">Integral Constant</a>, <a class="reference internal" href="./string.html">string</a></p> 129</div> 130</div> 131 132<div class="footer-separator"></div> 133<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./string-operations.html" class="navigation-link">Prev</a> <a href="./miscellaneous.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./string-operations.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> 134<td><div class="copyright-footer"><div class="copyright">Copyright © 2009 Eric Niebler</div> 135Distributed under the Boost Software License, Version 1.0. (See accompanying 136file 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> 137</html> 138