65 lines
2.0 KiB
HTML
65 lines
2.0 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_APPLY</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;">
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The <b>BOOST_PP_APPLY</b> macro abstracts the difference between an argument and nothing.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_APPLY</b>(<i>x</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>x</dt>
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<dd>
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The abstracted argument.
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This argument must be either <b>BOOST_PP_NIL</b> or a <i>tuple</i> with one element--such as <i>(arg)</i> or <i>((a, b))</i>.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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If <i>x</i> is <b>BOOST_PP_NIL</b>, this macro expands to nothing.
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If <i>x</i> is a one element <i>tuple</i>, it expands to the contents of that <i>tuple</i>.
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="nil.html">BOOST_PP_NIL</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/facilities/apply.html"><boost/preprocessor/facilities/apply.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div><pre>
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#include <<a href="../headers/facilities/apply.html">boost/preprocessor/facilities/apply.hpp</a>>
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#include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>>
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#define CV(i) \
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<a href="apply.html">BOOST_PP_APPLY</a>( \
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<a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>( \
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4, i, \
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(<a href="nil.html">BOOST_PP_NIL</a>, (const), (volatile), (const volatile)) \
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) \
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) \
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/**/
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CV(0) // expands to nothing
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CV(1) // expands to const
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</pre></div>
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<hr size="1">
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<div style="margin-left: 0px;">
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<i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i>© Copyright Paul Mensonides 2002</i>
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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 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"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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