Struct template negate

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## Struct template negate

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

## Synopsis

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

## Description