The BOOST_PP_ENUM_SHIFTED macro generates a comma-separated, shifted list.


BOOST_PP_ENUM_SHIFTED(count, macro, data)


The number of repetitious calls to macro.  Valid values range from 0 to BOOST_PP_LIMIT_REPEAT.
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. 
Auxiliary data passed to macro.


This macro expands to the comma-separated sequence:
macro(z, 1, data), ... macro(z, count - 1, data)
The z value that is passed to macro represents the next available repetition dimension.  Other macros that have _Z suffix variants internally use BOOST_PP_REPEAT--for example, BOOST_PP_ENUM_PARAMS and BOOST_PP_ENUM_PARAMS_Z.  Using these _Z versions is not strictly necessary, but passing the z value (that is passed to macro) to these macros allows them to reenter BOOST_PP_REPEAT with maximum efficiency.
To directly use this z value, rather than simply passing it to another macro, see BOOST_PP_ENUM_SHIFTED_z.
Previously, this macro could not be used recursively inside BOOST_PP_REPEAT.  This limitation no longer exists, as the library can automatically detect the next available repetition depth.

See Also


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

Sample Code

#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_shifted.hpp>

#define TYPE(z, n, type) type

BOOST_PP_ENUM(5, TYPE, int) // expands to int, int, int, int, int
BOOST_PP_ENUM_SHIFTED(5, TYPE, int) // expands to int, int, int, int

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