Method ok_if_can_harvest

battlecode-engine/src/world.rs:1210–1219

(&self, worker_id: UnitID, direction: Direction)

    // ************************************************************************

    fn ok_if_can_harvest(&self, worker_id: UnitID, direction: Direction) -> Result<(), GameError> {
        let unit = self.my_unit(worker_id)?;
        unit.ok_if_can_worker_act()?;
        let harvest_loc = unit.location().map_location()?.add(direction);
        // Check to see if we can sense the harvest location, (e.g. it is on the map).
        if self.karbonite_at(harvest_loc)? == 0 {
            Err(GameError::KarboniteDepositEmpty)?;
        }
        Ok(())
    }

    /// Whether the worker is ready to harvest, and the given direction contains
    /// karbonite to harvest. The worker cannot already have performed an action