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The Ultimate Guide to Rust Programming

Parameterized Functions

Explore how to create parameterized functions in Rust that accept generic type parameters. Understand the benefits of using type parameters to avoid code duplication and handle values like age flexibly, improving function usability and code maintenance.

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I want to say hi to Alice and Bob. But for now, at least, I’m going to be polite and not mention how old they are. How exactly do we write that function? Let’s first write a version that works for Alice. This code won’t compile; try to see if you can figure out why.

Rust 1.40.0
struct Person<Name, Age> {
    name: Name,
    age: Age,
}
fn greet(person: &Person<String, u32>) {
    println!("Hello, {}", person.name);
}
fn main() {
    let alice: Person<String, u32> = Person {
        name: "Alice".to_owned(),
        age: 30_u32,
    };
    greet(&alice);
    let bob: Person<String, u64> = Person {
        name: "Bob".to_owned(),
        age: 35_u64,
    };
    greet(&bob);
}

The compiler gives us the following error message:

 ...