129 lines
9.3 KiB
HTML
129 lines
9.3 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: or_</title>
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<link rel="stylesheet" href="../style.css" type="text/css" />
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</head>
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<body class="docframe refmanual">
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<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>
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<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>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="or">
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<h1><a class="toc-backref" href="./logical-operations.html#id1551">or_</a></h1>
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<div class="section" id="id1075">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename F1
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, typename F2
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<em>...</em>
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, typename F<em>n</em> = <em>unspecified</em>
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>
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struct <a href="./or.html" class="identifier">or_</a>
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{
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typedef <em>unspecified</em> type;
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};
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</pre>
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</div>
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<div class="section" id="id1076">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Returns the result of short-circuit <em>logical or</em> (<tt class="literal"><span class="pre">||</span></tt>) operation on its arguments.</p>
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</div>
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<div class="section" id="id1077">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/or.hpp" class="header">boost/mpl/or.hpp</a>>
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#include <<a href="../../../../boost/mpl/logical.hpp" class="header">boost/mpl/logical.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id1078">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="17%" />
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<col width="30%" />
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<col width="53%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<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>
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<td>Nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td>
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<td>Operation's arguments.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id1079">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<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>
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<pre class="literal-block">
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typedef <a href="./or.html" class="identifier">or_</a><f1,f2,<em>...</em>,f<em>n</em>>::type r;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<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>
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</tr>
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<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>,...
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<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;
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guarantees left-to-right evaluation; the operands subsequent to the first
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<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>
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</tr>
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</tbody>
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</table>
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<!-- .......................................................................... -->
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<pre class="literal-block">
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typedef <a href="./or.html" class="identifier">or_</a><f1,f2,<em>...</em>,f<em>n</em>> r;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<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>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
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<pre class="last literal-block">
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struct r : <a href="./or.html" class="identifier">or_</a><f1,f2,<em>...</em>,f<em>n</em>>::type {};
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id1080">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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struct unknown;
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<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> > ));
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<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> > ));
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<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> > ));
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<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> > ));
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<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
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<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
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</pre>
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</div>
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<div class="section" id="id1081">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<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>
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<!-- Metafunctions/Logical Operations//not_ |30 -->
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</div>
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</div>
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<div class="footer-separator"></div>
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<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>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</html>
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