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<html> <head> <title>BOOST_PP_LIST_AT</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_LIST_AT</b> macro extracts an element in a <i>list</i>. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_LIST_AT</b>(<i>list</i>, <i>index</i>) </div> <h4>Arguments</h4> <dl> <dt>list</dt> <dd> The <i>list</i> from which a element is to be extracted. This <i>list</i> must have at least <i>index</i> + <i>1</i> elements. </dd> <dt>index</dt> <dd> The zero-based position in the <i>list</i> of the element to be extracted. </dd> </dl> <h4>Remarks</h4> <div> Previously, this macro could not be used inside <b>BOOST_PP_WHILE</b>. There is no longer any such restriction. It is more efficient, however, to use <b>BOOST_PP_LIST_AT_D</b> in such a situation. </div> <h4>See Also</h4> <ul> <li><a href="list_at_d.html">BOOST_PP_LIST_AT_D</a></li> </ul> <h4>Requirements</h4> <div> <b>Header:</b> <a href="../headers/list/at.html"><boost/preprocessor/list/at.hpp></a> </div> <h4>Sample Code</h4> <div><pre> #include <<a href="../headers/list/at.html">boost/preprocessor/list/at.hpp</a>> #define LIST (a, (b, (c, <a href="nil.html">BOOST_PP_NIL</a>))) <a href="list_at.html">BOOST_PP_LIST_AT</a>(LIST, 0) // expands to a <a href="list_at.html">BOOST_PP_LIST_AT</a>(LIST, 2) // expands to c </pre></div> <hr size="1"> <div style="margin-left: 0px;"> <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> </br><i>© Copyright Paul Mensonides 2002</i> </div> <div style="margin-left: 0px;"> <p><small>Distributed under the Boost Software License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at <a href= "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> </div> </body> </html>
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