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| <title>BOOST_PP_LIST_TRANSFORM</title> |
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| The <b>BOOST_PP_LIST_TRANSFORM</b> macro transforms each element in a <i>list</i> according to a supplied transformation. |
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| <h4>Usage</h4> |
| <div class="code"> |
| <b>BOOST_PP_LIST_TRANSFORM</b>(<i>op</i>, <i>data</i>, <i>list</i>) |
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| <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> |
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| 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... |
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| (<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>))) |
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| </div> |
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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_TRANSFORM_D</b> in such a situation. |
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| <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> |
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| <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> |
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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> |
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