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- <html>
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- <title>BOOST_PP_LIST_TRANSFORM</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
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- <div style="margin-left: 0px;">
- The <b>BOOST_PP_LIST_TRANSFORM</b> macro transforms each element in a <i>list</i> according to a supplied transformation.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_LIST_TRANSFORM</b>(<i>op</i>, <i>data</i>, <i>list</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>op</dt>
- <dd>
- A ternary predicate of the form <i>op</i>(<i>d</i>, <i>data</i>, <i>elem</i>).
- This transformation is expanded by <b>BOOST_PP_LIST_TRANSFORM</b> for each element in <i>list</i> with the next available <b>BOOST_PP_WHILE</b> iteration,
- the auxiliary <i>data</i>, and the current element in <i>list</i>.
- </dd>
- <dt>data</dt>
- <dd>
- Auxiliary data passed to <i>pred</i>.
- </dd>
- <dt>list</dt>
- <dd>
- The <i>list</i> to be transformed.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- This macro expands <i>op</i> for each element in <i>list</i>.
- It builds a new <i>list</i> out of the results of each call.
- If, for example, <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))),
- this macro expands to...
- <div>
- (<i>op</i>(<i>d</i>, <i>data</i>, <i>a</i>), (<i>op</i>(<i>d</i>, <i>data</i>, <i>b</i>), (<i>op</i>(<i>d</i>, <i>data</i>, <i>c</i>), <b>BOOST_PP_NIL</b>)))
- </div>
- </div>
- <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_TRANSFORM_D</b> in such a situation.
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="list_transform_d.html">BOOST_PP_LIST_TRANSFORM_D</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/list/transform.html"><boost/preprocessor/list/transform.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/arithmetic/dec.html">boost/preprocessor/arithmetic/dec.hpp</a>>
- #include <<a href="../headers/list/transform.html">boost/preprocessor/list/transform.hpp</a>>
- #define LIST (1, (3, (2, (5, <a href="nil.html">BOOST_PP_NIL</a>))))
- #define OP(d, data, elem) <a href="dec.html">BOOST_PP_DEC</a>(elem)
- <a href="list_transform.html">BOOST_PP_LIST_TRANSFORM</a>(OP, 3, LIST)
- // expands to (0, (2, (1, (4, <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>
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