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- <html>
- <head>
- <title>BOOST_PP_ENUM_TRAILING_z</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
- <body>
- <div style="margin-left: 0px;">
- The <b>BOOST_PP_ENUM_TRAILING_<i>z</i></b> macro represents a reentry into the <b>BOOST_PP_ENUM_TRAILING</b> repetition construct.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_ENUM_TRAILING_</b> ## <i>z</i>(<i>count</i>, <i>macro</i>, <i>data</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>z</dt>
- <dd>
- The next available <b>BOOST_PP_REPEAT</b> dimension.
- </dd>
- <dt>count</dt>
- <dd>
- The number of repetitious calls to <i>macro</i>.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>.
- </dd>
- <dt>macro</dt>
- <dd>
- A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>).
- This macro is expanded by <b>BOOST_PP_ENUM</b> with the next available repetition depth,
- the current repetition number, and the auxiliary <i>data</i> argument.
- </dd>
- <dt>data</dt>
- <dd>
- Auxiliary data passed to <i>macro</i>.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- This macro expands to the sequence:
- <div>
- , <i>macro</i>(<i>z</i>, <i>0</i>, <i>data</i>), <i>macro</i>(<i>z</i>, <i>1</i>, <i>data</i>), ... <i>macro</i>(<i>z</i>, <i>count</i> - <i>1</i>, <i>data</i>)
- </div>
- </div>
- <div>
- At certain times, it may be necessary to perform the concatenation with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting operator.
- This happens when the <i>z</i> value is a macro invocation itself.
- It needs a delay to allow it to expand.
- The syntax in such a scenario becomes:
- <div>
- <b>BOOST_PP_CAT</b>(<b>BOOST_PP_ENUM_TRAILING_</b>, <i>z</i>)(<i>count</i>, <i>macro</i>, <i>data</i>)
- </div>
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="cat.html">BOOST_PP_CAT</a></li>
- <li><a href="enum_trailing.html">BOOST_PP_ENUM_TRAILING</a></li>
- <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/repetition/enum_trailing.html"><boost/preprocessor/repetition/enum_trailing.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/repetition/enum.html">boost/preprocessor/repetition/enum.hpp</a>>
- #include <<a href="../headers/repetition/enum_trailing.html">boost/preprocessor/repetition/enum_trailing.hpp</a>>
- #define TEXT(z, n, text) text
- #define TTP(z, n, _) \
- template< \
- class <a href="enum_z.html">BOOST_PP_ENUM_TRAILING_</a> ## z(n, TEXT, class) \
- > \
- class T ## n \
- /**/
- <a href="enum.html">BOOST_PP_ENUM</a>(3, TTP, nil)
- /*
- expands to...
- template<class> class T0,
- template<class, class> class T1,
- template<class, class, class> class T2
- */
- </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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