<?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 0.7: http://docutils.sourceforge.net/" /> <title>The MPL Reference Manual: bind</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="./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> <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> </tr></table><div class="header-separator"></div> <div class="section" id="bind"> <h1><a class="toc-backref" href="./composition-and-argument-binding.html#id1531">bind</a></h1> <div class="section" id="id929"> <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> <pre class="literal-block"> template< typename F > struct bind0 { // <em>unspecified</em> // <em>...</em> }; template< typename F, typename A1 > struct bind1 { // <em>unspecified</em> // <em>...</em> }; <em>...</em> template< typename F, typename A1,<em>...</em> typename An > struct <a href="./bind.html" class="identifier">bind</a><em>n</em> { // <em>unspecified</em> // <em>...</em> }; template< typename F , typename A1 = <em>unspecified</em> <em>...</em> , typename An = <em>unspecified</em> > struct <a href="./bind.html" class="identifier">bind</a> { // <em>unspecified</em> // <em>...</em> }; </pre> </div> <div class="section" id="id930"> <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> <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 and argument binding. In essence, it's a compile-time counterpart of the 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> libraries.</p> </div> <div class="section" id="id931"> <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> <pre class="literal-block"> #include <<a href="../../../../boost/mpl/bind.hpp" class="header">boost/mpl/bind.hpp</a>> </pre> </div> <div class="section" id="id932"> <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> <p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p> </div> <div class="section" id="id933"> <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> <table border="1" class="docutils table"> <colgroup> <col width="15%" /> <col width="36%" /> <col width="48%" /> </colgroup> <thead valign="bottom"> <tr><th class="head">Parameter</th> <th class="head">Requirement</th> <th class="head">Description</th> </tr> </thead> <tbody valign="top"> <tr><td><tt class="literal"><span class="pre">F</span></tt></td> <td><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></td> <td>An metafunction class to perform binding on.</td> </tr> <tr><td><tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt></td> <td>Any type</td> <td>Arguments to bind.</td> </tr> </tbody> </table> </div> <div class="section" id="id934"> <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> <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> <pre class="literal-block"> typedef <a href="./bind.html" class="identifier">bind</a><f,a1,...a<em>n</em>> g; typedef <a href="./bind.html" class="identifier">bind</a><em>n</em><f,a1,...a<em>n</em>> g; </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">Return type:</th><td class="field-body"><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></td> </tr> </tbody> </table> <table class="docutils field-list" frame="void" id="bind-semantics" 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"><p class="first">Equivalent to</p> <pre class="literal-block"> struct g { template< typename U1 = <em>unspecified</em> <em>...</em> , typename U<em>n</em> = <em>unspecified</em> > struct <a href="./apply.html" class="identifier">apply</a> : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< typename h0<f,U1,<em>...</em>U<em>n</em>>::type , typename h1<a1,U1,<em>...</em>U<em>n</em>>::type <em>...</em> , typename h<em>n</em><a<em>n</em>,U1,<em>...</em>U<em>n</em>>::type > { }; }; </pre> <p>where <tt class="literal"><span class="pre">h</span></tt><em>k</em> is equivalent to</p> <pre class="literal-block"> template< typename X, typename U1,<em>...</em> typename U<em>n</em> > struct h<em>k</em> : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em><X,U1,<em>...</em>U<em>n</em>> { }; </pre> <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> <pre class="literal-block"> template< typename X, typename U1,<em>...</em> typename U<em>n</em> > struct h<em>k</em> { typedef X type; }; </pre> <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> in 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 numbered placeholder <tt class="literal"><span class="pre">_</span></tt><em>n</em> — <em>end note</em>]</p> </td> </tr> </tbody> </table> </div> <div class="section" id="id936"> <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> <pre class="literal-block"> struct f1 { template< typename T1 > struct <a href="./apply.html" class="identifier">apply</a> { typedef T1 type; }; }; struct f5 { template< typename T1, typename T2, typename T3, typename T4, typename T5 > struct <a href="./apply.html" class="identifier">apply</a> { typedef T5 type; }; }; typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>< <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>> , int >::type r11; typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< <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>> , void,void,void,void,int >::type r12; <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r11,int> )); <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r12,int> )); typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< <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>> , void,void,void,void,int >::type r51; typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< <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>> , int,void,void,void,void >::type r52; <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r51,int> )); <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r52,int> )); </pre> </div> <div class="section" id="id937"> <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> <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>, <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> <!-- Metafunctions/Composition and Argument Binding//quote |40 --> </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="./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> <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>