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src/economy/road.h
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        DISALLOW_COPY_AND_ASSIGN(RoadDescr);
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};
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// C++11 allows static constexpr members in the compiler, but the linker can't handle it.
 
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// So, we don't have these in the class.
 
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// https://stackoverflow.com/questions/40690260/undefined-reference-error-for-static-constexpr-member
 
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constexpr int32_t kRoadAnimalPrice = 600;
 
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constexpr int32_t kRoadMaxWallet = static_cast<int32_t>(2.5 * kRoadAnimalPrice);
 
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/**
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 * Road is a special object which connects two flags.
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 * The Road itself is never rendered; however, the appropriate Field::roads are
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        void postsplit(Game&, Flag&);
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        bool notify_ware(Game& game, FlagId flagid);
 
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        void update_wallet_chargetime(Game& game);
 
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        void charge_wallet(Game& game);
 
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        int32_t wallet() const;
 
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        void add_to_wallet(int32_t sum);
 
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        void pay_for_road(Game& game, uint8_t wares_count);
 
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        void pay_for_building();
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        void remove_worker(Worker&) override;
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        void assign_carrier(Carrier&, uint8_t);
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        static void
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        request_carrier_callback(Game&, Request&, DescriptionIndex, Worker*, PlayerImmovable&);
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        uint8_t carriers_count() const;
 
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private:
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        /// Counter that is incremented when a ware does not get a carrier for this
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        /// road immediately and decremented over time.
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        uint32_t busyness_;
 
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        int32_t wallet_;
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        /// holds the gametime when busyness_ was last updated
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        uint32_t busyness_last_update_;
 
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        /// holds the gametime when wallet_ was last charged
 
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        uint32_t last_wallet_charge_;
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        uint8_t type_;        ///< RoadType, 2 bits used
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        Flag* flags_[2];      ///< start and end flag