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87 lines
3.4 KiB
HTML
87 lines
3.4 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_LIST_TRANSFORM_D</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_LIST_TRANSFORM_D</b> macro transforms each element in a <i>list</i> according to a supplied transformation.
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It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_LIST_TRANSFORM_D</b>(<i>d</i>, <i>op</i>, <i>data</i>, <i>list</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>d</dt>
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<dd>
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The next available <b>BOOST_PP_WHILE</b> iteration.
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</dd>
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<dt>op</dt>
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<dd>
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A ternary predicate of the form <i>op</i>(<i>d</i>, <i>data</i>, <i>elem</i>).
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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,
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the auxiliary <i>data</i>, and the current element in <i>list</i>.
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</dd>
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<dt>data</dt>
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<dd>
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Auxiliary data passed to <i>pred</i>.
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</dd>
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<dt>list</dt>
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<dd>
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The <i>list</i> to be transformed.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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This macro expands <i>op</i> for each element in <i>list</i>.
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It builds a new <i>list</i> out of the results of each call.
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If, for example, <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))),
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this macro expands to...
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<div>
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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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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="list_transform.html">BOOST_PP_LIST_TRANSFORM</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/list/transform.html"><boost/preprocessor/list/transform.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div><pre>
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#include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>>
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#include <<a href="../headers/list/fold_right.html">boost/preprocessor/list/fold_right.hpp</a>>
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#include <<a href="../headers/list/transform.html">boost/preprocessor/list/transform.hpp</a>>
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#define A (1, (2, (3, (4, <a href="nil.html">BOOST_PP_NIL</a>))))
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#define B (A, (A, (A, (A, <a href="nil.html">BOOST_PP_NIL</a>))))
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#define OP_T(d, data, x) <a href="inc.html">BOOST_PP_INC</a>(x)
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#define OP(d, state, x) (<a href="list_transform_d.html">BOOST_PP_LIST_TRANSFORM_D</a>(d, OP_T, 2, x), state)
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<a href="list_fold_right.html">BOOST_PP_LIST_FOLD_RIGHT</a>(OP, <a href="nil.html">BOOST_PP_NIL</a>, B)
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/*
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expands to:
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((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
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((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
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<a href="nil.html">BOOST_PP_NIL</a>))))
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*/
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</pre></div>
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<hr size="1">
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<div style="margin-left: 0px;">
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<i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i>© Copyright Paul Mensonides 2002</i>
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</div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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</div>
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</body>
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</html>
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