list_for_each_r.html 3.0 KB

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  1. <html>
  2. <head>
  3. <title>BOOST_PP_LIST_FOR_EACH_R</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_FOR_EACH_R</b> macro repeats a macro for each element in a <i>list</i>.&nbsp;
  9. It reenters <b>BOOST_PP_FOR</b> with maximum efficiency.
  10. </div>
  11. <h4>Usage</h4>
  12. <div class="code">
  13. <b>BOOST_PP_LIST_FOR_EACH_R</b>(<i>r</i>, <i>macro</i>, <i>data</i>, <i>list</i>)
  14. </div>
  15. <h4>Arguments</h4>
  16. <dl>
  17. <dt>r</dt>
  18. <dd>
  19. The next available <b>BOOST_PP_FOR</b> repetition.
  20. </dd>
  21. <dt>macro</dt>
  22. <dd>
  23. A ternary macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>elem</i>).&nbsp;
  24. This macro is expanded by <b>BOOST_PP_LIST_FOR_EACH</b> with each element in <i>list</i>.&nbsp;
  25. It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the auxiliary <i>data</i>, and the current element.
  26. </dd>
  27. <dt>data</dt>
  28. <dd>
  29. Auxiliary data passed to <i>macro</i>.
  30. </dd>
  31. <dt>list</dt>
  32. <dd>
  33. The <i>list</i> for which <i>macro</i> will be invoked on each element.
  34. </dd>
  35. </dl>
  36. <h4>Remarks</h4>
  37. <div>
  38. This macro is a repetition construct.&nbsp;
  39. If <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))), it expands to the sequence:
  40. <div>
  41. <i>macro</i>(<i>r</i>, <i>data</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>c</i>)
  42. </div>
  43. </div>
  44. <h4>See Also</h4>
  45. <ul>
  46. <li><a href="list_for_each.html">BOOST_PP_LIST_FOR_EACH</a></li>
  47. </ul>
  48. <h4>Requirements</h4>
  49. <div>
  50. <b>Header:</b> &nbsp;<a href="../headers/list/for_each.html">&lt;boost/preprocessor/list/for_each.hpp&gt;</a>
  51. </div>
  52. <h4>Sample Code</h4>
  53. <div><pre>
  54. #include &lt;<a href="../headers/list/adt.html">boost/preprocessor/list/adt.hpp</a>&gt;
  55. #include &lt;<a href="../headers/list/for_each.html">boost/preprocessor/list/for_each.hpp</a>&gt;
  56. #include &lt;<a href="../headers/repetition/for.html">boost/preprocessor/repetition/for.hpp</a>&gt;
  57. #define LIST (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>)))
  58. #define MACRO_2(r, data, elem) elem
  59. #define PRED(r, state) <a href="list_is_cons.html">BOOST_PP_LIST_IS_CONS</a>(state)
  60. #define OP(r, state) <a href="list_rest.html">BOOST_PP_LIST_REST</a>(state)
  61. #define MACRO(r, state) [ <a href="list_for_each_r.html">BOOST_PP_LIST_FOR_EACH_R</a>(r, MACRO_2, _, state) ]
  62. <a href="for.html">BOOST_PP_FOR</a>(LIST, PRED, OP, MACRO)
  63. // expands to [x y z] [y z] [z]
  64. </pre></div>
  65. <hr size="1">
  66. <div style="margin-left: 0px;">
  67. <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  68. </br><i>© Copyright Paul Mensonides 2002</i>
  69. </div>
  70. <div style="margin-left: 0px;">
  71. <p><small>Distributed under the Boost Software License, Version 1.0. (See
  72. accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  73. copy at <a href=
  74. "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
  75. </div>
  76. </body>
  77. </html>