Re: [boost] [fusion] tuple.hpp:get:at_meta? (was Re: [review] Fusion review begins

From: dan marsden (danmarsden_at_[hidden])
Date: 2006-05-03 14:54:47

> In boost/fusion/tuple/tuple.hpp there's this:
> 
>      get(Tuple& tup)
>      {
>          typedef result_of::at_c<Tuple, N> at_meta;
>          return extension::at_impl
>            <typename traits::tag_of<Tuple>::type
>            >::template apply<Tuple, mpl::int_<N> >::call(tup);
>      }
> 
> I don't see any use of the at_meta typedef.  What's the
> purpose of this typedef?

This appears to be the result of a bit of cut and paste from the at and at_c implementations, which
also have the redundant typedef. The get implementations should be calling at_c directly, rather than
implementing more tag_dispatching to the at_impl type themselves. I've tidied things up, removing the
redundant typedefs in both get and at, and modifying get to call at_c directly.

Thanks for pointing this one out.
Cheers
Dan