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- <title>The MPL Reference Manual: and_</title>
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- <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>
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- <div class="section" id="and">
- <h1><a class="toc-backref" href="./logical-operations.html#id1550">and_</a></h1>
- <div class="section" id="id1068">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename F1
- , typename F2
- <em>...</em>
- , typename F<em>n</em> = <em>unspecified</em>
- >
- struct <a href="./and.html" class="identifier">and_</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id1069">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns the result of short-circuit <em>logical and</em> (<tt class="literal"><span class="pre">&&</span></tt>) operation on its arguments.</p>
- </div>
- <div class="section" id="id1070">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/and.hpp" class="header">boost/mpl/and.hpp</a>>
- #include <<a href="../../../../boost/mpl/logical.hpp" class="header">boost/mpl/logical.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id1071">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="17%" />
- <col width="30%" />
- <col width="53%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <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>
- <td>Nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td>
- <td>Operation's arguments.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1072">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <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>
- <pre class="literal-block">
- typedef <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>>::type r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <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>
- </tr>
- <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>,...
- <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;
- guarantees left-to-right evaluation; the operands subsequent to the first
- <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>
- </tr>
- </tbody>
- </table>
- <!-- .......................................................................... -->
- <pre class="literal-block">
- typedef <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>> r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <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>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- struct r : <a href="./and.html" class="identifier">and_</a><f1,f2,<em>...</em>,f<em>n</em>>::type {};
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1073">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- struct unknown;
- <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> > ));
- <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> > ));
- <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> > ));
- <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> > ));
- <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
- <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
- </pre>
- </div>
- <div class="section" id="id1074">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <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>
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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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