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## car_rental |
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### Instructions |
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Create a struct named `Car` and another one named `RentalBusiness`. |
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The scope of the exercise will be to modify and operate on the `Car` in the `RentalBusiness` even if this element is not declared as mutable. |
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### Expected Functions and Structures |
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```rust |
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use std::cell::Ref; |
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use std::cell::RefCell; |
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use std::cell::RefMut; |
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#[derive(Debug, Default, PartialEq, Eq)] |
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pub struct Car { |
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pub color: String, |
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pub plate: String, |
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} |
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#[derive(Debug)] |
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pub struct RentalBusiness { |
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pub car: RefCell<Car>, |
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} |
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impl RentalBusiness { |
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pub fn rent_car(&self) -> Ref<Car> {} |
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pub fn sell_car(&self) -> Car {} |
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pub fn repair_car(&self) -> RefMut<Car> {} |
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pub fn change_car(&self, new_car: Car) {} |
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} |
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``` |
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### Usage |
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Here is a program to test your function: |
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```rust |
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use car_rental::*; |
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use std::cell::RefCell; |
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fn main() { |
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let car_rental = RentalBusiness { |
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car: RefCell::new(Car { |
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color: "red".to_string(), |
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plate: "AAA".to_string(), |
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}), |
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}; |
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println!("{:?}", car_rental.rent_car()); |
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println!("{:?}", car_rental.repair_car()); |
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{ |
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let mut car = car_rental.repair_car(); |
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car.color = "blue".to_string(); |
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} |
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println!("{:?}", car_rental.rent_car()); |
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car_rental.change_car(Car { |
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color: "pink".to_string(), |
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plate: "WWW".to_string(), |
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}); |
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println!("{:?}", car_rental.rent_car()); |
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println!("{:?}", car_rental.sell_car()); |
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println!("{:?}", car_rental.sell_car()); |
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} |
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``` |
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And its output: |
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```console |
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$ cargo run |
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Car { color: "red", plate: "AAA" } |
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Car { color: "red", plate: "AAA" } |
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Car { color: "blue", plate: "AAA" } |
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Car { color: "pink", plate: "WWW" } |
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Car { color: "pink", plate: "WWW" } |
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Car { color: "", plate: "" } |
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$ |
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``` |
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### Notions |
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- [std::cell::RefCell](https://doc.rust-lang.org/std/cell/struct.RefCell.html) |
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- [Struct std::rc::Rc](https://doc.rust-lang.org/std/rc/struct.Rc.html) |
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