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

   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>).&nbsp;
  23                                 This macro is expanded by <b>BOOST_PP_SEQ_FOR_EACH_I</b> with each element in <i>seq</i>.&nbsp;
  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.&nbsp; 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> &nbsp;<a href="../headers/seq/for_each_i.html">&lt;boost/preprocessor/seq/for_each_i.hpp&gt;</a>
  63                 </div>
  64                 <h4>
  65                         Sample Code
  66                 </h4>
  67                 <div>
  68                         <pre>
  69 #include &lt;<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>&gt;
  70 #include &lt;<a href="../headers/seq/for_each_i.html">boost/preprocessor/seq/for_each_i.hpp</a>&gt;
  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                 <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
  82                 </br><i>© Copyright Paul Mensonides 2002</i>
  83         </div>
  84         <div style="margin-left: 0px;">
  85                 <p><small>Distributed under the Boost Software License, Version 1.0. (See
  86                 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
  87                 copy at <a href=
  88                 "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
  89         </div>
  90         </body>
  91 </html>