[Boost-users] [mpl][variant] Visitor with typelists

What is the best (shortest/most elegant) way to create a visitor for a Variant, where there are subsets of the variant types, for which the operation is the same? typedef boost::mpl::vector v1; typedef boost::mpl::vector v2; typedef boost::mpl::joint_view v; typedef boost::make_variant_over< v >::type v_union; struct visitor : public boost::static_visitor<int> { int operator()([T in v1] arg) { // do something for A, B, C return arg.a; } int operator()([T in v2] arg) { // do something for D, E return arg.b; } }; Thanks, Tilo