Re: [boost][MPL] Numeric metafunctions protocol/infrastructure

From: Cromwell Enage (sponage_at_[hidden])
Date: 2004-09-18 09:46:20

--- Aleksey Gurtovoy <agurtovoy_at_[hidden]> wrote:
> Something like this should be enough:
> 
>     struct fraction_c_tag : int_<20> {};
> 
>     template<> struct numeric_cast<
>       integral_c_tag,fraction_c_tag >
>     {
>         template< typename N > struct apply
>             : fraction_c<
>                 typename N::value_type,N::value,1 >
>             {
>             };
>     };

Alas, no.  I hadn't tried inheritance/nested
forwarding for the sake of portability before looking
at your message, opting instead to typedef ... type in
the struct body.  (Now I'm using
BOOST_MPL_CFG_NO_NESTED_FORWARDING to branch out the
code.)  Either way it still didn't work without my
macros.  :(

The other major issue I have is that the big_integral
examples are taking longer to compile than before.  In
fact, it takes too long for even one division
operation.  But that can wait until after the release.

                              Cromwell Enage

                
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