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: inherit_linearly</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="./inherit.html" class="navigation-link">Prev</a> <a href="./numeric-cast.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./inherit.html" class="navigation-link">Back</a> <a href="./numeric-cast.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./miscellaneous.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="./miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./inherit-linearly.html" class="navigation-link">inherit_linearly</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="inherit-linearly"> 15<h1><a class="toc-backref" href="./miscellaneous.html#id1567">inherit_linearly</a></h1> 16<div class="section" id="id1172"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename Types 21 , typename Node 22 , typename Root = <a href="./empty-base.html" class="identifier">empty_base</a> 23 > 24struct <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a> 25 : <a href="./fold.html" class="identifier">fold</a><Types,Root,Node> 26{ 27}; 28</pre> 29</div> 30<div class="section" id="id1173"> 31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 32<p>A convenience wrapper for <tt class="literal"><span class="pre"><a href="./fold.html" class="identifier">fold</a></span></tt> to use in the context of sequence-driven 33class composition. Returns the result the successive application of binary 34<tt class="literal"><span class="pre">Node</span></tt> to the result of the previous <tt class="literal"><span class="pre">Node</span></tt> invocation (<tt class="literal"><span class="pre">Root</span></tt> if it's 35the first call) and every type in the <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">Types</span></tt> in order.</p> 36</div> 37<div class="section" id="id1174"> 38<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 39<pre class="literal-block"> 40#include <<a href="../../../../boost/mpl/inherit_linearly.hpp" class="header">boost/mpl/inherit_linearly.hpp</a>> 41</pre> 42</div> 43<div class="section" id="id1175"> 44<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 45<p><a class="reference internal" href="./metafunction.html">Metafunction</a></p> 46</div> 47<div class="section" id="id1176"> 48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 49<table border="1" class="docutils table"> 50<colgroup> 51<col width="15%" /> 52<col width="32%" /> 53<col width="53%" /> 54</colgroup> 55<thead valign="bottom"> 56<tr><th class="head">Parameter</th> 57<th class="head">Requirement</th> 58<th class="head">Description</th> 59</tr> 60</thead> 61<tbody valign="top"> 62<tr><td><tt class="literal"><span class="pre">Types</span></tt></td> 63<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 64<td>Types to inherit from.</td> 65</tr> 66<tr><td><tt class="literal"><span class="pre">Node</span></tt></td> 67<td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> 68<td>A derivation metafunction.</td> 69</tr> 70<tr><td><tt class="literal"><span class="pre">Root</span></tt></td> 71<td>A class type</td> 72<td>A type to be placed at the root of the class 73hierarchy.</td> 74</tr> 75</tbody> 76</table> 77</div> 78<div class="section" id="id1177"> 79<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 80<p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">types</span></tt>, binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">node</span></tt>, and arbitrary 81class type <tt class="literal"><span class="pre">root</span></tt>:</p> 82<pre class="literal-block"> 83typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a><types,node,root>::type r; 84</pre> 85<table class="docutils field-list" frame="void" rules="none"> 86<col class="field-name" /> 87<col class="field-body" /> 88<tbody valign="top"> 89<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A class type.</p> 90</td> 91</tr> 92<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 93<pre class="last literal-block"> 94typedef <a href="./fold.html" class="identifier">fold</a><types,root,node>::type r; 95</pre> 96</td> 97</tr> 98</tbody> 99</table> 100</div> 101<div class="section" id="id1178"> 102<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 103<p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><types>::value</span></tt> applications of <tt class="literal"><span class="pre">node</span></tt>.</p> 104</div> 105<div class="section" id="id1179"> 106<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 107<pre class="literal-block"> 108template< typename T > struct tuple_field 109{ 110 T field; 111}; 112 113template< typename T > 114inline 115T& field(tuple_field<T>& t) 116{ 117 return t.field; 118} 119 120typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>< 121 <a href="./vector.html" class="identifier">vector</a><int,char const*,bool> 122 , <a href="./inherit.html" class="identifier">inherit</a>< <a href="./placeholders.html" class="identifier">_1</a>, tuple_field<<a href="./placeholders.html" class="identifier">_2</a>> > 123 >::type tuple; 124 125 126int main() 127{ 128 tuple t; 129 130 field<int>(t) = -1; 131 field<char const*>(t) = "text"; 132 field<bool>(t) = false; 133 134 std::cout 135 << field<int>(t) << 'n' 136 << field<char const*>(t) << 'n' 137 << field<bool>(t) << 'n' 138 ; 139} 140</pre> 141</div> 142<div class="section" id="id1180"> 143<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 144<p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./algorithms.html">Algorithms</a>, <a class="reference internal" href="./inherit.html">inherit</a>, <a class="reference internal" href="./empty-base.html">empty_base</a>, <a class="reference internal" href="./fold.html">fold</a>, <a class="reference internal" href="./reverse-fold.html">reverse_fold</a></p> 145<!-- Metafunctions/Miscellaneous//numeric_cast |50 --> 146</div> 147</div> 148 149<div class="footer-separator"></div> 150<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./inherit.html" class="navigation-link">Prev</a> <a href="./numeric-cast.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./inherit.html" class="navigation-link">Back</a> <a href="./numeric-cast.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./miscellaneous.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> 151<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 152Distributed under the Boost Software License, Version 1.0. (See accompanying 153file 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> 154</html> 155