1<html> 2<head> 3 <title>BOOST_PP_LIST_TRANSFORM_D</title> 4 <link rel="stylesheet" type="text/css" href="../styles.css"> 5</head> 6<body> 7 <div style="margin-left: 0px;"> 8 The <b>BOOST_PP_LIST_TRANSFORM_D</b> macro transforms each element in a <i>list</i> according to a supplied transformation. 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>). 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>. 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>. 39 It builds a new <i>list</i> out of the results of each call. 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> <a href="../headers/list/transform.html"><boost/preprocessor/list/transform.hpp></a> 53 </div> 54 <h4>Sample Code</h4> 55<div><pre> 56#include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>> 57#include <<a href="../headers/list/fold_right.html">boost/preprocessor/list/fold_right.hpp</a>> 58#include <<a href="../headers/list/transform.html">boost/preprocessor/list/transform.hpp</a>> 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> 74 <hr size="1"> 75 <div style="margin-left: 0px;"> 76 <i>� Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> 77 </br><i>� Copyright Paul Mensonides 2002</i> 78 </div> 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> 84 </div> 85</body> 86</html> 87