1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Element access</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../class_template_tuple.html" title="Class template tuple"> 9<link rel="prev" href="tuple_helper_classes.html" title="Tuple helper classes"> 10<link rel="next" href="relational_operators.html" title="Relational operators"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="tuple_helper_classes.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../class_template_tuple.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="relational_operators.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fusion.tuple.class_template_tuple.element_access"></a><a class="link" href="element_access.html" title="Element access">Element 28 access</a> 29</h4></div></div></div> 30<h6> 31<a name="fusion.tuple.class_template_tuple.element_access.h0"></a> 32 <span class="phrase"><a name="fusion.tuple.class_template_tuple.element_access.description"></a></span><a class="link" href="element_access.html#fusion.tuple.class_template_tuple.element_access.description">Description</a> 33 </h6> 34<p> 35 The <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target="_top">TR1 36 Tuple</a> provides the <code class="computeroutput"><span class="identifier">get</span></code> 37 function to provide access to it's elements by zero based numeric index. 38 </p> 39<h6> 40<a name="fusion.tuple.class_template_tuple.element_access.h1"></a> 41 <span class="phrase"><a name="fusion.tuple.class_template_tuple.element_access.specification"></a></span><a class="link" href="element_access.html#fusion.tuple.class_template_tuple.element_access.specification">Specification</a> 42 </h6> 43<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="identifier">T</span><span class="special">></span> 44<span class="identifier">RJ</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">T</span><span class="special">&</span> <span class="identifier">t</span><span class="special">);</span> 45</pre> 46<p> 47 <span class="bold"><strong>Requires</strong></span>: <code class="computeroutput"><span class="number">0</span> 48 <span class="special"><</span> <span class="identifier">I</span> 49 <span class="special"><=</span> <span class="identifier">N</span></code>. 50 The program is ill formed if <code class="computeroutput"><span class="identifier">I</span></code> 51 is out of bounds. <code class="computeroutput"><span class="identifier">T</span></code> is 52 any fusion sequence type, including <code class="computeroutput"><span class="identifier">tuple</span></code>. 53 </p> 54<p> 55 <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="identifier">RJ</span></code> 56 is equivalent to <code class="computeroutput"><a class="link" href="../../sequence/intrinsic/metafunctions/at_c.html" title="at_c"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span></code>. 57 </p> 58<p> 59 <span class="bold"><strong>Returns</strong></span>: A reference to the <code class="computeroutput"><span class="identifier">I</span></code>th element of <code class="computeroutput"><span class="identifier">T</span></code>. 60 </p> 61<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 62<span class="identifier">PJ</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">t</span><span class="special">);</span> 63</pre> 64<p> 65 <span class="bold"><strong>Requires</strong></span>: <code class="computeroutput"><span class="number">0</span> 66 <span class="special"><</span> <span class="identifier">I</span> 67 <span class="special"><=</span> <span class="identifier">N</span></code>. 68 The program is ill formed if <code class="computeroutput"><span class="identifier">I</span></code> 69 is out of bounds. <code class="computeroutput"><span class="identifier">T</span></code> is 70 any fusion sequence type, including <code class="computeroutput"><span class="identifier">tuple</span></code>. 71 </p> 72<p> 73 <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="identifier">PJ</span></code> 74 is equivalent to <code class="computeroutput"><a class="link" href="../../sequence/intrinsic/metafunctions/at_c.html" title="at_c"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span></code>. 75 </p> 76<p> 77 <span class="bold"><strong>Returns</strong></span>: A const reference to the <code class="computeroutput"><span class="identifier">I</span></code>th element of <code class="computeroutput"><span class="identifier">T</span></code>. 78 </p> 79</div> 80<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 81<td align="left"></td> 82<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 83 Dan Marsden, Tobias Schwinger<p> 84 Distributed under the Boost Software License, Version 1.0. (See accompanying 85 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 86 </p> 87</div></td> 88</tr></table> 89<hr> 90<div class="spirit-nav"> 91<a accesskey="p" href="tuple_helper_classes.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../class_template_tuple.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="relational_operators.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 92</div> 93</body> 94</html> 95
