BOOST_PP_ENUM_SHIFTED_z

The BOOST_PP_ENUM_SHIFTED_z macro represents a reentry into the BOOST_PP_ENUM_SHIFTED repetition construct.

#### Usage

BOOST_PP_ENUM_SHIFTED_ ## z(count, macro, data)

#### Arguments

z
  The next available BOOST_PP_REPEAT dimension.
count
  The number of repetitious calls to macro. Valid values range from 0 to BOOST_PP_LIMIT_REPEAT.
macro
  A ternary operation of the form macro(z, n, data). This macro is expanded by BOOST_PP_ENUM_SHIFTED with the next available repetition depth, the current repetition number, and the auxiliary data argument.
data
  Auxiliary data passed to macro.

#### Remarks

This macro expands to the sequence:
macro(z, 1, data), ... macro(z, count - 1, data)
At certain times, it may be necessary to perform the concatenation with BOOST_PP_CAT rather than the preprocessor token-pasting operator. This happens when the z value is a macro invocation itself. It needs a delay to allow it to expand. The syntax in such a scenario becomes:
BOOST_PP_CAT(BOOST_PP_ENUM_SHIFTED_, z)(count, macro, data).

#### See Also

- BOOST_PP_CAT
- BOOST_PP_ENUM_SHIFTED
- BOOST_PP_LIMIT_REPEAT

#### Requirements

Header: <boost/preprocessor/repetition/enum_shifted.hpp>

#### Sample Code

    #include <boost/preprocessor/arithmetic/inc.hpp>
    #include <boost/preprocessor/repetition/enum_shifted.hpp>
    #include <boost/preprocessor/repetition/repeat.hpp>

    #define TEXT(z, n, text) text

    #define MACRO(z, n, data) \
       ( \
          BOOST_PP_ENUM_SHIFTED_ ## z( \
             BOOST_PP_INC(n), \
             TEXT, data \
          ) \
       ) \
       /**/

    BOOST_PP_REPEAT(3, MACRO, class) // expands to () (class) (class, class)

© 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)