The BOOST_PP_DEDUCE_R macro manually deduces the state of the BOOST_PP_FOR construct.

Usage

BOOST_PP_DEDUCE_R()

Remarks

This macro is intended to avoid the use of automatic-recursion at deep expansion depths.  Automatic-recursion at such depths can be inefficient on some preprocessors.  It is not intended to be used directly with the invocation of macros with a _R suffix such as:
BOOST_PP_LIST_ENUM_R(BOOST_PP_DEDUCE_R(), (a, (b, (c, BOOST_PP_NIL))))
If it is used in this context, the _R macro will fail.  The _R macros directly concatenate to the r parameter that is passed to them, which would prevent BOOST_PP_DEDUCE_R() 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.

See Also

Requirements

Header:  <boost/preprocessor/repetition/deduce_r.hpp>

Copyright Housemarque Oy 2002
Copyright Paul Mensonides 2002

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt)