From: "David Abrahams" <dave@[...].com> 
>  
>  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();
};
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