Re: [boost] [fusion] implementing distance_impl<>

From: dan marsden (danmarsden_at_[hidden])
Date: 2007-06-07 02:31:10

>Eric Niebler wrote:

>But now there is code in
>algorithm/iteration/detail/for_each.hpp like this:
>
>   for_each_unrolled<
>     result_of::distance<begin, end>::value
>   >::call(fusion::begin(seq), f);
>
>The problem is with distance<begin, end>::value. My distance_impl<>
>doesn't provide a nested value. It provides a nested type. If this were
>distance<begin, end>::type::value, it works. It also works if I change
>my distance_impl<> specialization, but I don't think I should have to. Bug?

>From what I can see in the MPL docs, a numeric metafunction is only required to
return ::type, and ::value is just a convenience that I shouldn't count on. So
I agree, a bug. I'll patch up shortly, thanks for picking this up.

Cheers

Dan

                
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