Method field

Utilities/cmcppdap/src/jsoncpp_json_serializer.cpp:252–259

    FS(Json::Value* json) : json(json) {}
    bool field(const std::string& name, const SerializeFunc& cb) override {
      JsonCppSerializer s(&(*json)[name]);
      auto res = cb(&s);
      if (s.removed) {
        json->removeMember(name);
      }
      return res;
    }
  };

  *json = Json::Value(Json::objectValue);