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Library/boost/libs/preprocessor/doc/ref/repeat_z.html
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PatoFlamejanteTV
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19 дек 2024, 19:11
19 дек 2024, 19:11
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<html> <head> <meta content="text/html; charset=windows-1252" http-equiv="content-type"> <title>BOOST_PP_REPEAT_z</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_REPEAT_<i>z</i></b> macro represents a reentry into the <b>BOOST_PP_REPEAT</b> repetition construct. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_REPEAT_</b> ## <i>z</i>(<i>count</i>, <i>macro</i>, <i>data</i>) </div> <h4>Arguments</h4> <dl> <dt>z</dt> <dd> The next available <b>BOOST_PP_REPEAT</b> dimension. </dd> <dt>count</dt> <dd> The number of repetitious calls to <i>macro</i>. Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>. </dd> <dt>macro</dt> <dd> A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>). This macro is expanded by <b>BOOST_PP_REPEAT</b> with the next available repetition depth, the current repetition number, and the auxiliary <i>data</i> argument. </dd> <dt>data</dt> <dd> Auxiliary data passed to <i>macro</i>. </dd> </dl> <h4>Remarks</h4> <div> This macro expands to the sequence: <div> <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>) </div> </div> <div> At certain times, it may be necessary to perform the concatenation with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting operator. This happens when the <i>z</i> value is a macro invocation itself. It needs a delay to allow it to expand. The syntax in such a scenario becomes: <div> <b>BOOST_PP_CAT</b>(<b>BOOST_PP_REPEAT_</b>, <i>z</i>)(<i>count</i>, <i>macro</i>, <i>data</i>) </div> </div> <h4>See Also</h4> <ul> <li><a href="cat.html">BOOST_PP_CAT</a></li> <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li> <li><a href="repeat.html">BOOST_PP_REPEAT</a></li> <li><a href="repeat_z_macros.html"><span style="color: gray;">Macros with Z re-entrancy forms</span></a></li> </ul> <h4>Requirements</h4> <div> <b>Header:</b> <a href="../headers/repetition/repeat.html"><boost/preprocessor/repetition/repeat.hpp></a> </div> <h4>Sample Code</h4> <div> <pre>#include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>> #include <<a href="../headers/punctuation/comma_if.html">boost/preprocessor/punctuation/comma_if.hpp</a>> #include <<a href="../headers/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>> #define TEXT(z, n, text) <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) text #define TEMPLATE(z, n, _) \ <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) \ template< \ <a href="repeat_z.html">BOOST_PP_REPEAT_</a> ## z( \ <a href="inc.html">BOOST_PP_INC</a>(n), \ TEXT, class \ ) \ > class T ## n \ /**/ <a href="repeat.html">BOOST_PP_REPEAT</a>(3, TEMPLATE, nil) /* expands to: template<class> class T0, template<class, class> class T1, template<class, class, class> class T2 */ </pre></div> <hr size="1"> <div style="margin-left: 0px;"> <i>� Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> <br> <i>� Copyright Paul Mensonides 2002<br> </i><i>� Copyright Edward Diener 2014</i><br> </div> <div style="margin-left: 0px;"> <p><small>Distributed under the Boost Software License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> </div> </body> </html>