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boost::proto::_default — A PrimitiveTransform that gives expressions their usual C++ behavior
// In header: <boost/proto/transform/default.hpp>
template<typename Grammar = unspecified> 
struct _default :  proto::transform< _default<Grammar> > {
  // member classes/structs/unions
  template<typename Expr, typename State, typename Data> 
  struct impl :  proto::transform_impl<Expr, State, Data> {
    // types
    typedef typename Expr::tag_type Tag;          // For exposition only
    typedef see-below               result_type;
    // public member functions
    result_type operator()(typename impl::expr_param, 
                           typename impl::state_param, 
                           typename impl::data_param) const;
    // public data members
    static Expr s_expr;    // For exposition only
    static State s_state;    // For exposition only
    static Data s_data;    // For exposition only
  };
};
            For the complete description of the behavior of the proto::_default
            transform, see the documentation for the nested 
              proto::_default::impl<>
             class template.
          
            When used without specifying a Grammar parameter,
            proto::_default behaves as if the parameter were
            proto::_default<>.