void sensor_event(unsigned, bool);
void block_reserved(const R2C2::Block &, const R2C2::Train *);
R2C2::Object *pick_object(const R2C2::Vector &);
void sensor_event(unsigned, bool);
void block_reserved(const R2C2::Block &, const R2C2::Train *);
R2C2::Object *pick_object(const R2C2::Vector &);