ceph/src/boost/libs/preprocessor/doc/ref/list_transform_d.html

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   3         <title>BOOST_PP_LIST_TRANSFORM_D</title>
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   8                 The <b>BOOST_PP_LIST_TRANSFORM_D</b> macro transforms each element in a <i>list</i> according to a supplied transformation.&nbsp;
   9                 It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
  10         </div>
  11         <h4>Usage</h4>
  12                 <div class="code">
  13                         <b>BOOST_PP_LIST_TRANSFORM_D</b>(<i>d</i>, <i>op</i>, <i>data</i>, <i>list</i>)
  14                 </div>
  15         <h4>Arguments</h4>
  16                 <dl>
  17                         <dt>d</dt>
  18                         <dd>
  19                                 The next available <b>BOOST_PP_WHILE</b> iteration.
  20                         </dd>
  21                         <dt>op</dt>
  22                         <dd>
  23                                 A ternary predicate of the form <i>op</i>(<i>d</i>, <i>data</i>, <i>elem</i>).&nbsp;
  24                                 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,
  25                                 the auxiliary <i>data</i>, and the current element in <i>list</i>.&nbsp;
  26                         </dd>
  27                         <dt>data</dt>
  28                         <dd>
  29                                 Auxiliary data passed to <i>pred</i>.
  30                         </dd>
  31                         <dt>list</dt>
  32                         <dd>
  33                                 The <i>list</i> to be transformed.
  34                         </dd>
  35                 </dl>
  36         <h4>Remarks</h4>
  37                 <div>
  38                         This macro expands <i>op</i> for each element in <i>list</i>.&nbsp;
  39                         It builds a new <i>list</i> out of the results of each call.&nbsp;
  40                         If, for example, <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))),
  41                         this macro expands to...
  42                         <div>
  43                                 (<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>)))
  44                         </div>
  45                 </div>
  46         <h4>See Also</h4>
  47                 <ul>
  48                         <li><a href="list_transform.html">BOOST_PP_LIST_TRANSFORM</a></li>
  49                 </ul>
  50         <h4>Requirements</h4>
  51                 <div>
  52                         <b>Header:</b> &nbsp;<a href="../headers/list/transform.html">&lt;boost/preprocessor/list/transform.hpp&gt;</a>
  53                 </div>
  54         <h4>Sample Code</h4>
  55 <div><pre>
  56 #include &lt;<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>&gt;
  57 #include &lt;<a href="../headers/list/fold_right.html">boost/preprocessor/list/fold_right.hpp</a>&gt;
  58 #include &lt;<a href="../headers/list/transform.html">boost/preprocessor/list/transform.hpp</a>&gt;
  59
  60 #define A (1, (2, (3, (4, <a href="nil.html">BOOST_PP_NIL</a>))))
  61 #define B (A, (A, (A, (A, <a href="nil.html">BOOST_PP_NIL</a>))))
  62
  63 #define OP_T(d, data, x) <a href="inc.html">BOOST_PP_INC</a>(x)
  64 #define OP(d, state, x) (<a href="list_transform_d.html">BOOST_PP_LIST_TRANSFORM_D</a>(d, OP_T, 2, x), state)
  65
  66 <a href="list_fold_right.html">BOOST_PP_LIST_FOLD_RIGHT</a>(OP, <a href="nil.html">BOOST_PP_NIL</a>, B)
  67 /*
  68    expands to:
  69    ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
  70    ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
  71    <a href="nil.html">BOOST_PP_NIL</a>))))
  72 */
  73 </pre></div>
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  76                 <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  77                 </br><i>© Copyright Paul Mensonides 2002</i>
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  79         <div style="margin-left: 0px;">
  80                 <p><small>Distributed under the Boost Software License, Version 1.0. (See
  81                 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  82                 copy at <a href=
  83                 "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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