جعل بنية متوافقة مع Trait

A trait only describes behavior. To use it, a struct must conform by actually implementing the required methods. ✍️

You declare conformance by listing the trait in parentheses after the struct name, just like a parameter list.

Conforming means you must implement each method the trait requires, with a matching name and signature.

Your method has to match the trait's signature: same arguments and return type. A mismatch breaks conformance.

When you claim a trait, Mojo checks at compile time that every required method is present and correct.

Forget a required method and the build fails with a clear error. The contract is enforced, not just suggested.

A struct can satisfy several traits at once by listing them all, gaining each capability it implements.

The trait says which methods exist, but your struct decides how they work. A Cat and Dog can greet differently.

A struct may add its own methods beyond the trait. Conformance only requires the contract be met, not limited.

Once a struct conforms, it can be passed anywhere that trait is expected. That is the real payoff coming next.

Here a Dog conforms to Greetable and supplies its own greeting, fully satisfying the trait.

How does a struct promise to follow a trait?

To conform, list the trait after the struct name and implement its methods with matching signatures. The compiler checks it. ✅