Re: [boost] [fusion] random access views?

From: dan marsden (danmarsden_at_[hidden])
Date: 2006-10-29 16:21:44

Eric Niebler wrote:
>A fusion transform_view of a random access sequence should itself be a
>random access sequence, and its category is random access, but it
>doesn't seem to implement the complete interface. For instance:
>
>struct plus1
>{
>     template<typename T> struct result { typedef T type; };
>     template<typename T> T operator ()(T const &t) const
>     {
>         return t + 1;
>     }
>};
>
>template<typename V>
>void bar(V const &v)
>{
>     boost::fusion::at_c<1>(v); // OK
>     boost::fusion::transform_view<V const, plus1> view(v, plus1());
>     boost::fusion::at_c<1>(view); // ERROR
>}
>
>int main()
>{
>     bar(boost::fusion::make_vector(1,2,3));
>     return 0;
>}
>
>
>I can't randomly access elements of a transformed fusion::vector. Bug?

The at_impl had been completed omitted. I've fixed this in the cvs, and added
covering tests.

Thanks for spotting this.

Cheers

Dan



		
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