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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 | ||
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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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