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July 7, 2024 22:09
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builder pattern in rust
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use crate::Topping::{Ham, Pepper, Pineapple}; | |
#[derive(Debug)] | |
enum Topping { | |
Peperoni, | |
Ham, | |
Pineapple, | |
Oregano, | |
Pepper, | |
} | |
#[derive(Debug)] | |
enum Size { | |
Small, | |
Medium, | |
Large, | |
} | |
#[derive(Debug)] | |
struct Pizza { | |
name: String, | |
size: Size, | |
topping_1: Option<Topping>, | |
topping_2: Option<Topping>, | |
topping_3: Option<Topping>, | |
} | |
struct PizzaBuilder { | |
name: String, | |
size: Size, | |
topping_1: Option<Topping>, | |
topping_2: Option<Topping>, | |
topping_3: Option<Topping>, | |
} | |
impl PizzaBuilder { | |
fn new(name: &str) -> PizzaBuilder { | |
PizzaBuilder { | |
name: name.to_string(), | |
size: Size::Medium, | |
topping_1: None, | |
topping_2: None, | |
topping_3: None, | |
} | |
} | |
fn size(mut self, size: Size) -> PizzaBuilder { | |
self.size = size; | |
self | |
} | |
fn topping_1(mut self, topping: Topping) -> PizzaBuilder { | |
self.topping_1 = Some(topping); | |
self | |
} | |
fn topping_2(mut self, topping: Topping) -> PizzaBuilder { | |
self.topping_2 = Some(topping); | |
self | |
} | |
fn topping_3(mut self, topping: Topping) -> PizzaBuilder { | |
self.topping_3 = Some(topping); | |
self | |
} | |
fn build(self) -> Pizza { | |
Pizza { | |
name: self.name, | |
size: self.size, | |
topping_1: self.topping_1, | |
topping_2: self.topping_2, | |
topping_3: self.topping_3, | |
} | |
} | |
} | |
fn main() { | |
let pizza1 = PizzaBuilder::new("Nice") | |
.topping_2(Topping::Ham) | |
.topping_1(Topping::Peperoni) | |
.build(); | |
println!("Pizza 1: {:#?}", pizza1); | |
let pizza2 = PizzaBuilder::new("Better") | |
.topping_2(Topping::Ham) | |
.topping_1(Topping::Peperoni) | |
.size(Size::Large) | |
.build(); | |
println!("Pizza 2: {:#?}", pizza2); | |
let pizza3 = PizzaBuilder::new("Best") | |
.topping_2(Topping::Ham) | |
.topping_1(Topping::Peperoni) | |
.topping_3(Pineapple) | |
.topping_3(Pepper) | |
.size(Size::Large) | |
.build(); | |
println!("Pizza 3: {:#?}", pizza3); | |
} |
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