Tobias Schwinger wrote:
Joel de Guzman wrote:
Hi,
In the variant docs, in the make_variant_over section (Using a type sequence to specify bounded types), it is not clear what MPL sequence concept it is referring to.
I was hoping it is a Forward Sequence, but I realized that when I try to use make_variant_over with a Forward Sequence, it fails trying to use mpl::clear, which hints that make_variant_over requires an MPL Extensible Sequence. This is rather undesirable. Is there a reason why this is so? Can't we lessen the requirement? The situation makes it not possible to use mpl views or fusion views for example.
Well, one could slowly but surely create an extensible sequence with mpl::copy.
Yeah, that's more or less what I do, for now.
I had a quick take at this one to make things work without wasting compile time, see attached patch (tested with GCC4).
Thanks! Now, I'll just wait for the variant author(s) to pick this up. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net