97 lines
3.3 KiB
HTML
97 lines
3.3 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_ENUM_z</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_ENUM_<i>z</i></b> macro represents a reentry into the <b>BOOST_PP_ENUM</b> repetition construct.
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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_ENUM_</b> ## <i>z</i>(<i>count</i>, <i>macro</i>, <i>data</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>z</dt>
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<dd>
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The next available <b>BOOST_PP_REPEAT</b> dimension.
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</dd>
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<dt>count</dt>
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<dd>
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The number of repetitious calls to <i>macro</i>.
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Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>.
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</dd>
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<dt>macro</dt>
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<dd>
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A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>).
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This macro is expanded by <b>BOOST_PP_ENUM</b> with the next available repetition depth,
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the current repetition number, and the auxiliary <i>data</i> argument.
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</dd>
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<dt>data</dt>
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<dd>
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Auxiliary data passed to <i>macro</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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This macro expands to the sequence:
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<div>
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<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>)
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</div>
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</div>
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<div>
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At certain times, it may be necessary to perform the concatenation with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting operator.
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This happens when the <i>z</i> value is a macro invocation itself.
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It needs a delay to allow it to expand.
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The syntax in such a scenario becomes:
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<div>
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<b>BOOST_PP_CAT</b>(<b>BOOST_PP_ENUM_</b>, <i>z</i>)(<i>count</i>, <i>macro</i>, <i>data</i>)
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</div>
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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="cat.html">BOOST_PP_CAT</a></li>
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<li><a href="enum.html">BOOST_PP_ENUM</a></li>
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<li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</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/repetition/enum.html"><boost/preprocessor/repetition/enum.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/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>>
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#include <<a href="../headers/repetition/enum.html">boost/preprocessor/repetition/enum.hpp</a>>
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#define TEXT(z, n, text) text
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#define TTP(z, n, _) \
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template< \
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<a href="enum_z.html">BOOST_PP_ENUM_</a> ## z(<a href="inc.html">BOOST_PP_INC</a>(n), TEXT, class) \
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> \
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class T ## n \
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/**/
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<a href="enum.html">BOOST_PP_ENUM</a>(3, TTP, nil)
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/*
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expands to...
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template<class> class T0,
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template<class, class> class T1,
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template<class, class, class> class T2
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*/
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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><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i><EFBFBD> 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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