RE: [boost] [MPL] is_sequence problem

From: Brian Braatz (brianb_at_[hidden])
Date: 2005-05-05 22:52:00

Could it be as simple as missing the namespace on the is_sqeuence<>
call?

> -----Original Message-----
> From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]]
> On Behalf Of Joel
> Sent: Thursday, May 05, 2005 5:46 PM
> To: boost_at_[hidden]
> Subject: [boost] [MPL] is_sequence problem
> 
> Hi,
> 
> I have a problem with this code snippet:
> 
>      #include <boost/mpl/is_sequence.hpp>
> 
>      int
>      main()
>      {
>          using boost::mpl::int_;
>          using boost::mpl::is_sequence;
>          bool b = is_sequence<int_<0> >::value;
>      }
> 
> VC7.1 complains:
> 
> C:\dev\boost\boost\mpl\aux_\begin_end_impl.hpp(35) : error C2039:
> 'begin' : is not a member of 'boost::mpl::int_<N>'
>          with
>          [
>              N=0
>          ]
>          C:\dev\boost\boost\mpl\begin_end.hpp(35) : see reference to
> class template instantiation
> 'boost::mpl::begin_impl<Tag>::apply<Sequence>' being compiled
>          with
>          [
>              Tag=boost::mpl::begin<boost::mpl::int_<0>>::tag_,
>              Sequence=boost::mpl::int_<0>
>          ]
>          C:\dev\boost\boost\mpl\is_sequence.hpp(94) : see reference to
> class template instantiation 'boost::mpl::begin<Sequence>' being
compiled
>          with
>          [
>              Sequence=boost::mpl::int_<0>
>          ]
>          C:\dev\test\mpl_is_sequence.cpp(8) : see reference to class
> template instantiation 'boost::mpl::is_sequence<T>' being compiled
>          with
>          [
>              T=boost::mpl::int_<0>
>          ]
> C:\dev\boost\boost\mpl\aux_\begin_end_impl.hpp(35) : error C2955:
> 'boost::mpl::begin' : use of class template requires template argument
> list
>          C:\dev\boost\boost\mpl\begin_end.hpp(38) : see declaration of
> 'boost::mpl::begin'
> C:\dev\boost\boost\mpl\begin_end.hpp(35) : error C2955:
> 'boost::mpl::begin' : use of class template requires template argument
> list
>          C:\dev\boost\boost\mpl\begin_end.hpp(38) : see declaration of
> 'boost::mpl::begin'
> C:\dev\boost\boost\mpl\is_sequence.hpp(94) : error C3203: 'begin' :
> class template invalid as template argument for template parameter
'T',
> expected a real type
>  >Exit code: 2
> 
> Any hints? I am relying on is_sequence to return false in this case.
> Comeau and g++ throws up too.
> 
> Regards,
> --
> Joel de Guzman
> http://www.boost-consulting.com
> http://spirit.sf.net
> 
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