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Paul Mensonides
2002-09-08 09:40:56 +00:00
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<html>
<head>
<title>BOOST_PP_TUPLE_EAT</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_TUPLE_EAT</b> macro expands to a macro that eats a <i>tuple</i> of the specified size.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_TUPLE_EAT</b>(<i>size</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>size</dt>
<dd>
The size of the <i>tuple</i> to be eaten.&nbsp;
Valid <i>tuple</i> sizes range from <i>0</i> to <b>BOOST_PP_LIMIT_TUPLE</b>.&nbsp;
</dd>
</dl>
<h4>Remarks</h4>
<div>
The <i>size</i> argument must be the actual size of the <i>tuple</i>.
</div>
<h4>See Also</h4>
<ul>
<li><a href="limit_tuple.html">BOOST_PP_LIMIT_TUPLE</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/tuple/eat.hpp.html">&lt;boost/preprocessor/tuple/eat.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/control/if.hpp&gt;
#include &lt;boost/preprocessor/tuple/eat.hpp&gt;
#define OP(a, b) (a b)
#define MACRO(n) BOOST_PP_IF(n, OP, BOOST_PP_TUPLE_EAT(2))(1, 2)
MACRO(0) // expands to nothing
MACRO(1) // expands to (1, 2)
<pre></div>
</body>
</html>