zero_cost_data_abstraction.rs

const ANIMAL: u8 = 1 << 0;
const TOY:    u8 = 1 << 1;
const PET:    u8 = 1 << 2;

struct Dog<'d>{
    abstraction: u8,
    name: &'d str
}

fn main() {
    let petdog = Dog{
        abstraction: ANIMAL | PET,
        name: "bust"
    };
    let toydog = Dog{
        abstraction: ANIMAL | TOY,
        name: "Forrest"
    };
    if petdog.abstraction & (ANIMAL) == ANIMAL{
        println!("Pet dog is an animal")
    }
    if petdog.abstraction & (PET) == PET{
        println!("Pet dog is an pet")
    }
    if toydog.abstraction & (ANIMAL) == ANIMAL{
        println!("Toy dog is an animal")
    }
    if toydog.abstraction & (TOY)== TOY{
        println!("Toy dog is an toy")
    }
}