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<html>
<head>
<title>BOOST_PP_ASSERT</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_ASSERT</b> macro conditionally causes a preprocessing error.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_ASSERT</b>(<i>cond</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>cond</dt>
<dd>
A condition that determines whether an assertion occurs.
Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
</dd>
</dl>
<h4>Remarks</h4>
<div>
If <i>cond</i> expands to <i>0</i>, this macro causes a preprocessing error.
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> <a href="../headers/debug/assert.html"><boost/preprocessor/debug/assert.hpp></a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
#include <<a href="../headers/debug/assert.html">boost/preprocessor/debug/assert.hpp</a>>
#include <<a href="../headers/logical/bitnor.html">boost/preprocessor/logical/bitnor.hpp</a>>
#include <<a href="../headers/logical/compl.html">boost/preprocessor/logical/compl.hpp</a>>
// The is BOOST_PP_IS_NULLARY macro is not part of
// the public interface of the library because it
// doesn't work on Borland preprocessors. It is
// only used here to illustrate assertions. In
// effect, it detects whether an argument is empty
// parenthesis or some text.
#include <boost/preprocessor/detail/is_nullary.hpp>
#define IS_EDISON_DESIGN_GROUP() \
<a href="compl.html">BOOST_PP_COMPL</a>( \
BOOST_PP_IS_NULLARY( \
<a href="cat.html">BOOST_PP_CAT</a>(IS_EDG_CHECK, __EDG_VERSION) \
) \
) \
/**/
#define IS_EDG_CHECK__EDG_VERSION ()
#define IS_METROWERKS() \
<a href="compl.html">BOOST_PP_COMPL</a>( \
BOOST_PP_IS_NULLARY( \
<a href="cat.html">BOOST_PP_CAT</a>(IS_MWERKS_CHECK, __MWERKS__) \
) \
) \
/**/
#define IS_MWERKS_CHECK__MWERKS__ ()
#define IS_MICROSOFT() \
<a href="bitnor.html">BOOST_PP_BITNOR</a>( \
IS_MICROSOFT_ROOT(), \
IS_EDISON_DESIGN_GROUP() \
) \
/**/
#define IS_MICROSOFT_ROOT() \
BOOST_PP_IS_NULLARY( \
<a href="cat.html">BOOST_PP_CAT</a>(IS_MSVC_CHECK, _MSC_VER) \
) \
/**/
#define IS_MSVC_CHECK_MS_VER ()
// this macro doesn't work on EDG...
// (this is just an example)
#define MACRO(n) \
<a href="cat.html">BOOST_PP_CAT</a>( \
MACRO_, \
IS_EDISON_DESIGN_GROUP() \
)(n) \
/**/
#define MACRO_1(n) \
<a href="assert.html">BOOST_PP_ASSERT</a>(0) \
"Edison Design Group is not supported" \
/**/
#define MACRO_0(n) normal mode: n
MACRO(10)
</pre></div>
<hr size="1">
<div style="margin-left: 0px;">
<i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
</br><i>© Copyright Paul Mensonides 2002</i>
</div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
</div>
</body>
</html>
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