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1 | <?xml version="1.0" encoding="utf-8" ?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
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6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
7 | <title>The MPL Reference Manual: and_</title> | |
8 | <link rel="stylesheet" href="../style.css" type="text/css" /> | |
9 | </head> | |
10 | <body class="docframe refmanual"> | |
11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./logical-operations.html" class="navigation-link">Prev</a> <a href="./or.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./or.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./logical-operations.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./logical-operations.html" class="navigation-link">Logical Operations</a> / <a href="./and.html" class="navigation-link">and_</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="and"> | |
15 | <h1><a class="toc-backref" href="./logical-operations.html#id1550">and_</a></h1> | |
16 | <div class="section" id="id1068"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | template< | |
20 | typename F1 | |
21 | , typename F2 | |
22 | <em>...</em> | |
23 | , typename F<em>n</em> = <em>unspecified</em> | |
24 | > | |
25 | struct <a href="./and.html" class="identifier">and_</a> | |
26 | { | |
27 | typedef <em>unspecified</em> type; | |
28 | }; | |
29 | </pre> | |
30 | </div> | |
31 | <div class="section" id="id1069"> | |
32 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
33 | <p>Returns the result of short-circuit <em>logical and</em> (<tt class="literal"><span class="pre">&&</span></tt>) operation on its arguments.</p> | |
34 | </div> | |
35 | <div class="section" id="id1070"> | |
36 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
37 | <pre class="literal-block"> | |
38 | #include <<a href="../../../../boost/mpl/and.hpp" class="header">boost/mpl/and.hpp</a>> | |
39 | #include <<a href="../../../../boost/mpl/logical.hpp" class="header">boost/mpl/logical.hpp</a>> | |
40 | </pre> | |
41 | </div> | |
42 | <div class="section" id="id1071"> | |
43 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
44 | <table border="1" class="docutils table"> | |
45 | <colgroup> | |
46 | <col width="17%" /> | |
47 | <col width="30%" /> | |
48 | <col width="53%" /> | |
49 | </colgroup> | |
50 | <thead valign="bottom"> | |
51 | <tr><th class="head">Parameter</th> | |
52 | <th class="head">Requirement</th> | |
53 | <th class="head">Description</th> | |
54 | </tr> | |
55 | </thead> | |
56 | <tbody valign="top"> | |
57 | <tr><td><tt class="literal"><span class="pre">F1</span></tt>, <tt class="literal"><span class="pre">F2</span></tt>,... <tt class="literal"><span class="pre">Fn</span></tt></td> | |
58 | <td>Nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td> | |
59 | <td>Operation's arguments.</td> | |
60 | </tr> | |
61 | </tbody> | |
62 | </table> | |
63 | </div> | |
64 | <div class="section" id="id1072"> | |
65 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
66 | <p>For arbitrary nullary <a class="reference internal" href="./metafunction.html">Metafunction</a>s <tt class="literal"><span class="pre">f1</span></tt>, <tt class="literal"><span class="pre">f2</span></tt>,... <tt class="literal"><span class="pre">fn</span></tt>:</p> | |
67 | <pre class="literal-block"> | |
68 | typedef <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>>::type r; | |
69 | </pre> | |
70 | <table class="docutils field-list" frame="void" rules="none"> | |
71 | <col class="field-name" /> | |
72 | <col class="field-body" /> | |
73 | <tbody valign="top"> | |
74 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</td> | |
75 | </tr> | |
76 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">r</span></tt> is <tt class="literal"><span class="pre"><a href="./bool.html" class="identifier">false_</a></span></tt> if either of <tt class="literal"><span class="pre">f1::type::value</span></tt>, <tt class="literal"><span class="pre">f2::type::value</span></tt>,... | |
77 | <tt class="literal"><span class="pre">fn::type::value</span></tt> expressions evaluates to <tt class="literal"><span class="pre">false</span></tt>, and <tt class="literal"><span class="pre"><a href="./bool.html" class="identifier">true_</a></span></tt> otherwise; | |
78 | guarantees left-to-right evaluation; the operands subsequent to the first | |
79 | <tt class="literal"><span class="pre">f</span></tt><em>i</em> metafunction that evaluates to <tt class="literal"><span class="pre">false</span></tt> are not evaluated.</td> | |
80 | </tr> | |
81 | </tbody> | |
82 | </table> | |
83 | <!-- .......................................................................... --> | |
84 | <pre class="literal-block"> | |
85 | typedef <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>> r; | |
86 | </pre> | |
87 | <table class="docutils field-list" frame="void" rules="none"> | |
88 | <col class="field-name" /> | |
89 | <col class="field-body" /> | |
90 | <tbody valign="top"> | |
91 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> | |
92 | </td> | |
93 | </tr> | |
94 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
95 | <pre class="last literal-block"> | |
96 | struct r : <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>>::type {}; | |
97 | </pre> | |
98 | </td> | |
99 | </tr> | |
100 | </tbody> | |
101 | </table> | |
102 | </div> | |
103 | <div class="section" id="id1073"> | |
104 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
105 | <pre class="literal-block"> | |
106 | struct unknown; | |
107 | ||
108 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">true_</a>,<a href="./bool.html" class="identifier">true_</a> > )); | |
109 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">false_</a>,<a href="./bool.html" class="identifier">true_</a> > )); | |
110 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">true_</a>,<a href="./bool.html" class="identifier">false_</a> > )); | |
111 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">false_</a>,<a href="./bool.html" class="identifier">false_</a> > )); | |
112 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">false_</a>,unknown > )); // OK | |
113 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./and.html" class="identifier">and_</a>< <a href="./bool.html" class="identifier">false_</a>,unknown,unknown > )); // OK too | |
114 | </pre> | |
115 | </div> | |
116 | <div class="section" id="id1074"> | |
117 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
118 | <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./logical-operations.html">Logical Operations</a>, <a class="reference internal" href="./or.html">or_</a>, <a class="reference internal" href="./not.html">not_</a></p> | |
119 | <!-- Metafunctions/Logical Operations//or_ |20 --> | |
120 | </div> | |
121 | </div> | |
122 | ||
123 | <div class="footer-separator"></div> | |
124 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./logical-operations.html" class="navigation-link">Prev</a> <a href="./or.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./or.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./logical-operations.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
125 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
126 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
127 | 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> | |
128 | </html> |