ceph/src/boost/libs/preprocessor/doc/ref/list_for_each_r.html

   1 <html>
   2 <head>
   3         <title>BOOST_PP_LIST_FOR_EACH_R</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_LIST_FOR_EACH_R</b> macro repeats a macro for each element in a <i>list</i>.&nbsp;
   9                 It reenters <b>BOOST_PP_FOR</b> with maximum efficiency.
  10         </div>
  11         <h4>Usage</h4>
  12                 <div class="code">
  13                         <b>BOOST_PP_LIST_FOR_EACH_R</b>(<i>r</i>, <i>macro</i>, <i>data</i>, <i>list</i>)
  14                 </div>
  15         <h4>Arguments</h4>
  16                 <dl>
  17                         <dt>r</dt>
  18                         <dd>
  19                                 The next available <b>BOOST_PP_FOR</b> repetition.
  20                         </dd>
  21                         <dt>macro</dt>
  22                         <dd>
  23                                 A ternary macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>elem</i>).&nbsp;
  24                                 This macro is expanded by <b>BOOST_PP_LIST_FOR_EACH</b> with each element in <i>list</i>.&nbsp;
  25                                 It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the auxiliary <i>data</i>, and the current element.
  26                         </dd>
  27                         <dt>data</dt>
  28                         <dd>
  29                                 Auxiliary data passed to <i>macro</i>.
  30                         </dd>
  31                         <dt>list</dt>
  32                         <dd>
  33                                 The <i>list</i> for which <i>macro</i> will be invoked on each element.
  34                         </dd>
  35                 </dl>
  36         <h4>Remarks</h4>
  37                 <div>
  38                         This macro is a repetition construct.&nbsp;
  39                         If <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))), it expands to the sequence:
  40                         <div>
  41                                 <i>macro</i>(<i>r</i>, <i>data</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>c</i>)
  42                         </div>
  43                 </div>
  44         <h4>See Also</h4>
  45                 <ul>
  46                         <li><a href="list_for_each.html">BOOST_PP_LIST_FOR_EACH</a></li>
  47                 </ul>
  48         <h4>Requirements</h4>
  49                 <div>
  50                         <b>Header:</b> &nbsp;<a href="../headers/list/for_each.html">&lt;boost/preprocessor/list/for_each.hpp&gt;</a>
  51                 </div>
  52         <h4>Sample Code</h4>
  53 <div><pre>
  54 #include &lt;<a href="../headers/list/adt.html">boost/preprocessor/list/adt.hpp</a>&gt;
  55 #include &lt;<a href="../headers/list/for_each.html">boost/preprocessor/list/for_each.hpp</a>&gt;
  56 #include &lt;<a href="../headers/repetition/for.html">boost/preprocessor/repetition/for.hpp</a>&gt;
  57
  58 #define LIST (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>)))
  59
  60 #define MACRO_2(r, data, elem) elem
  61
  62 #define PRED(r, state) <a href="list_is_cons.html">BOOST_PP_LIST_IS_CONS</a>(state)
  63 #define OP(r, state) <a href="list_rest.html">BOOST_PP_LIST_REST</a>(state)
  64 #define MACRO(r, state) [ <a href="list_for_each_r.html">BOOST_PP_LIST_FOR_EACH_R</a>(r, MACRO_2, _, state) ]
  65
  66 <a href="for.html">BOOST_PP_FOR</a>(LIST, PRED, OP, MACRO)
  67    // expands to [x y z] [y z] [z]
  68 </pre></div>
  69         <hr size="1">
  70         <div style="margin-left: 0px;">
  71                 <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  72                 </br><i>© Copyright Paul Mensonides 2002</i>
  73         </div>
  74         <div style="margin-left: 0px;">
  75                 <p><small>Distributed under the Boost Software License, Version 1.0. (See
  76                 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  77                 copy at <a href=
  78                 "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
  79         </div>
  80 </body>
  81 </html>