list_transform_d.html 3.4 KB

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  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.&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. #define A (1, (2, (3, (4, <a href="nil.html">BOOST_PP_NIL</a>))))
  60. #define B (A, (A, (A, (A, <a href="nil.html">BOOST_PP_NIL</a>))))
  61. #define OP_T(d, data, x) <a href="inc.html">BOOST_PP_INC</a>(x)
  62. #define OP(d, state, x) (<a href="list_transform_d.html">BOOST_PP_LIST_TRANSFORM_D</a>(d, OP_T, 2, x), state)
  63. <a href="list_fold_right.html">BOOST_PP_LIST_FOLD_RIGHT</a>(OP, <a href="nil.html">BOOST_PP_NIL</a>, B)
  64. /*
  65. expands to:
  66. ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
  67. ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))), ((2, (3, (4, (5, <a href="nil.html">BOOST_PP_NIL</a>)))),
  68. <a href="nil.html">BOOST_PP_NIL</a>))))
  69. */
  70. </pre></div>
  71. <hr size="1">
  72. <div style="margin-left: 0px;">
  73. <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  74. </br><i>© Copyright Paul Mensonides 2002</i>
  75. </div>
  76. <div style="margin-left: 0px;">
  77. <p><small>Distributed under the Boost Software License, Version 1.0. (See
  78. accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  79. copy at <a href=
  80. "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
  81. </div>
  82. </body>
  83. </html>