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<head>
	<title>BOOST_PP_ASSERT</title>
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<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.&nbsp;
				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.&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.html">&lt;boost/preprocessor/debug/assert.hpp&gt;</a>
		</div>
	<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>&gt;
#include &lt;<a href="../headers/debug/assert.html">boost/preprocessor/debug/assert.hpp</a>&gt;
#include &lt;<a href="../headers/logical/bitnor.html">boost/preprocessor/logical/bitnor.hpp</a>&gt;
#include &lt;<a href="../headers/logical/compl.html">boost/preprocessor/logical/compl.hpp</a>&gt;

// 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 &lt;boost/preprocessor/detail/is_nullary.hpp&gt;

#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>
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	<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>
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