projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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"> | |
| 3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> | |
| 4 | <head> | |
| 5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: or_</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="./and.html" class="navigation-link">Prev</a> <a href="./not.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./and.html" class="navigation-link">Back</a> <a href="./not.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="./or.html" class="navigation-link">or_</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="or"> | |
| 15 | <h1><a class="toc-backref" href="./logical-operations.html#id1551">or_</a></h1> | |
| 16 | <div class="section" id="id1075"> | |
| 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="./or.html" class="identifier">or_</a> | |
| 26 | { | |
| 27 | typedef <em>unspecified</em> type; | |
| 28 | }; | |
| 29 | </pre> | |
| 30 | </div> | |
| 31 | <div class="section" id="id1076"> | |
| 32 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 33 | <p>Returns the result of short-circuit <em>logical or</em> (<tt class="literal"><span class="pre">||</span></tt>) operation on its arguments.</p> | |
| 34 | </div> | |
| 35 | <div class="section" id="id1077"> | |
| 36 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 37 | <pre class="literal-block"> | |
| 38 | #include <<a href="../../../../boost/mpl/or.hpp" class="header">boost/mpl/or.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="id1078"> | |
| 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="id1079"> | |
| 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="./or.html" class="identifier">or_</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">true_</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">true</span></tt>, and <tt class="literal"><span class="pre"><a href="./bool.html" class="identifier">false_</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">true</span></tt> are not evaluated.</td> | |
| 80 | </tr> | |
| 81 | </tbody> | |
| 82 | </table> | |
| 83 | <!-- .......................................................................... --> | |
| 84 | <pre class="literal-block"> | |
| 85 | typedef <a href="./or.html" class="identifier">or_</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="./or.html" class="identifier">or_</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="id1080"> | |
| 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="./or.html" class="identifier">or_</a>< <a href="./bool.html" class="identifier">true_</a>,<a href="./bool.html" class="identifier">true_</a> > )); | |
| 109 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./or.html" class="identifier">or_</a>< <a href="./bool.html" class="identifier">false_</a>,<a href="./bool.html" class="identifier">true_</a> > )); | |
| 110 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./or.html" class="identifier">or_</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="./or.html" class="identifier">or_</a>< <a href="./bool.html" class="identifier">false_</a>,<a href="./bool.html" class="identifier">false_</a> > )); | |
| 112 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./or.html" class="identifier">or_</a>< <a href="./bool.html" class="identifier">true_</a>,unknown > )); // OK | |
| 113 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./or.html" class="identifier">or_</a>< <a href="./bool.html" class="identifier">true_</a>,unknown,unknown > )); // OK too | |
| 114 | </pre> | |
| 115 | </div> | |
| 116 | <div class="section" id="id1081"> | |
| 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="./and.html">and_</a>, <a class="reference internal" href="./not.html">not_</a></p> | |
| 119 | <!-- Metafunctions/Logical Operations//not_ |30 --> | |
| 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="./and.html" class="navigation-link">Prev</a> <a href="./not.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./and.html" class="navigation-link">Back</a> <a href="./not.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> |