43 lines
1.8 KiB
HTML
43 lines
1.8 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_VARIADIC_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_VARIADIC_ELEM</b> variadic macro
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extracts an element from <i>variadic data</i>. </div>
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<h4>Usage</h4>
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<div class="code"> <b>BOOST_PP_VARIADIC_ELEM</b>(<i>i</i>, <i>...</i>) <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><dt>i</dt>
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<dd> The zero-based index into the <i>variadic data</i> of the element to be
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extracted. Valid values range from <i>0</i> to the size of the variadic data - 1.
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</dd>
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<dt>...<br>
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</dt>
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<dd> The <i>variadic data</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>The index <i>i</i> must be less than the size of the <i>variadic data</i>. </div>
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<h4>See Also</h4>
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<ul>
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<li><a href="limit_variadic.html">BOOST_PP_LIMIT_VARIADIC</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/variadic/elem.html"><boost/preprocessor/variadic/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/variadic/elem.html">boost/preprocessor/variadic/elem.hpp</a>><br><br>#define VAR_DATA a, b, c, d<br><br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(0, VAR_DATA) // expands to a<br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(3, VAR_DATA) // expands to d<br></pre>
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</div>
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<hr size="1">
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<div style="margin-left: 0px;"> <i></i><i>© Copyright Edward Diener 2011,2013</i> </div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version 1.0.
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(See accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
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or 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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