projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_SEQ_FOR_EACH_I</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_FOR_EACH_I</b> macro repeats a macro for each element in a <i>seq</i>. | |
| 9 | </div> | |
| 10 | <h4> | |
| 11 | Usage | |
| 12 | </h4> | |
| 13 | <div class="code"> | |
| 14 | <b>BOOST_PP_SEQ_FOR_EACH_I</b>(<i>macro</i>, <i>data</i>, <i>seq</i>) | |
| 15 | </div> | |
| 16 | <h4> | |
| 17 | Arguments | |
| 18 | </h4> | |
| 19 | <dl> | |
| 20 | <dt>macro</dt> | |
| 21 | <dd> | |
| 22 | A macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>i</i>, <i>elem</i>). | |
| 23 | This macro is expanded by <b>BOOST_PP_SEQ_FOR_EACH_I</b> with each element in <i>seq</i>. | |
| 24 | It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the | |
| 25 | auxiliary <i>data</i>, the index of the current element, and the current | |
| 26 | element. | |
| 27 | </dd> | |
| 28 | <dt>data</dt> | |
| 29 | <dd> | |
| 30 | Auxiliary data passed to <i>macro</i>. | |
| 31 | </dd> | |
| 32 | <dt>seq</dt> | |
| 33 | <dd> | |
| 34 | The <i>seq</i> for which <i>macro</i> will be invoked on each element. | |
| 35 | </dd> | |
| 36 | </dl> | |
| 37 | <h4> | |
| 38 | Remarks | |
| 39 | </h4> | |
| 40 | <div> | |
| 41 | This macro is a repetition construct. If <i>seq</i> is (<i>a</i>)(<i>b</i>)(<i>c</i>), | |
| 42 | it expands to the sequence: | |
| 43 | <div> | |
| 44 | <i>macro</i>(<i>r</i>, <i>data</i>, <i>0</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>, | |
| 45 | <i>1</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>2</i>, <i>c</i>) | |
| 46 | </div> | |
| 47 | </div> | |
| 48 | <div> | |
| 49 | For maximum efficiency, use <b>BOOST_PP_SEQ_FOR_EACH_I_R</a></li> | |
| 50 | </div> | |
| 51 | <h4> | |
| 52 | See Also | |
| 53 | </h4> | |
| 54 | <ul> | |
| 55 | <li> | |
| 56 | <a href="seq_for_each_i_r.html">BOOST_PP_SEQ_FOR_EACH_I_R</a></li> | |
| 57 | </ul> | |
| 58 | <h4> | |
| 59 | Requirements | |
| 60 | </h4> | |
| 61 | <div> | |
| 62 | <b>Header:</b> <a href="../headers/seq/for_each_i.html"><boost/preprocessor/seq/for_each_i.hpp></a> | |
| 63 | </div> | |
| 64 | <h4> | |
| 65 | Sample Code | |
| 66 | </h4> | |
| 67 | <div> | |
| 68 | <pre> | |
| 69 | #include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>> | |
| 70 | #include <<a href="../headers/seq/for_each_i.html">boost/preprocessor/seq/for_each_i.hpp</a>> | |
| 71 | ||
| 72 | #define SEQ (a)(b)(c)(d) | |
| 73 | ||
| 74 | #define MACRO(r, data, i, elem) <a href="cat.html">BOOST_PP_CAT</a>(elem, <a href="cat.html">BOOST_PP_CAT</a>(data, i)) | |
| 75 | ||
| 76 | <a href="seq_for_each_i.html">BOOST_PP_SEQ_FOR_EACH_I</a>(MACRO, _, SEQ) // expands to a_0 b_1 c_2 d_3 | |
| 77 | </pre> | |
| 78 | </div> | |
| 79 | <hr size="1"> | |
| 80 | <div style="margin-left: 0px;"> | |
| 81 |