Re: [boost] [type_erasure] Using any with iterator Concept.

Subject: Re: [boost] [type_erasure] Using any with iterator Concept.
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2013-04-26 13:28:33

AMDG

On 04/26/2013 09:22 AM, Adam Wulkiewicz wrote:
> I'm trying to use type-erased iterator in STL algorithms, e.g. copy but
> get errors like this one:
> 
> error C2039: 'iterator_category' : is not a member of
> 'boost::type_erasure::any<Concept>'    c:\program files (x86)\microsoft
> visual studio 10.0\vc\include\xutility    373
> 
> of course any doesn't define iterator_category. I'm using MSVC2010 and
> doing something like this:
> 
> typedef boost::type_erasure::any<
>     boost::type_erasure::iterator<
>         boost::single_pass_traversal_tag
>     >
>> iterator;
> 
> <snip>
> 
> I simply tried to add it to the iterator<> Concept defined in
> iterator.hpp but this didn't help:
> 
> template<...>
> struct iterator< ::boost::single_pass_traversal_tag, ...> :
>     iterator< ::boost::incrementable_traversal_tag, ...>
> {
>     <snip>
>     typedef std::input_iterator_tag iterator_category;
> };
> 
> Am I doing something wrong or is it an error in Boost.TypeErasure?
> 

The code currently supports only forward_traversal_tag,
bidirectional_traversal_tag, and random_access_traversal_tag.

What needs to be added is another concept_interface
specialization.

In Christ,
Steven Watanabe