BOOST_PP_LIST_TO_TUPLE_R

Boost , ,

Usage

Arguments

r

The next available BOOST_PP_FOR repetition.

list

The list to be converted.

Remarks

    Если list является, например, (a, (b, (c, BOOST_PP_NIL)), этот макрос будет производить:

   If the list to be converted is empty, as represented by 'BOOST_PP_NIL', the resulting tuple is undefined since a tuple cannot be empty.

See Also

• BOOST_PP_LIST_TO_TUPLE

Requirements

Sample Code

#include <boost/preprocessor/list/adt.hpp>
#include <boost/preprocessor/list/to_tuple.hpp>
#include <boost/preprocessor/repetition/for.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_TO_TUPLE_R(r, state)
BOOST_PP_FOR(LIST, PRED, OP, MACRO)
   // expands to (x, y, z) (y, z) (z)

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

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