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## Struct template complement

boost::proto::complement — A metafunction for generating complement expression types, a grammar element for matching complement expressions, and a PrimitiveTransform that dispatches to the `proto::pass_through<>` transform.

## Synopsis

    // In header: <boost/proto/traits.hpp>

    template<typename T>
    struct complement :  proto::transform< complement<T> > {
      // types
      typedef proto::expr< proto::tag::complement, proto::list1< T > > type;
      typedef type                                                     proto_base_expr;
      template<typename Expr, typename State, typename Data>
      struct impl :
         proto::pass_through<complement>::template impl<Expr, State, Data>
      {
      };
    };

## Description