93 lines
3.9 KiB
HTML
93 lines
3.9 KiB
HTML
<html>
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<head>
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<meta content="text/html; charset=windows-1252" http-equiv="content-type">
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<title>BOOST_PP_REPEAT_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;"> The <b>BOOST_PP_REPEAT_<i>z</i></b> macro
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represents a reentry into the <b>BOOST_PP_REPEAT</b> repetition
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construct. </div>
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<h4>Usage</h4>
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<div class="code"> <b>BOOST_PP_REPEAT_</b> ## <i>z</i>(<i>count</i>, <i>macro</i>,
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<i>data</i>) </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> The next available <b>BOOST_PP_REPEAT</b> dimension. </dd>
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<dt>count</dt>
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<dd> The number of repetitious calls to <i>macro</i>. Valid values
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range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>. </dd>
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<dt>macro</dt>
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<dd> 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_REPEAT</b> with the next
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available repetition depth, the current repetition number, and the
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auxiliary <i>data</i> argument. </dd>
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<dt>data</dt>
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<dd> Auxiliary data passed to <i>macro</i>. </dd>
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</dl>
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<h4>Remarks</h4>
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<div> This macro expands to the sequence:
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<div> <i>macro</i>(<i>z</i>, <i>0</i>, <i>data</i>) <i>macro</i>(<i>z</i>,
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<i>1</i>, <i>data</i>) ... <i>macro</i>(<i>z</i>, <i>count</i> - <i>1</i>,
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<i>data</i>) </div>
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</div>
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<div> At certain times, it may be necessary to perform the concatenation
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with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting
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operator. This happens when the <i>z</i> value is a macro
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invocation itself. It needs a delay to allow it to expand. The
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syntax in such a scenario becomes:
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<div> <b>BOOST_PP_CAT</b>(<b>BOOST_PP_REPEAT_</b>, <i>z</i>)(<i>count</i>,
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<i>macro</i>, <i>data</i>) </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="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li>
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<li><a href="repeat.html">BOOST_PP_REPEAT</a></li>
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<li><a href="repeat_z_macros.html"><span style="color: gray;">Macros with
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Z re-entrancy forms</span></a></li>
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</ul>
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<h4>Requirements</h4>
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<div> <b>Header:</b> <a href="../headers/repetition/repeat.html"><boost/preprocessor/repetition/repeat.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div>
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<pre>#include <<a href="../headers/arithmetic/inc.html">boost/preprocessor/arithmetic/inc.hpp</a>>
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#include <<a href="../headers/punctuation/comma_if.html">boost/preprocessor/punctuation/comma_if.hpp</a>>
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#include <<a href="../headers/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>>
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#define TEXT(z, n, text) <a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) text
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#define TEMPLATE(z, n, _) \
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<a href="comma_if.html">BOOST_PP_COMMA_IF</a>(n) \
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template< \
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<a href="repeat_z.html">BOOST_PP_REPEAT_</a> ## z( \
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<a href="inc.html">BOOST_PP_INC</a>(n), \
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TEXT, class \
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) \
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> class T ## n \
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/**/
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<a href="repeat.html">BOOST_PP_REPEAT</a>(3, TEMPLATE, 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;"> <i><EFBFBD> Copyright <a href="http://www.housemarque.com"
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target="_top">Housemarque Oy</a> 2002</i> <br>
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<i><EFBFBD> Copyright Paul Mensonides 2002<br>
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</i><i><EFBFBD> Copyright Edward Diener 2014</i><br>
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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>
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or copy at <a href="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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