1<html> 2 <head> 3 <meta content="text/html; charset=windows-1252" http-equiv="content-type"> 4 <title>BOOST_PP_REPEAT_z</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_REPEAT_<i>z</i></b> macro 9 represents a reentry into the <b>BOOST_PP_REPEAT</b> repetition 10 construct. </div> 11 <h4>Usage</h4> 12 <div class="code"> <b>BOOST_PP_REPEAT_</b> ## <i>z</i>(<i>count</i>, <i>macro</i>, 13 <i>data</i>) </div> 14 <h4>Arguments</h4> 15 <dl> 16 <dt>z</dt> 17 <dd> The next available <b>BOOST_PP_REPEAT</b> dimension. </dd> 18 <dt>count</dt> 19 <dd> The number of repetitious calls to <i>macro</i>. Valid values 20 range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>. </dd> 21 <dt>macro</dt> 22 <dd> A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>). 23 This macro is expanded by <b>BOOST_PP_REPEAT</b> with the next 24 available repetition depth, the current repetition number, and the 25 auxiliary <i>data</i> argument. </dd> 26 <dt>data</dt> 27 <dd> Auxiliary data passed to <i>macro</i>. </dd> 28 </dl> 29 <h4>Remarks</h4> 30 <div> This macro expands to the sequence: 31 <div> <i>macro</i>(<i>z</i>, <i>0</i>, <i>data</i>) <i>macro</i>(<i>z</i>, 32 <i>1</i>, <i>data</i>) ... <i>macro</i>(<i>z</i>, <i>count</i> - <i>1</i>, 33 <i>data</i>) </div> 34 </div> 35 <div> At certain times, it may be necessary to perform the concatenation 36 with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting 37 operator. This happens when the <i>z</i> value is a macro 38 invocation itself. It needs a delay to allow it to expand. The 39 syntax in such a scenario becomes: 40 <div> <b>BOOST_PP_CAT</b>(<b>BOOST_PP_REPEAT_</b>, <i>z</i>)(<i>count</i>, 41 <i>macro</i>, <i>data</i>) </div> 42 </div> 43 <h4>See Also</h4> 44 <ul> 45 <li><a href="cat.html">BOOST_PP_CAT</a></li> 46 <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li> 47 <li><a href="repeat.html">BOOST_PP_REPEAT</a></li> 48 <li><a href="repeat_z_macros.html"><span style="color: gray;">Macros with 49 Z re-entrancy forms</span></a></li> 50 </ul> 51 <h4>Requirements</h4> 52 <div> <b>Header:</b> <a href="../headers/repetition/repeat.html"><boost/preprocessor/repetition/repeat.hpp></a> 53 </div> 54 <h4>Sample Code</h4> 55 <div> 56 <pre>#include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>> 57#include <<a href="../headers/punctuation/comma_if.html">boost/preprocessor/punctuation/comma_if.hpp</a>> 58#include <<a href="../headers/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>> 59 60#define TEXT(z, n, text) <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) text 61 62#define TEMPLATE(z, n, _) \ 63 <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) \ 64 template< \ 65 <a href="repeat_z.html">BOOST_PP_REPEAT_</a> ## z( \ 66 <a href="inc.html">BOOST_PP_INC</a>(n), \ 67 TEXT, class \ 68 ) \ 69 > class T ## n \ 70 /**/ 71 72<a href="repeat.html">BOOST_PP_REPEAT</a>(3, TEMPLATE, nil) 73 /* 74 expands to: 75 template<class> class T0, 76 template<class, class> class T1, 77 template<class, class, class> class T2 78 */ 79</pre></div> 80 <hr size="1"> 81 <div style="margin-left: 0px;"> <i>� Copyright <a href="http://www.housemarque.com" 82 target="_top">Housemarque Oy</a> 2002</i> <br> 83 <i>� Copyright Paul Mensonides 2002<br> 84 </i><i>� Copyright Edward Diener 2014</i><br> 85 </div> 86 <div style="margin-left: 0px;"> 87 <p><small>Distributed under the Boost Software License, Version 1.0. (See 88 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> 89 or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 90 </div> 91 </body> 92</html> 93