-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Jason Hise
I am trying to generate these using the boost preprocessor library, but I am getting an error. This is probably because I do not fully understand how the order of expansion of function-like macros works. The error is: warning C4002: too many actual parameters for macro 'BOOST_PP_IIF_1'
My code is as follows:
#define BOOST_PP_LOCAL_LIMITS (0, BOOST_SINGLETON_PTR_MAX_CONSTRUCTOR_PARAMS) #define BOOST_PP_LOCAL_MACRO(n) \ BOOST_PP_IF(n, template < BOOST_PP_ENUM_PARAMS(n, typename P)
, \ BOOST_PP_EMPTY())
Two problems here... IF forwards its arguments to IIF, however, before it can do so, 1) ENUM_PARAMS is creating 'n' arguments and 2) EMPTY() is expanding to nothing. This definitely won't work. You need something like: IF(n, template < ENUM_PARAMS, TUPLE_EAT(2))(n, typename P) EXPR_IF(n, >)
void create ( BOOST_PP_ENUM_BINARY_PARAMS(n, \ typename ::boost::call_traits < P, >::param_type p ) ) \ { \ policy_ptr->get_creator ( )->create \ ( BOOST_PP_ENUM_PARAMS(n, p) ); \ } #include BOOST_PP_LOCAL_ITERATE()
What am I doing wrong?
The better way to go, IMO, is to take the non-template special case out of the generation algorithm--which simplies it. E.g. void create() { policy_ptr->get_creater()->create(); } #define LOCAL_LIMITS (1, MAX_PARAMS) #define LOCAL_MACRO(n) \ template< ENUM_PARAMS(n, typename P) > \ void create( \ ENUM_BINARY_PARAMS( \ n, \ typename ::boost::call_traits<P, >::param_type p \ ) \ ) \ { \ policy_ptr->get_creater()->create( \ ENUM_PARAMS(n, p) \ ); \ } \ /**/ #include LOCAL_ITERATE() Is there more to this code than what you actually have here? It seems like there should be. Regards, Paul Mensonides