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<title>BOOST_PP_DEDUCE_R</title>
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The <b>BOOST_PP_DEDUCE_R</b> macro manually deduces the state of the <b>BOOST_PP_FOR</b> construct.
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<h4>Usage</h4>
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<b>BOOST_PP_DEDUCE_R</b>()
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<h4>Remarks</h4>
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This macro is intended to avoid the use of <i>automatic-recursion</i> at deep expansion depths.
<i>Automatic-recursion</i> at such depths can be inefficient on some preprocessors.
It is not intended to be used directly with the invocation of macros with a <b>_R</b> suffix such as:
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<b>BOOST_PP_LIST_ENUM_R</b>(<b>BOOST_PP_DEDUCE_R</b>(), (a, (b, (c, <b>BOOST_PP_NIL</b>))))
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If it is used in this context, the <b>_R</b> macro will fail.
The <b>_R</b> macros directly concatenate to the <i>r</i> parameter that is passed to them,
which would prevent <b>BOOST_PP_DEDUCE_R</b>() from expanding.
Furthermore, it is pointless to use this macro in a situation such as this
because it would already be too late to gain any efficiency.
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<h4>See Also</h4>
<ul>
<li><a href="for.html">BOOST_PP_FOR</a></li>
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<h4>Requirements</h4>
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<b>Header:</b> <a href="../headers/repetition/deduce_r.html"><boost/preprocessor/repetition/deduce_r.hpp></a>
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<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>
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<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>
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