BOOST_PP_LIST_FOR_EACH_I_R

Boost , ,

Usage

Arguments

r

The next available BOOST_PP_FOR repetition.

macro

A macro of the for macro(r, data, i, elem).  This macro is expanded by BOOST_PP_LIST_FOR_EACH_I with each element in list.  It is expanded with the next available BOOST_PP_FOR repetition, the auxiliary data, the index of the current element, and the current element.

data

Auxiliary data passed to macro.

list

The list for which macro will be invoked on each element.

Remarks

See Also

• BOOST_PP_LIST_FOR_EACH_I

Requirements

Sample Code

#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/list/adt.hpp>
#include <boost/preprocessor/list/for_each_i.hpp>
#include <boost/preprocessor/repetition/for.hpp>
#define LIST (x, (y, (z, BOOST_PP_NIL)))
#define MACRO_2(r, data, i, elem) BOOST_PP_CAT(elem, i)
#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_I_R(r, MACRO_2, _, state) ]
BOOST_PP_FOR(LIST, PRED, OP, MACRO)
   // expands to [x0 y1 z2] [y0 z1] [z0]

Статья BOOST_PP_LIST_FOR_EACH_I_R раздела может быть полезна для разработчиков на c++ и boost.

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