The BOOST_PP_LIST_ENUM_R macro converts a list to a comma-separated list.  It reenters BOOST_PP_FOR with maximum efficiency.

Usage

BOOST_PP_LIST_ENUM_R(r, list)

Arguments

r
The next available BOOST_PP_FOR repetition.
list
The list to be converted.

Remarks

If list is, for example, (a, (b, (c, BOOST_PP_NIL))), this macro will produce:
a, b, c

See Also

Requirements

Header:  <boost/preprocessor/list/enum.hpp>

Sample Code

#include <boost/preprocessor/list/adt.hpp>
#include <boost/preprocessor/repetition/for.hpp>
#include <boost/preprocessor/list/enum.hpp>

#define LIST (x, (y, (z, BOOST_PP_NIL)))

#define PRED(r, state) BOOST_PP_LIST_IS_CONS(state)
#define OP(r, state) BOOST_PP_LIST_REST(state)
#define MACRO(r, state) [ BOOST_PP_LIST_ENUM_R(r, state) ]

BOOST_PP_FOR(LIST, PRED, OP, MACRO)
   // expands to [x, y, z] [y, z] [z]
© 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)