| <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> |
