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Paul Mensonides
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<html>
<head>
<title>BOOST_PP_INTERCEPT</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_INTERCEPT</b> macro intercepts a numeric concatenation and expands to nothing.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_INTERCEPT</b>
</div>
<h4>Remarks</h4>
<div>
This macro is used to intercept concatenations performed by various other library constructs.&nbsp;
It is typically used after other text to prevent eat the concatenation expand to nothing.&nbsp;
This macro can only intercept integer constants in the range of <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
</div>
<h4>See Also</h4>
<ul>
<li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/facilities/intercept.hpp.html">&lt;boost/preprocessor/facilities/intercept.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/intercept.hpp&gt;
#include &lt;boost/preprocessor/repetition/enum_binary_params.hpp&gt;
BOOST_PP_ENUM_BINARY_PARAMS(3, class T, = U)
// expands to class T0 = U0, class T1 = U1, class T2 = U2
BOOST_PP_ENUM_BINARY_PARAMS(3, class T, = int BOOST_PP_INTERCEPT)
// expands to class T0 = int, class T1 = int, class T2 = int
<pre></div>
</body>
</html>