Created
September 10, 2024 00:23
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Rust trait plaything
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| use core::panic; | |
| trait Animal { | |
| fn name(&self) -> &'static str; | |
| fn talk(&self) { | |
| println!("{} cannot talk", self.name()); | |
| } | |
| } | |
| struct Dog; | |
| impl Dog { | |
| fn new() -> Dog { | |
| Dog | |
| } | |
| } | |
| impl Animal for Dog { | |
| fn name(&self) -> &'static str { | |
| "Dog" | |
| } | |
| fn talk(&self) { | |
| println!("{} says: Woof!", self.name()); | |
| } | |
| } | |
| struct Cat; | |
| impl Cat { | |
| fn new() -> Cat { | |
| Cat | |
| } | |
| } | |
| impl Animal for Cat { | |
| fn name(&self) -> &'static str { | |
| "Cat" | |
| } | |
| fn talk(&self) { | |
| println!("{} says: Meow!", self.name()); | |
| } | |
| } | |
| fn parse_animal(animals: &String) -> Vec<Box<dyn Animal>> { | |
| let mut result = Vec::new(); | |
| for animal in animals.split(",") { | |
| match animal { | |
| "dog" => result.push(Box::new(Dog::new()) as Box<dyn Animal>), | |
| "cat" => result.push(Box::new(Cat::new()) as Box<dyn Animal>), | |
| _ => panic!("unknown animal: {}", animal), | |
| } | |
| } | |
| result | |
| } | |
| fn main() { | |
| let animals = "dog,cat,dog,dog,cat".to_string(); | |
| parse_animal(&animals).iter().for_each(|animal| { | |
| animal.talk(); | |
| }); | |
| } |
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