Hi,
I'm using Boost.Preprocessor to create specializations of a class I have
named InputSource. in the iteration loop, I have the following:
# define i BOOST_PP_ITERATION()
# define INPUT_repeat(z, n, user) user
template
class InputSource<
t_return,
BOOST_PP_ENUM_PARAMS(i, t_param)
BOOST_PP_COMMA_IF( BOOST_PP_AND(BOOST_PP_NOT_EQUAL(i, 0),
BOOST_PP_NOT_EQUAL(i, MAX_PARAMETERS)) )
BOOST_PP_ENUM(BOOST_PP_SUB(MAX_PARAMETERS, i), INPUT_repeat,
detail::no_param)
>
The part that isn't working is the BOOST_PP_COMMA_IF line. When I look at
the preprocessor output generated by MSVC9, I get this:
template
class InputSource<
t_return,
t_param0
BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_BITAND_BOOST_PP_BOOL_BOOST_PP_NOT_EQUAL(1,
0)BOOST_PP_BOOL_BOOST_PP_NOT_EQUAL(1, 5)(BOOST_PP_COMMA, BOOST_PP_EMPTY)()
detail::no_param , detail::no_param , detail::no_param ,
detail::no_param
>
My iteration limits has been defined as follows:
# ifndef MAX_PARAMETERS
# define MAX_PARAMETERS 5
# endif
# define BOOST_PP_ITERATION_LIMITS (1, MAX_PARAMETERS)
I would have expected the preprocessor to show a comma or a blank line, but
instead it looks like some macros were not expanded. Any solutions to this
problem?
