virtual ~USERS() {}
virtual int FindByName(const std::string & login, USER_PTR * user) = 0;
virtual int FindByName(const std::string & login, CONST_USER_PTR * user) const = 0;
+ virtual bool Exists(const std::string & login) const = 0;
virtual bool TariffInUse(const std::string & tariffName) const = 0;