rust•armanazi•reference•dangle
fn main() {
// let reference_to_nothing = dangle();
let reference_to_nothing = no_dangle();
}
fn dangle() -> &String { // dangle returns a reference to a String
let s = String::from("hello"); // s is a new String
&s // we return a reference to the String, s
} // Here, s goes out of scope, and is dropped. Its memory goes away.
// Danger!
//primitive types need to &'a or &'static
fn no_dangle() -> String {
let s = String::from("hello");
s
}
/*
no_dangle: This works without any problems. Ownership is moved out, and nothing is deallocated.
*/