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Paul Mensonides
2002-09-08 09:40:56 +00:00
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<html>
<head>
<title>BOOST_PP_ASSERT_MSG</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_ASSERT_MSG</b> macro conditionally inserts debugging text.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_ASSERT_MSG</b>(<i>cond</i>, <i>msg</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>cond</dt>
<dd>
A condition that determines whether an assertion occurs.&nbsp;
Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
</dd>
<dt>msg</dt>
<dd>
A message to display if <i>cond</i> evaluates to <i>0</i>.
</dd>
</dl>
<h4>Remarks</h4>
<div>
If <i>cond</i> expands to <i>0</i>, this macro expands to <i>msg</i>.&nbsp;
Otherwise, it expands to nothing.
</div>
<h4>See Also</h4>
<ul>
<li><a href="assert_msg.html">BOOST_PP_ASSERT_MSG</a></li>
<li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/debug/assert.hpp.html">&lt;boost/preprocessor/debug/assert.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/comparison/equal.hpp&gt;
#include &lt;boost/preprocessor/debug/assert.hpp&gt;
// lines are supposed to be counted
// in translation phase 1
#line 9
BOOST_PP_ASSERT_MSG( /* ....... */ \
BOOST_PP_EQUAL(__LINE__, 9), \
"weird line numbering detected" \
)
<pre></div>
</body>
</html>