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Library/boost/libs/preprocessor/doc/ref/repeat.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> <title>BOOST_PP_REPEAT</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_REPEAT</b> macro represents a fast horizontal repetition construct. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_REPEAT</b>(<i>count</i>, <i>macro</i>, <i>data</i>) </div> <h4>Arguments</h4> <dl> <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> The <i>z</i> value that is passed to <i>macro</i> represents the next available repetition dimension. 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>. 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. </div> <div> To directly use this <i>z</i> value, rather than simply passing it to another macro, see <b>BOOST_PP_REPEAT_<i>z</i></b>. </div> <div> Previously, this macro could not be used recursively inside <b>BOOST_PP_REPEAT</b>. This limitation no longer exists, as the library can automatically detect the next available repetition depth. </div> <h4>See Also</h4> <ul> <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li> <li><a href="repeat_z.html">BOOST_PP_REPEAT_<i>z</i></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/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>> #define DECL(z, n, text) text ## n = n; <a href="repeat.html">BOOST_PP_REPEAT</a>(5, DECL, int x) </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</i> </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>