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Library/boost/libs/preprocessor/doc/ref/overload.html
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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_OVERLOAD</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_OVERLOAD</b> variadic macro expands to the name of a non-variadic macro having a given number of parameters.<br> </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_OVERLOAD</b>(<i>prefix</i>,...) <a href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br> </div> <h4>Arguments</h4> <dl> <dt>prefix<br> </dt> <dd> The prefix of the non-variadic macro name. </dd> <dt>...<br> </dt> <dd><i> Variadic data</i>. The number of variadic data elements, as determined by BOOST_PP_VARIADIC_SIZE, is appended to the prefix to form the output non-variadic macro name.<br> </dd> </dl> <h4>Remarks</h4> <div> This macro creates a macro name which depends on the number of elements of variadic data. It should be used in the form of <br> BOOST_PP_OVERLOAD(MACRO_NAME_,__VA_ARGS__)(__VA_ARGS__) in order to call a non-variadic macro taking a given number of variadic data elements as non-variadic arguments. In this way one can invoke a variadic macro with a variable number of parameters which calls one of a series of non-variadic macros doing very similar things. </div> <b>Requirements</b> <div> <b>Header:</b> <a href="../headers/facilities/overload.html"><boost/preprocessor/facilities/overload.hpp></a> </div> <h4>Sample Code</h4> <div> <pre>#include <<a href="../headers/facilities/overload.html">boost/preprocessor/facilities/overload.hpp</a>><br>#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>><br>#include <<a href="../headers/facilities/empty.html">boost/preprocessor/facilities/empty.hpp</a>><br>#include <<a href="../headers/arithmetic/add.html">boost/preprocessor/arithmetic/add.hpp</a>><br><br>#define MACRO_1(number) MACRO_2(number,10)<br>#define MACRO_2(number1,number2) <a href="add.html">BOOST_PP_ADD</a>(number1,number2)<br><br>#if !BOOST_PP_VARIADICS_MSVC<br><br>#define MACRO_ADD_NUMBERS(...) <a href="overload.html">BOOST_PP_OVERLOAD</a>(MACRO_,__VA_ARGS__)(__VA_ARGS__)<br><br>#else<br><br>// or for Visual C++<br><br>#define MACRO_ADD_NUMBERS(...) \<br> <a href="cat.html">BOOST_PP_CAT</a>(<a href="overload.html">BOOST_PP_OVERLOAD</a>(MACRO_,__VA_ARGS__)(__VA_ARGS__),<a href="empty.html">BOOST_PP_EMPTY</a>())<br><br>#endif<br><br>MACRO_ADD_NUMBERS(5) // output is 15<br>MACRO_ADD_NUMBERS(3,6) // output is 9</pre> </div> <hr size="1"> <div style="margin-left: 0px;"> <i></i><i>� Copyright Edward Diener 2011,2013,2016</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>