projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_ASSERT</title> | |
| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> | |
| 5 | </head> | |
| 6 | <body> | |
| 7 | <div style="margin-left: 0px;"> | |
| 8 | The <b>BOOST_PP_ASSERT</b> macro conditionally causes a preprocessing error. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | <b>BOOST_PP_ASSERT</b>(<i>cond</i>) | |
| 13 | </div> | |
| 14 | <h4>Arguments</h4> | |
| 15 | <dl> | |
| 16 | <dt>cond</dt> | |
| 17 | <dd> | |
| 18 | A condition that determines whether an assertion occurs. | |
| 19 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>. | |
| 20 | </dd> | |
| 21 | </dl> | |
| 22 | <h4>Remarks</h4> | |
| 23 | <div> | |
| 24 | If <i>cond</i> expands to <i>0</i>, this macro causes a preprocessing error. | |
| 25 | Otherwise, it expands to nothing. | |
| 26 | </div> | |
| 27 | <h4>See Also</h4> | |
| 28 | <ul> | |
| 29 | <li><a href="assert_msg.html">BOOST_PP_ASSERT_MSG</a></li> | |
| 30 | <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li> | |
| 31 | </ul> | |
| 32 | <h4>Requirements</h4> | |
| 33 | <div> | |
| 34 | <b>Header:</b> <a href="../headers/debug/assert.html"><boost/preprocessor/debug/assert.hpp></a> | |
| 35 | </div> | |
| 36 | <h4>Sample Code</h4> | |
| 37 | <div><pre> | |
| 38 | #include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>> | |
| 39 | #include <<a href="../headers/debug/assert.html">boost/preprocessor/debug/assert.hpp</a>> | |
| 40 | #include <<a href="../headers/logical/bitnor.html">boost/preprocessor/logical/bitnor.hpp</a>> | |
| 41 | #include <<a href="../headers/logical/compl.html">boost/preprocessor/logical/compl.hpp</a>> | |
| 42 | ||
| 43 | // The is BOOST_PP_IS_NULLARY macro is not part of | |
| 44 | // the public interface of the library because it | |
| 45 | // doesn't work on Borland preprocessors. It is | |
| 46 | // only used here to illustrate assertions. In | |
| 47 | // effect, it detects whether an argument is empty | |
| 48 | // parenthesis or some text. | |
| 49 | ||
| 50 | #include <boost/preprocessor/detail/is_nullary.hpp> | |
| 51 | ||
| 52 | #define IS_EDISON_DESIGN_GROUP() \ | |
| 53 | <a href="compl.html">BOOST_PP_COMPL</a>( \ | |
| 54 | BOOST_PP_IS_NULLARY( \ | |
| 55 | <a href="cat.html">BOOST_PP_CAT</a>(IS_EDG_CHECK, __EDG_VERSION) \ | |
| 56 | ) \ | |
| 57 | ) \ | |
| 58 | /**/ | |
| 59 | #define IS_EDG_CHECK__EDG_VERSION () | |
| 60 | ||
| 61 | #define IS_METROWERKS() \ | |
| 62 | <a href="compl.html">BOOST_PP_COMPL</a>( \ | |
| 63 | BOOST_PP_IS_NULLARY( \ | |
| 64 | <a href="cat.html">BOOST_PP_CAT</a>(IS_MWERKS_CHECK, __MWERKS__) \ | |
| 65 | ) \ | |
| 66 | ) \ | |
| 67 | /**/ | |
| 68 | #define IS_MWERKS_CHECK__MWERKS__ () | |
| 69 | ||
| 70 | #define IS_MICROSOFT() \ | |
| 71 | <a href="bitnor.html">BOOST_PP_BITNOR</a>( \ | |
| 72 | IS_MICROSOFT_ROOT(), \ | |
| 73 | IS_EDISON_DESIGN_GROUP() \ | |
| 74 | ) \ | |
| 75 | /**/ | |
| 76 | #define IS_MICROSOFT_ROOT() \ | |
| 77 | BOOST_PP_IS_NULLARY( \ | |
| 78 | <a href="cat.html">BOOST_PP_CAT</a>(IS_MSVC_CHECK, _MSC_VER) \ | |
| 79 | ) \ | |
| 80 | /**/ | |
| 81 | #define IS_MSVC_CHECK_MS_VER () | |
| 82 | ||
| 83 | // this macro doesn't work on EDG... | |
| 84 | // (this is just an example) | |
| 85 | ||
| 86 | #define MACRO(n) \ | |
| 87 | <a href="cat.html">BOOST_PP_CAT</a>( \ | |
| 88 | MACRO_, \ | |
| 89 | IS_EDISON_DESIGN_GROUP() \ | |
| 90 | )(n) \ | |
| 91 | /**/ | |
| 92 | ||
| 93 | #define MACRO_1(n) \ | |
| 94 | <a href="assert.html">BOOST_PP_ASSERT</a>(0) \ | |
| 95 | "Edison Design Group is not supported" \ | |
| 96 | /**/ | |
| 97 | ||
| 98 | #define MACRO_0(n) normal mode: n | |
| 99 | ||
| 100 | MACRO(10) | |
| 101 | </pre></div> | |
| 102 | <hr size="1"> | |
| 103 | <div style="margin-left: 0px;"> | |
| 104 |