1<html> 2<head> 3 <title>BOOST_PP_ENUM_TRAILING</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_ENUM_TRAILING</b> macro generates a comma-separated list with a leading comma. 9 </div> 10 <h4>Usage</h4> 11 <div class="code"> 12 <b>BOOST_PP_ENUM_TRAILING</b>(<i>count</i>, <i>macro</i>, <i>data</i>) 13 </div> 14 <h4>Arguments</h4> 15 <dl> 16 <dt>count</dt> 17 <dd> 18 The number of repetitious calls to <i>macro</i>. 19 Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>. 20 </dd> 21 <dt>macro</dt> 22 <dd> 23 A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>). 24 This macro is expanded by <b>BOOST_PP_ENUM</b> with the next available repetition depth, 25 the current repetition number, and the auxiliary <i>data</i> argument. 26 </dd> 27 <dt>data</dt> 28 <dd> 29 Auxiliary data passed to <i>macro</i>. 30 </dd> 31 </dl> 32 <h4>Remarks</h4> 33 <div> 34 This macro expands to the comma-separated sequence: 35 <div> 36 , <i>macro</i>(<i>z</i>, <i>0</i>, <i>data</i>), <i>macro</i>(<i>z</i>, <i>1</i>, <i>data</i>), ... <i>macro</i>(<i>z</i>, <i>count</i> - <i>1</i>, <i>data</i>) 37 </div> 38 </div> 39 <div> 40 The <i>z</i> value that is passed to <i>macro</i> represents the next available repetition dimension. 41 Other macros that have <b>_Z</b> suffix variants internally use <b>BOOST_PP_REPEAT</b>--for example, <b>BOOST_PP_ENUM_PARAMS</b> and <b>BOOST_PP_ENUM_PARAMS_Z</b>. 42 Using these <b>_Z</b> versions is not strictly necessary, but passing the <i>z</i> value (that is passed to <i>macro</i>) to these macros allows them to reenter <b>BOOST_PP_REPEAT</b> with maximum efficiency. 43 </div> 44 <div> 45 To directly use this <i>z</i> value, rather than simply passing it to another macro, see <b>BOOST_PP_ENUM_TRAILING_<i>z</i></b>. 46 </div> 47 <h4>See Also</h4> 48 <ul> 49 <li><a href="enum_trailing_z.html">BOOST_PP_ENUM_TRAILING_<i>z</i></a></li> 50 <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li> 51 </ul> 52 <h4>Requirements</h4> 53 <div> 54 <b>Header:</b> <a href="../headers/repetition/enum_trailing.html"><boost/preprocessor/repetition/enum_trailing.hpp></a> 55 </div> 56 <h4>Sample Code</h4> 57<div><pre> 58#include <<a href="../headers/repetition/enum_trailing.html">boost/preprocessor/repetition/enum_trailing.hpp</a>> 59 60#define TEXT(z, n, text) text 61 62template<class <a href="enum_trailing.html">BOOST_PP_ENUM_TRAILING</a>(3, TEXT, class)> 63class X { }; 64/* 65 expands to... 66 67template<class, class, class, class> 68class X { }; 69*/ 70</pre></div> 71 <hr size="1"> 72 <div style="margin-left: 0px;"> 73 <i>� Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> 74 </br><i>� Copyright Paul Mensonides 2002</i> 75 </div> 76 <div style="margin-left: 0px;"> 77 <p><small>Distributed under the Boost Software License, Version 1.0. (See 78 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or 79 copy at <a href= 80 "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 81 </div> 82</body> 83</html> 84