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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>