[boost] Suggested extension to the preprocessor library

From: Ryan Saunders (rls_at_[hidden])
Date: 2004-12-01 02:50:40

Hi,

I've been using the preprocessor library quite extensively in my code, and 
have a suggested addition to it.

I use the BOOST_PP_ENUM_XXX macros for rapidly creating lists of identical 
template parameters. For example, instead of

     template <typename T0, typename T1, typename T2, typename T3>

I can just use

     template <ENUM_PARAMS(3, typename T)>

I notice that there's also a "binary" version that takes two parts and 
suffixes the count onto each part. The problem I'm faced with is that I'm 
trying to construct parameter lists to other templates, but the actual 
parameters are embedded typedefs in the enumerated parameters. I know that 
was dense -- here's an example:

     typedef typename meta_func< typename T0::inner_type, typename 
T1::inner_type, typename T2::inner_type>::type;

I don't see a way to do this with any of the ENUM_XXX macros. Maybe something 
like ENUM_SPLIT_PARAMS(COUNT, PREF, SUFF) that would generate
PREF ## n ## SUFF?

Thanks,
Ryan