The BOOST_PP_ENUM_TRAILING macro generates a comma-separated list with a leading comma.

Usage

BOOST_PP_ENUM_TRAILING(count, macro, data)

Arguments

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 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 comma-separated sequence:
, macro(z, 0, data), 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_TRAILING_z.

See Also

Requirements

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

Sample Code

#include <boost/preprocessor/repetition/enum_trailing.hpp>

#define TEXT(z, n, text) text

template<class BOOST_PP_ENUM_TRAILING(3, TEXT, class)>
class X { };
/*
   expands to...

template<class, class, class, class>
class X { };
*/
© 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)