projects / ceph.git / blame
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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: arg</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="./quote.html" class="navigation-link">Prev</a> <a href="./protect.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./quote.html" class="navigation-link">Back</a> <a href="./protect.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="./arg.html" class="navigation-link">arg</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="arg"> | |
| 15 | <h1><a class="toc-backref" href="./composition-and-argument-binding.html#id1533">arg</a></h1> | |
| 16 | <div class="section" id="id946"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< int n > struct <a href="./arg.html" class="identifier">arg</a>; | |
| 20 | ||
| 21 | template<> struct <a href="./arg.html" class="identifier">arg</a><1> | |
| 22 | { | |
| 23 | template< typename A1,<em>...</em> typename A<em>n</em> = <em>unspecified</em> > | |
| 24 | struct <a href="./apply.html" class="identifier">apply</a> | |
| 25 | { | |
| 26 | typedef A1 type; | |
| 27 | }; | |
| 28 | }; | |
| 29 | ||
| 30 | <em>...</em> | |
| 31 | ||
| 32 | template<> struct <a href="./arg.html" class="identifier">arg</a><<em>n</em>> | |
| 33 | { | |
| 34 | template< typename A1,<em>...</em> typename A<em>n</em> > | |
| 35 | struct <a href="./apply.html" class="identifier">apply</a> | |
| 36 | { | |
| 37 | typedef A<em>n</em> type; | |
| 38 | }; | |
| 39 | }; | |
| 40 | </pre> | |
| 41 | </div> | |
| 42 | <div class="section" id="id947"> | |
| 43 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 44 | <p><tt class="literal"><span class="pre"><a href="./arg.html" class="identifier">arg</a><n></span></tt> specialization is a <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> that return the <tt class="literal"><span class="pre">n</span></tt>th of its arguments.</p> | |
| 45 | </div> | |
| 46 | <div class="section" id="id948"> | |
| 47 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 48 | <pre class="literal-block"> | |
| 49 | #include <<a href="../../../../boost/mpl/arg.hpp" class="header">boost/mpl/arg.hpp</a>> | |
| 50 | </pre> | |
| 51 | </div> | |
| 52 | <div class="section" id="id949"> | |
| 53 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 54 | <table border="1" class="docutils table"> | |
| 55 | <colgroup> | |
| 56 | <col width="15%" /> | |
| 57 | <col width="36%" /> | |
| 58 | <col width="48%" /> | |
| 59 | </colgroup> | |
| 60 | <thead valign="bottom"> | |
| 61 | <tr><th class="head">Parameter</th> | |
| 62 | <th class="head">Requirement</th> | |
| 63 | <th class="head">Description</th> | |
| 64 | </tr> | |
| 65 | </thead> | |
| 66 | <tbody valign="top"> | |
| 67 | <tr><td><tt class="literal"><span class="pre">n</span></tt></td> | |
| 68 | <td>An integral constant</td> | |
| 69 | <td>A number of argument to return.</td> | |
| 70 | </tr> | |
| 71 | </tbody> | |
| 72 | </table> | |
| 73 | </div> | |
| 74 | <div class="section" id="id950"> | |
| 75 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 76 | <p>For any integral constant <tt class="literal"><span class="pre">n</span></tt> in the range [1, <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>] and | |
| 77 | arbitrary types <tt class="literal"><span class="pre">a1</span></tt>,... <tt class="literal"><span class="pre">an</span></tt>:</p> | |
| 78 | <pre class="literal-block"> | |
| 79 | typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< <a href="./arg.html" class="identifier">arg</a><<em>n</em>>,a1,<em>...</em>a<em>n</em> >::type x; | |
| 80 | </pre> | |
| 81 | <table class="docutils field-list" frame="void" rules="none"> | |
| 82 | <col class="field-name" /> | |
| 83 | <col class="field-body" /> | |
| 84 | <tbody valign="top"> | |
| 85 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td> | |
| 86 | </tr> | |
| 87 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">x</span></tt> is identical to <tt class="literal"><span class="pre">an</span></tt>.</td> | |
| 88 | </tr> | |
| 89 | </tbody> | |
| 90 | </table> | |
| 91 | </div> | |
| 92 | <div class="section" id="id951"> | |
| 93 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 94 | <pre class="literal-block"> | |
| 95 | typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< <a href="./arg.html" class="identifier">arg</a><1>,bool,char,short,int,long >::type t1; | |
| 96 | typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< <a href="./arg.html" class="identifier">arg</a><3>,bool,char,short,int,long >::type t3; | |
| 97 | ||
| 98 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< t1, bool > )); | |
| 99 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< t3, short > )); | |
| 100 | </pre> | |
| 101 | </div> | |
| 102 | <div class="section" id="id952"> | |
| 103 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 104 | <p><a class="reference internal" href="./composition-and-argument-binding.html">Composition and Argument Binding</a>, <a class="reference internal" href="./placeholders.html">Placeholders</a>, <a class="reference internal" href="./lambda.html">lambda</a>, <a class="reference internal" href="./bind.html">bind</a>, <a class="reference internal" href="./apply.html">apply</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a></p> | |
| 105 | <!-- Metafunctions/Composition and Argument Binding//protect |60 --> | |
| 106 | </div> | |
| 107 | </div> | |
| 108 | ||
| 109 | <div class="footer-separator"></div> | |
| 110 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./quote.html" class="navigation-link">Prev</a> <a href="./protect.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./quote.html" class="navigation-link">Back</a> <a href="./protect.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> | |
| 111 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 112 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 113 | 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> | |
| 114 | </html> |