projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <meta content="text/html; charset=windows-1252" http-equiv="content-type"> | |
| 4 | <title>BOOST_PP_LIST_TO_TUPLE_R</title> | |
| 5 | <link rel="stylesheet" type="text/css" href="../styles.css"> | |
| 6 | </head> | |
| 7 | <body> | |
| 8 | <div style="margin-left: 0px;"> The <b>BOOST_PP_LIST_TO_TUPLE_R</b> macro | |
| 9 | converts a <i>list</i> to a <i>tuple</i>. It reenters <b>BOOST_PP_FOR</b> | |
| 10 | with maximum efficiency. </div> | |
| 11 | <h4>Usage</h4> | |
| 12 | <div class="code"> <b>BOOST_PP_LIST_TO_TUPLE_R</b>(<i>r</i>, <i>list</i>) | |
| 13 | </div> | |
| 14 | <h4>Arguments</h4> | |
| 15 | <dl> | |
| 16 | <dt>r</dt> | |
| 17 | <dd> The next available <b>BOOST_PP_FOR</b> repetition. </dd> | |
| 18 | <dt>list</dt> | |
| 19 | <dd> The <i>list</i> to be converted. </dd> | |
| 20 | </dl> | |
| 21 | <h4>Remarks</h4> | |
| 22 | <p> If <i>list</i> is, for example, (<i>a</i>, (<i>b</i>, (<i>c</i>, | |
| 23 | <b>BOOST_PP_NIL</b>))), this macro will produce: </p> | |
| 24 | <div> | |
| 25 | <div> (<i>a</i>, <i>b</i>, <i>c</i>) </div> | |
| 26 | </div> | |
| 27 | <h4><span style="font-weight: normal;"> If the <i>list</i> to | |
| 28 | be converted is empty, as represented by 'BOOST_PP_NIL', the resulting <i>tuple</i> | |
| 29 | is undefined since a <i>tuple</i> cannot be empty. </span></h4> | |
| 30 | <h4>See Also</h4> | |
| 31 | <ul> | |
| 32 | <li><a href="list_to_tuple.html">BOOST_PP_LIST_TO_TUPLE</a></li> | |
| 33 | </ul> | |
| 34 | <h4>Requirements</h4> | |
| 35 | <div> <b>Header:</b> <a href="../headers/list/to_tuple.html"><boost/preprocessor/list/to_tuple.hpp></a> | |
| 36 | </div> | |
| 37 | <h4>Sample Code</h4> | |
| 38 | <div> | |
| 39 | <pre>#include <<a href="../headers/list/adt.html">boost/preprocessor/list/adt.hpp</a>> | |
| 40 | #include <<a href="../headers/list/to_tuple.html">boost/preprocessor/list/to_tuple.hpp</a>> | |
| 41 | #include <<a href="../headers/repetition/for.html">boost/preprocessor/repetition/for.hpp</a>> | |
| 42 | ||
| 43 | #define LIST (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>))) | |
| 44 | ||
| 45 | #define PRED(r, state) <a href="list_is_cons.html">BOOST_PP_LIST_IS_CONS</a>(state) | |
| 46 | #define OP(r, state) <a href="list_rest.html">BOOST_PP_LIST_REST</a>(state) | |
| 47 | #define MACRO(r, state) <a href="list_to_tuple_r.html">BOOST_PP_LIST_TO_TUPLE_R</a>(r, state) | |
| 48 | ||
| 49 | <a href="for.html">BOOST_PP_FOR</a>(LIST, PRED, OP, MACRO) | |
| 50 | // expands to (x, y, z) (y, z) (z) | |
| 51 | </pre></div> | |
| 52 | <hr size="1"> | |
| 53 |