115 lines
3.4 KiB
HTML
115 lines
3.4 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_ASSERT</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_ASSERT</b> macro conditionally causes a preprocessing error.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_ASSERT</b>(<i>cond</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>cond</dt>
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<dd>
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A condition that determines whether an assertion occurs.
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Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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If <i>cond</i> expands to <i>0</i>, this macro causes a preprocessing error.
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Otherwise, it expands to nothing.
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="assert_msg.html">BOOST_PP_ASSERT_MSG</a></li>
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<li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/debug/assert.html"><boost/preprocessor/debug/assert.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div><pre>
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#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
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#include <<a href="../headers/debug/assert.html">boost/preprocessor/debug/assert.hpp</a>>
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#include <<a href="../headers/logical/bitnor.html">boost/preprocessor/logical/bitnor.hpp</a>>
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#include <<a href="../headers/logical/compl.html">boost/preprocessor/logical/compl.hpp</a>>
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// The is BOOST_PP_IS_NULLARY macro is not part of
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// the public interface of the library because it
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// doesn't work on Borland preprocessors. It is
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// only used here to illustrate assertions. In
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// effect, it detects whether an argument is empty
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// parenthesis or some text.
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#include <boost/preprocessor/detail/is_nullary.hpp>
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#define IS_EDISON_DESIGN_GROUP() \
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<a href="compl.html">BOOST_PP_COMPL</a>( \
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BOOST_PP_IS_NULLARY( \
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<a href="cat.html">BOOST_PP_CAT</a>(IS_EDG_CHECK, __EDG_VERSION) \
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) \
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) \
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/**/
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#define IS_EDG_CHECK__EDG_VERSION ()
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#define IS_METROWERKS() \
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<a href="compl.html">BOOST_PP_COMPL</a>( \
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BOOST_PP_IS_NULLARY( \
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<a href="cat.html">BOOST_PP_CAT</a>(IS_MWERKS_CHECK, __MWERKS__) \
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) \
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) \
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/**/
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#define IS_MWERKS_CHECK__MWERKS__ ()
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#define IS_MICROSOFT() \
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<a href="bitnor.html">BOOST_PP_BITNOR</a>( \
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IS_MICROSOFT_ROOT(), \
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IS_EDISON_DESIGN_GROUP() \
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) \
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/**/
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#define IS_MICROSOFT_ROOT() \
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BOOST_PP_IS_NULLARY( \
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<a href="cat.html">BOOST_PP_CAT</a>(IS_MSVC_CHECK, _MSC_VER) \
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) \
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/**/
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#define IS_MSVC_CHECK_MS_VER ()
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// this macro doesn't work on EDG...
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// (this is just an example)
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#define MACRO(n) \
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<a href="cat.html">BOOST_PP_CAT</a>( \
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MACRO_, \
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IS_EDISON_DESIGN_GROUP() \
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)(n) \
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/**/
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#define MACRO_1(n) \
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<a href="assert.html">BOOST_PP_ASSERT</a>(0) \
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"Edison Design Group is not supported" \
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/**/
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#define MACRO_0(n) normal mode: n
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MACRO(10)
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</pre></div>
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<hr size="1">
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<div style="margin-left: 0px;">
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<i><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i><EFBFBD> Copyright Paul Mensonides 2002</i>
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</div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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</div>
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</body>
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</html>
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