"Delfin Rojas" <drojas@moodlogic.com> wrote
What I'm trying to do is make a variant that is a superset of another variant. For that, I make an initial mpl sequence with the types of the first variant and create it. Then I make a second list with the extra types of the second variant. I would then like to create the second variant passing the joint list of the first types sequence and second types sequence. That is why I wanted to use joint_view. Then I thought I would just push_back each of the second variant types to the first types sequence but that failed too. Finally I am doing an insert at the end (essentially a push_back but not quite).
If you just need to concatenate two sequences, you can use fold_backward and push_front, something like: template<class V1, class V2> struct concatenate : mpl::fold_backward< V1, V2, mpl::push_front<_,_> // please verify this -- not sure about the order -- may be <_2, _1>
{};
HTH, Arkadiy