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Updated docs for the the fact that in C++20 mode when __VA_OPT__ is supported variadic data passed some of the variadic macros can be empty.

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Edward Diener
2020-06-30 14:50:47 -04:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>BOOST_PP_VARIADIC_SIZE</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_SIZE</b> variadic macro
expands to the size of the <i>variadic data </i>passed to it. </div>
<h4>Usage</h4>
<div class="code"> <b>BOOST_PP_VARIADIC_SIZE</b>(<i>...</i>) <a href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br>
</div>
<h4>Arguments</h4>
<dl>
<dt>...<br>
</dt>
<dd>&nbsp; <i>Variadic data </i>whose size is to be extracted. </dd>
</dl>
<h4>Requirements</h4>
<div> <b>Header:</b> &nbsp;<a href="../headers/variadic/size.html">&lt;boost/preprocessor/variadic/size.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div>
<pre>#include &lt;<a href="../headers/variadic/size.html">boost/preprocessor/variadic/size.hpp</a>&gt;<br><br>#define VAR_DATA x, y, z<br><br><a href="variadic_size.html">BOOST_PP_VARIADIC_SIZE</a>(VAR_DATA) // expands to 3<br></pre>
</div>
<hr size="1">
<div style="margin-left: 0px;"> <i></i><i><EFBFBD> Copyright Edward Diener 2011,2013</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>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252">
<title>BOOST_PP_VARIADIC_SIZE</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_SIZE</b>
variadic macro
expands to the size of the <i>variadic data </i>passed to it. </div>
<h4>Usage</h4>
<div class="code"> <b>BOOST_PP_VARIADIC_SIZE</b>(<i>...</i>) <a
href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br>
</div>
<h4>Arguments</h4>
<dl>
<dt>...<br>
</dt>
<dd>&nbsp; <i>Variadic data </i>whose size is to be extracted.</dd>
</dl>
<h4>Remarks</h4>
<p>&nbsp;&nbsp;&nbsp; In <a
href="../topics/variadic_macros.html#C20_Support_For_Variadic_Macros">C++
20</a> mode the <i>variadic</i> <i>data</i> can be empty and
the result will be 0.<br>
</p>
<h4>Requirements</h4>
<div> <b>Header:</b> &nbsp;<a href="../headers/variadic/size.html">&lt;boost/preprocessor/variadic/size.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div>
<pre>#include &lt;<a href="../headers/variadic/size.html">boost/preprocessor/variadic/size.hpp</a>&gt;<br><br>#define VAR_DATA x, y, z<br><br><a href="variadic_size.html">BOOST_PP_VARIADIC_SIZE</a>(VAR_DATA) // expands to 3<br></pre>
</div>
<hr size="1">
<div style="margin-left: 0px;"> <i></i><i><EFBFBD> Copyright Edward Diener
2011,2013</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>