Re: [Boost-users] [Fusion] fusion::traits::is_sequence <->mpl::is_sequence?

From: Joel de Guzman (joel_at_[hidden])
Date: 2007-01-19 20:23:17

Tobias Schwinger wrote:

>> I guess you have to make sure that mpl::sequence_tag returns 
>> fusion::fusion_sequence_tag. An easy way to do it is to add a 'tag' type 
>> member.
>>
>>      struct my_seq
>>      {
>>          typedef fusion::fusion_sequence_tag tag;
>>          // ...
> 
> Sidenote: Although all Sequences provided by Fusion are MPL Sequences 
> (because of that 'tag' type member), it is possible to /write/ a Fusion 
> Sequence that is not an MPL Sequence by omitting that type member...

That supports my quick theories. For Sohail, who's doing a non-intrusive
adaptation, he'll need to specialize the mpl::sequence_tag.

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net