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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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