Re: [Boost-users] Using Fusion adapted struct with mpl::is_sequence

Subject: Re: [Boost-users] Using Fusion adapted struct with mpl::is_sequence
From: Joel de Guzman (joel_at_[hidden])
Date: 2009-12-14 21:45:42

Christopher Schmidt wrote:
> John Smith schrieb:
> [snip]
>> which works fine.  However, I pass the adapted struct to my MPL
>> algorithm and it seems to always return false on mpl::is_sequence.  If
>> I typedef boost::fusion::fusion_sequence_tag tag in the struct, then it
>> all works, also if I pass in a proper fusion sequence, then that works
>> as well.  I was wondering if there was a different way of doing things,
>> I don't really want to require the tag to be typedef'ed in the structure.
> 
> This is a bug. Fusion should provide a specialized implementation of
> mpl::sequence_tag for adapted structures. Please file a bug report.

FWIW, MPL Forward Sequence concept does not have this requirement.
Nor do any of its more specialized concepts. So technically, it is not
a bug, IMO.

http://www.boost.org/doc/libs/1_41_0/libs/mpl/doc/refmanual/forward-sequence.html

REgards,
-- 
Joel de Guzman
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