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- <title>BOOST_PP_LIST_AT</title>
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- The <b>BOOST_PP_LIST_AT</b> macro extracts an element in a <i>list</i>.
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- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_LIST_AT</b>(<i>list</i>, <i>index</i>)
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- <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.
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- <dt>index</dt>
- <dd>
- The zero-based position in the <i>list</i> of the element to be extracted.
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- <h4>Remarks</h4>
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- 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.
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- <h4>See Also</h4>
- <ul>
- <li><a href="list_at_d.html">BOOST_PP_LIST_AT_D</a></li>
- </ul>
- <h4>Requirements</h4>
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- <b>Header:</b> <a href="../headers/list/at.html"><boost/preprocessor/list/at.hpp></a>
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- <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>
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- <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>
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