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<html>
<head>
<title>BOOST_PP_REPEAT_FROM_TO_z</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_REPEAT_FROM_TO_<i>z</i></b> macro represents a reentry into the <b>BOOST_PP_REPEAT_FROM_TO</b> repetition construct.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_REPEAT_FROM_TO_</b> ## <i>z</i>(<i>first</i>, <i>last</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>first</dt>
<dd>
The lower bound of the repetition.
Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
</dd>
<dt>last</dt>
<dd>
The upper bound of the repetition.
Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</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_REPEAT</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>first</i>, <i>data</i>) <i>macro</i>(<i>z</i>, <i>first</i> + <i>1</i>, <i>data</i>) ... <i>macro</i>(<i>z</i>, <i>last</i> - <i>1</i>, <i>data</i>)
</div>
</div>
<div>
The number of repetitions (i.e. <i>last</i> - <i>first</i>) must not exceed <b>BOOST_PP_LIMIT_REPEAT</b>.
</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_REPEAT_FROM_TO_</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="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li>
<li><a href="repeat.html">BOOST_PP_REPEAT</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> <a href="../headers/repetition/repeat_from_to.html"><boost/preprocessor/repetition/repeat_from_to.hpp></a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include <<a href="../headers/repetition/repeat_from_to.html">boost/preprocessor/repetition/repeat_from_to.hpp</a>>
#define TEXT(z, n, data) n data
#define MACRO(z, n, data) \
( \
<a href="repeat_from_to_z.html">BOOST_PP_REPEAT_FROM_TO_</a> ## z( \
1, 4, \
TEXT, xyz \
) \
) \
/**/
<a href="repeat.html">BOOST_PP_REPEAT</a>(3, MACRO, _)
/*
expands to:
(1 xyz 2 xyz 3 xyz)
(1 xyz 2 xyz 3 xyz)
(1 xyz 2 xyz 3 xyz)
*/
</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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