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| 7 | <title>The MPL Reference Manual: BOOST_MPL_ASSERT_NOT</title> | |
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| 12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./macros.html" class="navigation-link">Macros</a> / <a href="./asserts.html" class="navigation-link">Asserts</a> / <a href="./assert-not.html" class="navigation-link">BOOST_MPL_ASSERT_NOT</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="boost-mpl-assert-not"> | |
| 15 | <h1><a class="toc-backref" href="./asserts.html#id1590">BOOST_MPL_ASSERT_NOT</a></h1> | |
| 16 | <div class="section" id="id1301"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | #define <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>( pred ) \ | |
| 20 | <em>unspecified token sequence</em> \ | |
| 21 | /**/ | |
| 22 | </pre> | |
| 23 | </div> | |
| 24 | <div class="section" id="id1302"> | |
| 25 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 26 | <p>Generates a compilation error when predicate holds true.</p> | |
| 27 | </div> | |
| 28 | <div class="section" id="id1303"> | |
| 29 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 30 | <pre class="literal-block"> | |
| 31 | #include <<a href="../../../../boost/mpl/assert.hpp" class="header">boost/mpl/assert.hpp</a>> | |
| 32 | </pre> | |
| 33 | </div> | |
| 34 | <div class="section" id="id1304"> | |
| 35 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 36 | <table border="1" class="docutils table"> | |
| 37 | <colgroup> | |
| 38 | <col width="16%" /> | |
| 39 | <col width="38%" /> | |
| 40 | <col width="46%" /> | |
| 41 | </colgroup> | |
| 42 | <thead valign="bottom"> | |
| 43 | <tr><th class="head">Parameter</th> | |
| 44 | <th class="head">Requirement</th> | |
| 45 | <th class="head">Description</th> | |
| 46 | </tr> | |
| 47 | </thead> | |
| 48 | <tbody valign="top"> | |
| 49 | <tr><td><tt class="literal"><span class="pre">pred</span></tt></td> | |
| 50 | <td>Boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td> | |
| 51 | <td>A predicate to be asserted to be false.</td> | |
| 52 | </tr> | |
| 53 | </tbody> | |
| 54 | </table> | |
| 55 | </div> | |
| 56 | <div class="section" id="id1305"> | |
| 57 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 58 | <p>For any boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">pred</span></tt>:</p> | |
| 59 | <pre class="literal-block"> | |
| 60 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( pred )); | |
| 61 | </pre> | |
| 62 | <table class="docutils field-list" frame="void" rules="none"> | |
| 63 | <col class="field-name" /> | |
| 64 | <col class="field-body" /> | |
| 65 | <tbody valign="top"> | |
| 66 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None.</p> | |
| 67 | </td> | |
| 68 | </tr> | |
| 69 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Generates a compilation error if <tt class="literal"><span class="pre">pred::type::value</span> <span class="pre">!=</span> <span class="pre">false</span></tt>, otherwise | |
| 70 | has no effect. Note that double parentheses are required even if no commas | |
| 71 | appear in the condition.</p> | |
| 72 | <p>When possible within the compiler's diagnostic capabilities, | |
| 73 | the error message will include the predicate's full type name, and have a | |
| 74 | general form of:</p> | |
| 75 | <pre class="last literal-block"> | |
| 76 | <em>...</em> ************boost::mpl::<a href="./not.html" class="identifier">not_</a>< pred >::************ <em>...</em> | |
| 77 | </pre> | |
| 78 | </td> | |
| 79 | </tr> | |
| 80 | </tbody> | |
| 81 | </table> | |
| 82 | </div> | |
| 83 | <div class="section" id="id1306"> | |
| 84 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 85 | <pre class="literal-block"> | |
| 86 | template< typename T, typename U > struct my | |
| 87 | { | |
| 88 | // ... | |
| 89 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( is_same< T,U > )); | |
| 90 | }; | |
| 91 | ||
| 92 | my<void,void> test; | |
| 93 | ||
| 94 | // In instantiation of `my<void, void>': | |
| 95 | // instantiated from here | |
| 96 | // conversion from ` | |
| 97 | // mpl_::failed************boost::mpl::<a href="./not.html" class="identifier">not_</a><boost::is_same<void, void> | |
| 98 | // >::************' to non-scalar type `mpl_::assert<false>' requested | |
| 99 | </pre> | |
| 100 | </div> | |
| 101 | <div class="section" id="id1307"> | |
| 102 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 103 | <p><a class="reference internal" href="./asserts.html">Asserts</a>, <a class="reference internal" href="./assert.html">BOOST_MPL_ASSERT</a>, <a class="reference internal" href="./assert-msg.html">BOOST_MPL_ASSERT_MSG</a>, <a class="reference internal" href="./assert-relation.html">BOOST_MPL_ASSERT_RELATION</a></p> | |
| 104 | <!-- Macros/Asserts//BOOST_MPL_ASSERT_RELATION --> | |
| 105 | </div> | |
| 106 | </div> | |
| 107 | ||
| 108 | <div class="footer-separator"></div> | |
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| 110 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 111 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 112 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
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