Re: [Boost-users] [multi_index] MSVS 2005 visualizers?

From: Filip Konvička (filip.konvicka_at_[hidden])
Date: 2007-05-28 08:04:51

>> So I tried next_, but I got garbage
>> again, but this time it is not 0xcdcdcdcd but something a bit different.
>> I have inserted a "1" into the container, so I'd expect that the buffer
>> contained [0x01 0x00 0x00 0x00].
>>
>> See screenshot - the expression shown is (sorry :-)))
>>     
> I'm not 100% sure, but I think you're not getting the casts right --if I'm
> interpreting the expression correctly, you are applying the following casts
> to the next_ pointer:
>
>   a) to boost::multi_index::detail::sequenced_index_node_trampoline<
>     boost::multi_index::detail::index_node_base<int>  >*
>   b) to boost::multi_index::detail::sequenced_index_node_impl*
>   c) to boost::multi_index::detail::index_node_base<int>*
>   
Actually, not. I was simply drag&dropping the next_ pointer so that the 
watch window derived the casts (it needs all explicit template 
parameters, hence the mpl::na everywhere). The only cast I was doing was 
the

boost::multi_index::detail::index_node_base<int>*

cast of the next_ pointer, which, as it seems, is not enough.
> That is, if x is of type sequenced_index_node_impl you get to the
> full node by evaluating:
>
> (boost::multi_index::detail::index_node_base<int>*)
> (boost::multi_index::detail::sequenced_index_node<
> boost::multi_index::detail::index_node_base<int> >*)
> (boost::multi_index::detail::sequenced_index_node_trampoline<
> boost::multi_index::detail::index_node_base<int>  >*)x
>   
When I applied the above-mentioned casts to the next_ pointer, I saw the 
int!! :-) I even tried substituting "next_" with "next_->next_" and I 
saw the other elements.

The entire watch window expression to view the first element of the 
container is:

(int&)((((*(boost::multi_index::detail::pod_value_holder<int>*)(&*(boost::multi_index::detail::index_node_base<int>*)(boost::multi_index::detail::sequenced_index_node<boost::multi_index::detail::index_node_base<int> 
 >*)(boost::multi_index::detail::sequenced_index_node_trampoline<boost::multi_index::detail::index_node_base<int> 
 >*)((*(boost::multi_index::detail::sequenced_index_node_impl*)(boost::multi_index::detail::sequenced_index_node_trampoline<boost::multi_index::detail::index_node_base<int> 
 >*)((*(boost::multi_index::detail::header_holder<boost::multi_index::detail::sequenced_index_node<boost::multi_index::detail::index_node_base<int> 
 >,boost::multi_index::multi_index_container<int,boost::multi_index::indexed_by<boost::multi_index::sequenced<boost::multi_index::tag<boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na> 
 >,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,std::allocator<int> 
 > >*)(&x)).member)).next_)))).space).data_).buf

Thanks for now! Now I'll try to make a visualizer for this container and 
see if that can be extended to other containers.

Cheers,
Filip