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[SVN r15198]
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Paul Mensonides
2002-09-08 09:40:56 +00:00
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commit cdc4be5256
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<html>
<head>
<title>BOOST_PP_APPLY</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
<script language="javascript" type="text/javascript" src="../scripts.js"></script>
</head>
<body onload="init('sample');">
<div style="margin-left: 0px;">
The <b>BOOST_PP_APPLY</b> macro abstracts the difference between an argument and nothing.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_APPLY</b>(<i>x</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>x</dt>
<dd>
The abstracted argument.&nbsp;
This argument must be either <b>BOOST_PP_NIL</b> or a <i>tuple</i> with one element--such as <i>(arg)</i> or <i>((a, b))</i>.
</dd>
</dl>
<h4>Remarks</h4>
<div>
If <i>x</i> is <b>BOOST_PP_NIL</b>, this macro expands to nothing.&nbsp;
If <i>x</i> is a one element <i>tuple</i>, it expands to the contents of that <i>tuple</i>.
</div>
<h4>See Also</h4>
<ul>
<li><a href="nil.html">BOOST_PP_NIL</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/facilities/apply.hpp.html">&lt;boost/preprocessor/facilities/apply.hpp&gt;</a>
</div>
<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
<div id="sample"><pre>
#include &lt;boost/preprocessor/facilities/apply.hpp&gt;
#include &lt;boost/preprocessor/tuple/elem.hpp&gt;
#define CV(i) /* .......................................... */ \
BOOST_PP_APPLY( \
BOOST_PP_TUPLE_ELEM( \
4, i, \
(BOOST_PP_NIL, (const), (volatile), (const volatile)) \
) \
) \
/**/
CV(0) // expands to nothing
CV(1) // expands to const
<pre></div>
</body>
</html>