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Documentation for variadic opt functionality.

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Edward Diener
2019-09-25 15:43:07 -04:00
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<html>
<head>
<title>BOOST_PP_VARIADIC_OPT</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_OPT</b> macro
determines whether or not the C++20 __VA_OPT__ construct is supported for the compiler's preprocessor being used.
Expands to 1 if the __VA_OPT__ construct is supported, otherwise expands to 0.
</div>
<h4>Usage</h4>
<div class="code"> <b>BOOST_PP_VARIADIC_OPT</b>() <br>
</div>
<h4>Arguments</h4>
<dl>
<dt>None<br>
</dt>
</dl>
<h4>Requirements</h4>
<div> <b>Header:</b> &nbsp;<a href="../headers/variadic/opt.html">&lt;boost/preprocessor/variadic/opt.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div>
<pre>
#include &lt;<a href="../headers/variadic/opt.html">boost/preprocessor/variadic/opt.hpp</a>&gt;<br>
#if <a href="variadic_opt.html">BOOST_PP_VARIADIC_OPT</a>()<br>
// Preprocessor code which uses __VA_OPT__<br>
#else<br>
// Preprocessor code which does not use __VA_OPT__<br>
#endif<br>
</pre>
</div>
<hr size="1">
<div style="margin-left: 0px;"> <i></i><i><EFBFBD> Copyright Edward Diener 2019</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>