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boost::proto::data_type — 
          The type of proto::data, a key for use when creating
          a transform environment that associates a piece of data with this type.
        
// In header: <boost/proto/transform/env.hpp> struct data_type { // public member functions template<typename Value> env<data_type,see-below> operator=(Value &) const; template<typename Value> env<data_type,see-below> operator=(Value const &) const; };
            The proto::data_type type, along with the proto::data
            global, are declared using the BOOST_PROTO_DEFINE_ENV_VAR() macro.
          
data_type public member functionstemplate<typename Value> env<data_type,see-below> operator=(Value & value) const; template<typename Value> env<data_type,see-below> operator=(Value const & value) const;
                If Value is a specialization boost::reference_wrapper<T>,
                this function returns env<data_type, T &>(value.get()).
              
                Else, if the type Value is non-copyable (i.e., a function, an array, abstract, or an ostream),
                this function returns env<data_type, Value ,
                where cv &>(value)cvconst for the second overload, and empty
                for the first.
              
                Otherwise, this function returns env<data_type, Value>(value).