seq_first_n.html 1.8 KB

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  3. <title>BOOST_PP_SEQ_FIRST_N</title>
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  8. The <b>BOOST_PP_SEQ_FIRST_N</b> macro expands to a <i>seq</i> of the first <i>n</i>
  9. elements of a <i>seq</i>.
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  11. <h4>
  12. Usage
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  14. <div class="code">
  15. <b>BOOST_PP_SEQ_FIRST_N</b>(<i>n</i>, <i>seq</i>)
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  17. <h4>
  18. Arguments
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  20. <dl>
  21. <dt>n</dt>
  22. <dd>
  23. The number of elements to extract.
  24. </dd>
  25. <dt>seq</dt>
  26. <dd>
  27. The <i>seq</i> from which the elements are extracted.
  28. </dd>
  29. </dl>
  30. <h4>
  31. Remarks
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  33. <div>
  34. This macro extracts <i>n</i> elements from the beginning of <i>seq</i> and
  35. returns them as a new <i>seq</i>
  36. </div>
  37. <h4>
  38. See Also
  39. </h4>
  40. <ul>
  41. <li>
  42. <a href="seq_rest_n.html">BOOST_PP_SEQ_REST_N</a></li>
  43. </ul>
  44. <h4>
  45. Requirements
  46. </h4>
  47. <div>
  48. <b>Header:</b> &nbsp;<a href="../headers/seq/first_n.html">&lt;boost/preprocessor/seq/first_n.hpp&gt;</a>
  49. </div>
  50. <h4>
  51. Sample Code
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  53. <div>
  54. <pre>#include &lt;<a href="../headers/seq/first_n.html">boost/preprocessor/seq/first_n.hpp</a>&gt;<br><br>#define SEQ (a)(b)(c)(d)(e)<br><br><a href="seq_first_n.html">BOOST_PP_SEQ_FIRST_N</a>(2, SEQ) // expands to (a)(b)<br></pre>
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  57. <div style="margin-left: 0px;">
  58. <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  59. <br><i>© Copyright Paul Mensonides 2002</i>
  60. </div>
  61. <div style="margin-left: 0px;">
  62. <p><small>Distributed under the Boost Software License, Version 1.0. (See
  63. accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  64. copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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