###

# Boost.Preprocessor

## Reference

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# #include <boost/preprocessor/list/fold_right.hpp>

## #define BOOST_PP_LIST_FOLD_RIGHT(OP,LIST,STATE)

Iterates `OP(D,X,STATE)` for each element `X` of the list `LIST` (from the right or the end of the list).

In other words, expands to:

      OP
      ( D
      , BOOST_PP_LIST_AT(LIST,0)
      , ... OP
            ( D
            , BOOST_PP_LIST_AT(LIST,BOOST_PP_SUB(BOOST_PP_LIST_SIZE(LIST),2))
            , OP
              ( D
              , BOOST_PP_LIST_AT(LIST,BOOST_PP_SUB(BOOST_PP_LIST_SIZE(LIST),1))
              , STATE
              )
            ) ...
      )

For example,

      #define TEST(D,X,STATE) BOOST_PP_CAT(STATE,X)
      BOOST_PP_LIST_FOLD_RIGHT(TEST,_,BOOST_PP_TUPLE_TO_LIST(3,(A,B,C)))

expands to:

      _CBA

### Uses

- BOOST_PP_WHILE() (see for explanation of the D parameter)
- BOOST_PP_LIST_FOLD_LEFT()

### Test

- list_test.cpp

## #define BOOST_PP_LIST_FOLD_RIGHT_D(D,OP,LIST,STATE)

Can be used inside BOOST_PP_WHILE().

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Revised

© Copyright Housemarque Oy 2002

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