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Library/boost/libs/preprocessor/doc/ref/expr_if.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_EXPR_IF</title> <link rel="stylesheet" type="text/css" href="../styles.css"> </head> <body> <div style="margin-left: 0px;"> The <b>BOOST_PP_EXPR_IF</b> macro expands to its second argument if its first argument is non-zero or expands to nothing otherwise. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_EXPR_IF</b>(<i>cond</i>, <i>expr</i>) </div> <h4>Arguments</h4> <dl> <dt>cond</dt> <dd> The condition that determines if the result is <i>expr</i> or nothing. Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. </dd> <dt>expr</dt> <dd> The result of the expansion if <i>cond</i> is non-zero. </dd> </dl> <h4>Remarks</h4> <div> This macro performs a boolean conversion on its first argument. If that conversion is unnecessary, use <b>BOOST_PP_EXPR_IIF</b> instead. </div> <h4>See Also</h4> <ul> <li><a href="expr_iif.html">BOOST_PP_EXPR_IIF</a></li> <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li> </ul> <h4>Requirements</h4> <div> <b>Header:</b> <a href="../headers/control/expr_if.html"><boost/preprocessor/control/expr_if.hpp></a> </div> <h4>Sample Code</h4> <div><pre> #include <<a href="../headers/control/expr_if.html">boost/preprocessor/control/expr_if.hpp</a>> #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>> #define CV(n) \ <a href="expr_if.html">BOOST_PP_EXPR_IF</a>( \ n, \ <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>( \ 4, n, \ (..., const, volatile, const volatile) \ ) \ ) \ /**/ CV(0) // expands to nothing CV(1) // expands to const </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>