Traits and struct embedding in Chi

07_traits_embed.cx

trait Animal {
        int get_id();
        void talk() {}
}

struct AnimalBase {
    Animal animal...;
    int id;

    void new(int id) {
        this.id = id;
    }

    int get_id() {
        return this.id;
    }
};

struct Sheep {
    AnimalBase animal...;

    void new(int id) {
        this.animal = {id};
    }

    void talk() {
        printf("baaaaahh {}\n", this.get_id());
    }
};

struct Dog {
    AnimalBase animal...;

    void new(int id) {
        this.animal = {id};
    }

    int get_id() {
        return -this.animal.id;
    }

    void talk() {
        printf("wuff wuff {}\n", this.get_id());
    }
};

struct Cat {
    Animal animal...;

    int get_id() {
        return 0;
    }

    void talk() {
        printf("meeoooww {}\n", this.get_id());
    }
};

int main() {
    Cat cat = {};
    Animal animal = &cat;
    animal.talk();

    Sheep sheep = {1};
    Sheep sheep2 = {2};
    animal = &sheep;
    animal.talk();
    animal = &sheep2;
    animal.talk();

    Dog dog = {3};
    animal = &dog;
    animal.talk();
    return 0;
}

07_traits_embed.expect

meeoooww 0
baaaaahh 1
baaaaahh 2
wuff wuff -3