[boost] [preprocessor] help generating create functions

From: Jason Hise (chaos_at_[hidden])
Date: 2005-09-14 00:42:27

Background: I am using a few functions which have the following form:

void create (  );

template < typename P1 >
void create ( P1 p1 );

template < typename P1, typename P2 >
void create ( P1 p1, P2 p2 );
[...]

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()) 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?

-Jason