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- <html>
- <head>
- <title>BOOST_PP_LIST_FIRST_N_D</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
- <body>
- <div style="margin-left: 0px;">
- The <b>BOOST_PP_LIST_FIRST_N_D</b> macro expands to a <i>list</i> of the first <i>count</i> elements of 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_FIRST_N_D</b>(<i>d</i>, <i>count</i>, <i>list</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>d</dt>
- <dd>
- The next available <b>BOOST_PP_WHILE</b> iteration.
- </dd>
- <dt>count</dt>
- <dd>
- The number of elements to extract.
- </dd>
- <dt>list</dt>
- <dd>
- The <i>list</i> from which the elements are extracted.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- This macro extracts <i>count</i> elements from the beginning of <i>list</i> and returns them as a <i>list</i>
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="list_first_n.html">BOOST_PP_LIST_FIRST_N</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/list/first_n.html"><boost/preprocessor/list/first_n.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/list/first_n.html">boost/preprocessor/list/first_n.hpp</a>>
- #include <<a href="../headers/list/fold_left.html">boost/preprocessor/list/fold_right.hpp</a>>
- #define L1 (a, (b, (c, (d, <a href="nil.html">BOOST_PP_NIL</a>))))
- #define L2 (L1, (L1, (L1, <a href="nil.html">BOOST_PP_NIL</a>)))
- #define OP(d, state, x) (<a href="list_first_n_d.html">BOOST_PP_LIST_FIRST_N_D</a>(d, 2, x), state)
- <a href="list_fold_right.html">BOOST_PP_LIST_FOLD_RIGHT</a>(OP, <a href="nil.html">BOOST_PP_NIL</a>, L2)
- /*
- expands to...
- ((a, (b, <a href="nil.html">BOOST_PP_NIL</a>)), ((a, (b, <a href="nil.html">BOOST_PP_NIL</a>)),
- ((a, (b, <a href="nil.html">BOOST_PP_NIL</a>)) , <a href="nil.html">BOOST_PP_NIL</a> )))
- */
- </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>
- </div>
- </body>
- </html>
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