How to accept &str, String and &String in a single function?

Question

I want to write a single function, that accepts a &str, a String and a borrowed &String. I\'ve written the following 2 functions:<

Answer 1

You can use the AsRef<str> trait:

// will accept any object that implements AsRef<str>
fn print<S: AsRef<str>>(stringlike: S) {
    // call as_ref() to get a &str
    let str_ref = stringlike.as_ref();

    println!("got: {:?}", str_ref)
}

fn main() {
    let a: &str = "str";
    let b: String = String::from("String");
    let c: &String = &b;

    print(a);
    print(c);
    print(b);
}

The print function will support any type that implements AsRef<str>, which includes &str, String and &String.