65 lines
2.8 KiB
HTML
65 lines
2.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=windows-1252">
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<title>BOOST_PP_TUPLE_ELEM</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;"> The <b>BOOST_PP_TUPLE_ELEM</b>
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macro extracts an element from a <i>tuple</i>. </div>
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<h4>Usage</h4>
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<div class="code"> <b>BOOST_PP_TUPLE_ELEM</b>(<i>i</i>, <i>tuple</i>)
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<a
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href="file:///E:/Programming/VersionControl/modular-boost/libs/preprocessor/doc/topics/variadic_macros.html#VNotation"
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target="_self"><sup>(v)</sup></a><br>
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<br>
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or<br>
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<br>
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<b>BOOST_PP_TUPLE_ELEM</b>(<i>size</i>, <i>i</i>, <i>tuple</i>)
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<a href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br>
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>size</dt>
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<dd> The size of the <i>tuple</i>. The size is ignored.<br>
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</dd>
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<dt>i</dt>
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<dd> The zero-based index into the <i>tuple</i> of the element to
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be extracted. Valid values range from <i>0</i> to <i>size</i>
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- <i>1</i>. </dd>
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<dt>tuple</dt>
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<dd> The <i>tuple</i> from which an element is to be extracted. </dd>
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</dl>
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<h4>Remarks</h4>
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<div>You can invoke the variadic macro as BOOST_PP_TUPLE_ELEM(<i>i</i>,<i>tuple</i>),
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or BOOST_PP_TUPLE_ELEM(<i>size</i>,<i>i</i>,<i>tuple</i>) for
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backward compatibility. </div>
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<h4>See Also</h4>
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<ul>
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<li><a href="limit_tuple.html">BOOST_PP_LIMIT_TUPLE</a></li>
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</ul>
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<h4>Requirements</h4>
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<div> <b>Header:</b> <a href="../headers/tuple/elem.html"><boost/preprocessor/tuple/elem.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div>
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<pre>#include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>><br><br>#define TUPLE (a, b, c, d)<br><br><a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(0, TUPLE) // expands to a in the variadic version<br><a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(3, TUPLE) // expands to d in the variadic version<br></pre>
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</div>
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<hr size="1">
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<div style="margin-left: 0px;"> <i><EFBFBD> Copyright <a
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href="http://www.housemarque.com" target="_top">Housemarque Oy</a>
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2002</i> <br>
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<i><EFBFBD> Copyright Paul Mensonides 2002<br>
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</i><i><EFBFBD> Copyright Edward Diener 2011,2013,2020</i><br>
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</div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version
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1.0. (See accompanying file <a
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href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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</div>
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</body>
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</html>
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