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 <div style="margin-left: 0px;"> <i>� Copyright <a href="http://www.housemarque.com" 54 target="_top">Housemarque Oy</a> 2002</i> <br> 55 <i>� Copyright Paul Mensonides 2002</i> </div> 56 <div style="margin-left: 0px;"> 57 <p><small>Distributed under the Boost Software License, Version 1.0. (See 58 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> 59 or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 60 </div> 61 </body> 62</html> 63