BOOST_PP_LIST_FOR_EACH_R

The BOOST_PP_LIST_FOR_EACH_R macro repeats a macro for each element in a list. It reenters BOOST_PP_FOR with maximum efficiency.

#### Usage

BOOST_PP_LIST_FOR_EACH_R(r, macro, data, list)

#### Arguments

r
  The next available BOOST_PP_FOR repetition.
macro
  A ternary macro of the form macro(r, data, elem). This macro is expanded by BOOST_PP_LIST_FOR_EACH with each element in list. It is expanded with the next available BOOST_PP_FOR repetition, the auxiliary data, and the current element.
data
  Auxiliary data passed to macro.
list
  The list for which macro will be invoked on each element.

#### Remarks

This macro is a repetition construct. If list is (a, (b, (c, BOOST_PP_NIL))), it expands to the sequence:
macro(r, data, a) macro(r, data, b) macro(r, data, c)

#### See Also

- BOOST_PP_LIST_FOR_EACH

#### Requirements

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

#### Sample Code

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

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

    #define MACRO_2(r, data, elem) elem

    #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_FOR_EACH_R(r, MACRO_2, _, 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)