64 lines
2.1 KiB
HTML
64 lines
2.1 KiB
HTML
<html>
|
|
<head>
|
|
<title>BOOST_PP_LIST_AT_D</title>
|
|
<link rel="stylesheet" type="text/css" href="../styles.css">
|
|
</head>
|
|
<body>
|
|
<div style="margin-left: 0px;">
|
|
The <b>BOOST_PP_LIST_AT_D</b> macro extracts an element in a <i>list</i>.
|
|
It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
|
|
</div>
|
|
<h4>Usage</h4>
|
|
<div class="code">
|
|
<b>BOOST_PP_LIST_AT_D</b>(<i>d</i>, <i>list</i>, <i>index</i>)
|
|
</div>
|
|
<h4>Arguments</h4>
|
|
<dl>
|
|
<dt>d</dt>
|
|
<dd>
|
|
The next available <b>BOOST_PP_WHILE</b> iteration.
|
|
</dd>
|
|
<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>See Also</h4>
|
|
<ul>
|
|
<li><a href="list_at.html">BOOST_PP_LIST_AT</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/control/while.html">boost/preprocessor/control/while.hpp</a>>
|
|
#include <<a href="../headers/list/at.html">boost/preprocessor/list/at.hpp</a>>
|
|
|
|
#define LIST (7, (2, (0, (1, <a href="nil.html">BOOST_PP_NIL</a>))))
|
|
|
|
#define PRED(d, state) <a href="list_at_d.html">BOOST_PP_LIST_AT_D</a>(d, state, 0)
|
|
#define OP(d, state) <a href="list_rest.html">BOOST_PP_LIST_REST</a>(state)
|
|
|
|
<a href="while.html">BOOST_PP_WHILE</a>(PRED, OP, LIST) // expands to (0, (1, <a href="nil.html">BOOST_PP_NIL</a>))
|
|
</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>
|