seq_fold_right.html 2.8 KB

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  1. <html>
  2. <head>
  3. <title>BOOST_PP_SEQ_FOLD_RIGHT</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_SEQ_FOLD_RIGHT</b> macro folds (or accumulates) the elements of
  9. a <i>seq</i> right-to-left.
  10. </div>
  11. <h4>
  12. Usage
  13. </h4>
  14. <div class="code">
  15. <b>BOOST_PP_SEQ_FOLD_RIGHT</b>(<i>op</i>, <i>state</i>, <i>seq</i>)
  16. </div>
  17. <h4>
  18. Arguments
  19. </h4>
  20. <dl>
  21. <dt>op</dt>
  22. <dd>
  23. A ternary operation of the form <i>op</i>(<i>s</i>, <i>state</i>, <i>elem</i>).&nbsp;
  24. This macro is called for each element in <i>seq</i>--each time returning a new <i>state</i>.&nbsp;
  25. This operation is expanded by <b>BOOST_PP_SEQ_FOLD_RIGHT</b> with the next
  26. available fold step, the current <i>state</i>, and the current element.
  27. </dd>
  28. <dt>state</dt>
  29. <dd>
  30. The initial state of the fold.
  31. </dd>
  32. <dt>seq</dt>
  33. <dd>
  34. The <i>seq</i> to be folded.
  35. </dd>
  36. </dl>
  37. <h4>
  38. Remarks
  39. </h4>
  40. <div>
  41. For the <i>seq</i>, (<i>0</i>)(<i>1</i>)(<i>2</i>), this macro expands to:
  42. <div>
  43. <i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>state</i>, <i>2</i>),
  44. <i>1</i>), <i>0</i>)
  45. </div>
  46. </div>
  47. <div>
  48. For maximum efficiency, <b>BOOST_PP_SEQ_FOLD_RIGHT</b> can be reentered with <b>BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></b>.
  49. </div>
  50. <h4>
  51. See Also
  52. </h4>
  53. <ul>
  54. <li>
  55. <a href="seq_fold_right_s.html">BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></a></li>
  56. </ul>
  57. <h4>
  58. Requirements
  59. </h4>
  60. <div>
  61. <b>Header:</b> &nbsp;<a href="../headers/seq/fold_right.html">&lt;boost/preprocessor/seq/fold_right.hpp&gt;</a>
  62. </div>
  63. <h4>
  64. Sample Code
  65. </h4>
  66. <div>
  67. <pre>
  68. #include &lt;<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>&gt;
  69. #include &lt;<a href="../headers/seq/elem.html">boost/preprocessor/seq/elem.hpp</a>&gt;
  70. #include &lt;<a href="../headers/seq/fold_right.html">boost/preprocessor/seq/fold_right.hpp</a>&gt;
  71. #include &lt;<a href="../headers/seq/pop_back.html">boost/preprocessor/seq/pop_back.hpp</a>&gt;
  72. #define SEQ (t)(s)(o)(o)(b)
  73. #define OP(s, state, x) <a href="cat.html">BOOST_PP_CAT</a>(state, x)
  74. <a href="seq_fold_right.html">BOOST_PP_SEQ_FOLD_RIGHT</a>(OP, <a href="seq_elem.html">BOOST_PP_SEQ_ELEM</a>(4, SEQ), <a href="seq_pop_back.html">BOOST_PP_SEQ_POP_BACK</a>(SEQ)) // expands to boost
  75. </pre>
  76. </div>
  77. <hr size="1">
  78. <div style="margin-left: 0px;">
  79. <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  80. </br><i>© Copyright Paul Mensonides 2002</i>
  81. </div>
  82. <div style="margin-left: 0px;">
  83. <p><small>Distributed under the Boost Software License, Version 1.0. (See
  84. accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  85. copy at <a href=
  86. "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
  87. </div>
  88. </body>
  89. </html>