[Boost-users] Mpl problem

Hi there, I am having a problem with the mpl library and I wonder if someone could help me with it. Basically I am trying to get a joint_view of two mpl::vector types and I get an error message on mpl/clear.hpp saying clear_traits< Tag > ::template algorithm< Sequence > base class undefined. I tried including several of the mpl hpp files, the ones that seemed could have something to do with this problem but that didn't help. I also get a similar problem trying to use mpl::push_back. In this case I get push_back_traits< Tag > ::template algorithm< Sequence,T > Base class undefined. On the other hand mpl::push_front and mpl::insert compile beautifully. Any ideas? Thanks -delfin