Re: [boost] Possible bug with mpl::joint_view working on two mpl::maps

From: Martin Apel (martin.apel_at_[hidden])
Date: 2007-08-16 02:57:36

Steven Watanabe wrote:
> AMDG
>
> Martin Apel <martin.apel <at> simpack.de> writes:
>
>   
>> I still had no luck getting this to work. It seems that the typedef for
>> the joint map is OK (I had to change the insert to use a third
>> parameter as follows:
>>
>> typedef copy<
>>    joint_view<Map1,Map2>,
>>    inserter <map0<>, insert<_1, end<_1>::type, _2> >
>>     
>>> ::type JointMap;
>>>       
>> otherwise it wouldn't compile).
>> However as soon as I try to access the result using
>>
>>    std::cout << at<JointMap, int_<2> >::type::value << "\n";
>>
>> I got tons of compile errors, from at_impl.hpp like the following:
>> <snip>
>>     
>
> try
>
>   typedef copy<
>      joint_view<Map1,Map2>,
>      inserter <map0<>, insert<_1, end<_1>, _2> >
>   >::type JointMap;
>
> In Christ,
> Steven Watanabe
>
>   
Sorry for the long delay. I was lucky to have a bank holiday yesterday
here in southern Germany :-)
I tried your minor correction. However it still gives me the same
compile errors when instantiating "at":

/usr/include/boost/mpl/next_prior.hpp:31: error: no type named `next' in
`struct mpl_::void_'
/usr/include/boost/mpl/aux_/at_impl.hpp:35: error: no type named `type'
in `struct boost::mpl::advance<mpl_::void_, mpl_::int_<2> >'

The line causing this looks as follows:
   std::cout << at<JointMap, int_<2> >::type::value << "\n";

Best Regards,

Martin

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