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- <title>BOOST_PP_APPLY</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
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- The <b>BOOST_PP_APPLY</b> macro abstracts the difference between an argument and nothing.
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- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_APPLY</b>(<i>x</i>)
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- <h4>Arguments</h4>
- <dl>
- <dt>x</dt>
- <dd>
- The abstracted argument.
- 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>.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- If <i>x</i> is <b>BOOST_PP_NIL</b>, this macro expands to nothing.
- If <i>x</i> is a one element <i>tuple</i>, it expands to the contents of that <i>tuple</i>.
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="nil.html">BOOST_PP_NIL</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/facilities/apply.html"><boost/preprocessor/facilities/apply.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/facilities/apply.html">boost/preprocessor/facilities/apply.hpp</a>>
- #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>>
- #define CV(i) \
- <a href="apply.html">BOOST_PP_APPLY</a>( \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>( \
- 4, i, \
- (<a href="nil.html">BOOST_PP_NIL</a>, (const), (volatile), (const volatile)) \
- ) \
- ) \
- /**/
- CV(0) // expands to nothing
- CV(1) // expands to const
- </pre></div>
- <hr size="1">
- <div style="margin-left: 0px;">
- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
- </div>
- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
- copy at <a href=
- "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
- </div>
- </body>
- </html>
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