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: Trivial Metafunction</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="./numeric-metafunction.html" class="navigation-link">Prev</a> <a href="./type-selection.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./numeric-metafunction.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunctions-concepts.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="./metafunctions-concepts.html" class="navigation-link">Concepts</a> / <a href="./trivial-metafunction.html" class="navigation-link">Trivial Metafunction</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="trivial-metafunction"> 15<h1><a class="toc-backref" href="./metafunctions-concepts.html#id1518">Trivial Metafunction</a></h1> 16<div class="section" id="id853"> 17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 18<p>A <a class="reference internal" href="./trivial-metafunction.html">Trivial Metafunction</a> accepts a single argument of a class type <tt class="literal"><span class="pre">x</span></tt> and 19returns the <tt class="literal"><span class="pre">x</span></tt>'s nested type member <tt class="literal"><span class="pre">x::name</span></tt>, where <tt class="literal"><span class="pre">name</span></tt> is 20a placeholder token for the actual member's name accessed by a specific 21metafunction's instance. By convention, all <a class="reference internal" href="./trivial-metafunctions-summary.html">trivial metafunctions</a> in MPL 22are named after the members they provide assess to. For instance, a <a class="reference internal" href="./trivial-metafunction.html">Trivial Metafunction</a> named <tt class="literal"><span class="pre">first</span></tt> reaches for the <tt class="literal"><span class="pre">x</span></tt>'s nested member 23<tt class="literal"><span class="pre">::first</span></tt>.</p> 24</div> 25<div class="section" id="id855"> 26<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> 27<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">name</span></tt> is placeholder token for the names of 28the <a class="reference internal" href="./trivial-metafunction.html">Trivial Metafunction</a> itself and the accessed member, and <tt class="literal"><span class="pre">x</span></tt> is 29a class type such that <tt class="literal"><span class="pre">x::name</span></tt> is a valid <em>type-name</em>.</p> 30<table border="1" class="docutils table"> 31<colgroup> 32<col width="37%" /> 33<col width="26%" /> 34<col width="37%" /> 35</colgroup> 36<thead valign="bottom"> 37<tr><th class="head">Expression</th> 38<th class="head">Type</th> 39<th class="head">Complexity</th> 40</tr> 41</thead> 42<tbody valign="top"> 43<tr><td><tt class="literal"><span class="pre">name<x>::type</span></tt></td> 44<td>Any type</td> 45<td>Constant time.</td> 46</tr> 47</tbody> 48</table> 49</div> 50<div class="section" id="id856"> 51<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 52<pre class="literal-block"> 53typedef name<x>::type r; 54</pre> 55<table class="docutils field-list" frame="void" rules="none"> 56<col class="field-name" /> 57<col class="field-body" /> 58<tbody valign="top"> 59<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">x::name</span></tt> is a valid <em>type-name</em>.</td> 60</tr> 61<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">is_same<r,x::name>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</td> 62</tr> 63</tbody> 64</table> 65</div> 66<div class="section" id="id857"> 67<h3><a class="subsection-title" href="#models" name="models">Models</a></h3> 68<ul class="simple"> 69<li><a class="reference internal" href="./trivial-metafunctions-summary.html#first">first</a></li> 70<li><a class="reference internal" href="./trivial-metafunctions-summary.html#second">second</a></li> 71<li><a class="reference internal" href="./trivial-metafunctions-summary.html#base">base</a></li> 72</ul> 73</div> 74<div class="section" id="id858"> 75<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 76<p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./trivial.html#label-metafunctions-trivial">Trivial Metafunctions</a>, <a class="reference internal" href="./identity.html">identity</a></p> 77</div> 78</div> 79 80<div class="footer-separator"></div> 81<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./numeric-metafunction.html" class="navigation-link">Prev</a> <a href="./type-selection.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./numeric-metafunction.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunctions-concepts.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> 82<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 83Distributed under the Boost Software License, Version 1.0. (See accompanying 84file 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> 85</html> 86