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[SVN r15693]
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Paul Mensonides
2002-10-03 22:13:37 +00:00
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commit 4bb690a819
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<html>
<head>
<title>BOOST_PP_LIST_IS_NIL</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_LIST_IS_NIL</b> macro is a predicate that determines if a <i>list</i> is nil.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_LIST_IS_NIL</b>(<i>list</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>list</dt>
<dd>
A <i>list</i>.
</dd>
</dl>
<h4>Remarks</h4>
<div>
If <i>list</i> is nil, this macro expands to <i>1</i>.&nbsp;
Otherwise, it expands to <i>0</i>.
</div>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/list/adt.hpp.html">&lt;boost/preprocessor/list/adt.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/list/adt.hpp.html">boost/preprocessor/list/adt.hpp</a>&gt;
#define LIST (a, <a href="nil.html">BOOST_PP_NIL</a>)
<a href="list_is_nil.html">BOOST_PP_LIST_IS_NIL</a>(LIST) // expands to 0
<a href="list_is_nil.html">BOOST_PP_LIST_IS_NIL</a>(<a href="list_rest.html">BOOST_PP_LIST_REST</a>(LIST)) // expands to 1
</pre></div>
</body>
</html>