Re: [boost] Re: MPL usage for code generation

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-01-23 06:43:47

From: "David Abrahams" <dave_at_[hidden]>
> 
> I've been talking with Aleksey recently about how to improve the
> syntactic situation without losing the separation of concerns that we
> get, but we didn't come up with anything convincingly better.  I think
> a long time ago the for_each parameter used to look like:
> 
>     class f
>     {
>         template <class T>
>         struct apply
>         {
>             static void execute() {...};
>         };
>     };
> 
> IOW, a metafunction class with a nested 'execute' function.  However
> that's not really any better syntactically, it has problems carrying
> state, and it's anti-idiomatic.

The state problem is easy:

struct F
{
    template<class T> void execute();
};