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boost::proto::shift_left — A metafunction for generating left-shift expression types,
          a grammar element for matching left-shift expressions, and
          a PrimitiveTransform that dispatches to the
          proto::pass_through<>
          transform.
// In header: <boost/proto/traits.hpp> template<typename T, typename U> struct shift_left : proto::transform< shift_left<T, U> > { // types typedef proto::expr< proto::tag::shift_left, proto::list2< T, U > > type; typedef proto::basic_expr< proto::tag::shift_left, proto::list2< T, U > > proto_grammar; // member classes/structs/unions template<typename Expr, typename State, typename Data> struct impl : proto::pass_through<shift_left>::template impl<Expr, State, Data> { }; };