如何引用结构字符串成员？

Question

I've struct:

struct User {
~User();
Datacratic::Id id;                     ///< Exchange-specific user ID
Datacratic::Id buyeruid;               ///< Exchange seat-specific user ID
Datacratic::TaggedInt yob;             ///< Year of birth
std::string gender;             ///< Gender: Male, Female, Other
Datacratic::CSList keywords;           ///< List of keywords of consumer intent
Datacratic::UnicodeString customdata;         ///< Custom data from exchange
Datacratic::Optional<Geo> geo;                   ///< Geolocation of user at registration
std::vector<Data> data;         ///< User data segments
Json::Value ext;   
}

When I reference gender by user.gender , it says:

error: âstruct Datacratic::Optional<OpenRTB::User>â has no member named âgenderâ
         result->segments.addStrings("gender", result->user.gender);

Thanks, Ann

Answer 1

From the compiler error it looks to me like result->user is of type OpenRTB::User , which may be distinct from your struct User class. So you to either make result->user of your type User , or extend the OpenRTB::User class and add your additional fields. You could then access your fields from a OpenRTB::User * by making a dynamic cast to User * .