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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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