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: bind</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="./lambda.html" class="navigation-link">Prev</a> <a href="./quote.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./lambda.html" class="navigation-link">Back</a> <a href="./quote.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./composition-and-argument-binding.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="./composition-and-argument-binding.html" class="navigation-link">Composition and Argument Binding</a> / <a href="./bind.html" class="navigation-link">bind</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="bind"> 15<h1><a class="toc-backref" href="./composition-and-argument-binding.html#id1531">bind</a></h1> 16<div class="section" id="id929"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename F 21 > 22struct bind0 23{ 24 // <em>unspecified</em> 25 // <em>...</em> 26}; 27 28template< 29 typename F, typename A1 30 > 31struct bind1 32{ 33 // <em>unspecified</em> 34 // <em>...</em> 35}; 36 37<em>...</em> 38 39template< 40 typename F, typename A1,<em>...</em> typename An 41 > 42struct <a href="./bind.html" class="identifier">bind</a><em>n</em> 43{ 44 // <em>unspecified</em> 45 // <em>...</em> 46}; 47 48template< 49 typename F 50 , typename A1 = <em>unspecified</em> 51 <em>...</em> 52 , typename An = <em>unspecified</em> 53 > 54struct <a href="./bind.html" class="identifier">bind</a> 55{ 56 // <em>unspecified</em> 57 // <em>...</em> 58}; 59</pre> 60</div> 61<div class="section" id="id930"> 62<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 63<p><tt class="literal"><span class="pre"><a href="./bind.html" class="identifier">bind</a></span></tt> is a higher-order primitive for <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> composition 64and argument binding. In essence, it's a compile-time counterpart of 65the similar run-time functionality provided by <a class="reference external" href="http://www.boost.org/libs/bind/bind.html" target="_top">Boost.Bind</a> and <a class="reference external" href="http://www.boost.org/libs/lambda/doc/index.html" target="_top">Boost.Lambda</a> 66libraries.</p> 67</div> 68<div class="section" id="id931"> 69<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 70<pre class="literal-block"> 71#include <<a href="../../../../boost/mpl/bind.hpp" class="header">boost/mpl/bind.hpp</a>> 72</pre> 73</div> 74<div class="section" id="id932"> 75<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 76<p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p> 77</div> 78<div class="section" id="id933"> 79<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 80<table border="1" class="docutils table"> 81<colgroup> 82<col width="15%" /> 83<col width="36%" /> 84<col width="48%" /> 85</colgroup> 86<thead valign="bottom"> 87<tr><th class="head">Parameter</th> 88<th class="head">Requirement</th> 89<th class="head">Description</th> 90</tr> 91</thead> 92<tbody valign="top"> 93<tr><td><tt class="literal"><span class="pre">F</span></tt></td> 94<td><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></td> 95<td>An metafunction class to perform binding on.</td> 96</tr> 97<tr><td><tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt></td> 98<td>Any type</td> 99<td>Arguments to bind.</td> 100</tr> 101</tbody> 102</table> 103</div> 104<div class="section" id="id934"> 105<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 106<p>For any <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> <tt class="literal"><span class="pre">f</span></tt> and arbitrary types <tt class="literal"><span class="pre">a1</span></tt>,... <tt class="literal"><span class="pre">an</span></tt>:</p> 107<pre class="literal-block"> 108typedef <a href="./bind.html" class="identifier">bind</a><f,a1,...a<em>n</em>> g; 109typedef <a href="./bind.html" class="identifier">bind</a><em>n</em><f,a1,...a<em>n</em>> g; 110</pre> 111<table class="docutils field-list" frame="void" rules="none"> 112<col class="field-name" /> 113<col class="field-body" /> 114<tbody valign="top"> 115<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></td> 116</tr> 117</tbody> 118</table> 119<table class="docutils field-list" frame="void" id="bind-semantics" rules="none"> 120<col class="field-name" /> 121<col class="field-body" /> 122<tbody valign="top"> 123<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 124<pre class="literal-block"> 125struct g 126{ 127 template< 128 typename U1 = <em>unspecified</em> 129 <em>...</em> 130 , typename U<em>n</em> = <em>unspecified</em> 131 > 132 struct <a href="./apply.html" class="identifier">apply</a> 133 : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< 134 typename h0<f,U1,<em>...</em>U<em>n</em>>::type 135 , typename h1<a1,U1,<em>...</em>U<em>n</em>>::type 136 <em>...</em> 137 , typename h<em>n</em><a<em>n</em>,U1,<em>...</em>U<em>n</em>>::type 138 > 139 { 140 }; 141}; 142</pre> 143<p>where <tt class="literal"><span class="pre">h</span></tt><em>k</em> is equivalent to</p> 144<pre class="literal-block"> 145template< typename X, typename U1,<em>...</em> typename U<em>n</em> > struct h<em>k</em> 146 : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em><X,U1,<em>...</em>U<em>n</em>> 147{ 148}; 149</pre> 150<p>if <tt class="literal"><span class="pre">f</span></tt> or <tt class="literal"><span class="pre">a</span></tt><em>k</em> is a <a class="reference internal" href="./terminology.html#bind-expression">bind expression</a> or a <a class="reference internal" href="./placeholders.html#placeholder">placeholder</a>, and</p> 151<pre class="literal-block"> 152template< typename X, typename U1,<em>...</em> typename U<em>n</em> > struct h<em>k</em> 153{ 154 typedef X type; 155}; 156</pre> 157<p class="last">otherwise. [<em>Note:</em> Every <tt class="literal"><span class="pre">n</span></tt>th appearance of the <a class="reference internal" href="./placeholders.html">unnamed placeholder</a> 158in the <tt class="literal"><span class="pre"><a href="./bind.html" class="identifier">bind</a><f,a1,...an></span></tt> specialization is replaced with the corresponding 159numbered placeholder <tt class="literal"><span class="pre">_</span></tt><em>n</em> — <em>end note</em>]</p> 160</td> 161</tr> 162</tbody> 163</table> 164</div> 165<div class="section" id="id936"> 166<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 167<pre class="literal-block"> 168struct f1 169{ 170 template< typename T1 > struct <a href="./apply.html" class="identifier">apply</a> 171 { 172 typedef T1 type; 173 }; 174}; 175 176struct f5 177{ 178 template< typename T1, typename T2, typename T3, typename T4, typename T5 > 179 struct <a href="./apply.html" class="identifier">apply</a> 180 { 181 typedef T5 type; 182 }; 183}; 184 185typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>< 186 <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt><f1,<a href="./placeholders.html" class="identifier">_1</a>> 187 , int 188 >::type r11; 189 190typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< 191 <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt><f1,<a href="./placeholders.html" class="identifier">_5</a>> 192 , void,void,void,void,int 193 >::type r12; 194 195<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r11,int> )); 196<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r12,int> )); 197 198typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< 199 <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt><f5,<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_3</a>,<a href="./placeholders.html" class="identifier">_4</a>,<a href="./placeholders.html" class="identifier">_5</a>> 200 , void,void,void,void,int 201 >::type r51; 202 203typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< 204 <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt><f5,<a href="./placeholders.html" class="identifier">_5</a>,<a href="./placeholders.html" class="identifier">_4</a>,<a href="./placeholders.html" class="identifier">_3</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_1</a>> 205 , int,void,void,void,void 206 >::type r52; 207 208<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r51,int> )); 209<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r52,int> )); 210</pre> 211</div> 212<div class="section" id="id937"> 213<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 214<p><a class="reference internal" href="./composition-and-argument-binding.html">Composition and Argument Binding</a>, <a class="reference internal" href="./invocation.html">invocation</a>, <a class="reference internal" href="./placeholders.html">Placeholders</a>, <a class="reference internal" href="./lambda.html">lambda</a>, <a class="reference internal" href="./quote.html">quote</a>, 215<a class="reference internal" href="./protect.html">protect</a>, <a class="reference internal" href="./apply.html">apply</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a></p> 216<!-- Metafunctions/Composition and Argument Binding//quote |40 --> 217</div> 218</div> 219 220<div class="footer-separator"></div> 221<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./lambda.html" class="navigation-link">Prev</a> <a href="./quote.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./lambda.html" class="navigation-link">Back</a> <a href="./quote.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./composition-and-argument-binding.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> 222<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 223Distributed under the Boost Software License, Version 1.0. (See accompanying 224file 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> 225</html> 226