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Basic example for understanding Rust traits
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| #![allow(clippy::upper_case_acronyms)] | |
| // a trait for describing vehicles that can move on land | |
| trait LandCapable { | |
| // a function with no implementation acts as an interface | |
| //fn drive(&self); | |
| // default imlpementation | |
| fn drive(&self) { | |
| println!("Default drive"); | |
| } | |
| } | |
| // takes an implementation of LandCapable and calls the drive function | |
| fn road_trip(vehicle: &impl LandCapable) { | |
| vehicle.drive(); | |
| } | |
| // one type of LandCapable struct that does not implement drive() | |
| struct Sedan; | |
| impl LandCapable for Sedan {} | |
| // another type of LandCapable struct that does implement drive() | |
| struct SUV; | |
| impl LandCapable for SUV { | |
| fn drive(&self) { | |
| println!("SUV is driving"); | |
| } | |
| } | |
| // a trait for describing vehicles that can move on water | |
| trait WaterCapable { | |
| fn float(&self) { | |
| println!("Default float"); | |
| } | |
| } | |
| // a super trait made from combining two other traits | |
| trait Amphibious: WaterCapable + LandCapable {} | |
| // a struct that implements the super trait | |
| struct Hovercraft; | |
| impl Amphibious for Hovercraft {} | |
| impl LandCapable for Hovercraft {} | |
| impl WaterCapable for Hovercraft { | |
| fn float(&self) { | |
| println!("Hovercraft is floating"); | |
| } | |
| } | |
| // a funciton that takes the super trait as a parameter | |
| fn traverse_frozen_lake(vehicle: &impl Amphibious) { | |
| vehicle.drive(); | |
| vehicle.float(); | |
| } | |
| // Has the following output: | |
| // Default drive | |
| // SUV is driving | |
| // Default drive | |
| // Hovercraft is floating | |
| fn main() { | |
| let car = Sedan; | |
| road_trip(&car); | |
| let suv = SUV; | |
| road_trip(&suv); | |
| let hc = Hovercraft; | |
| traverse_frozen_lake(&hc); | |
| } |
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