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

Gottlob Frege wrote:

On 1/19/07, *Tobias Schwinger* mailto:tschwinger@isonews2.com> wrote:

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...

Is there / should there be a base class that fusion sequences should derive from to ensure some of the fundamentals are there?

Yes, there is. But it's provided only to make life easier. It is not required. The class is sequence_facade (in fusion/sequence/). It is a fairly recent addition, however, and is not documented nor tested yet. I believe it is not yet ready for prime time, unlike its counterpart iterator_facade which is already deployed to adapt a couple of non-native iterators (e.g. std::pair, boost:: array, boost::tuple, etc.). If anyone wants to proceed with its development, email me privately. It's a fairly simple adapter class. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net