armanriazi•rust•reference•dangle

ArmanRiazi answered on March 19, 2022 Popularity 2/10 Helpfulness 1/10

armanriazi•rust•reference•dangle

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{
The main aim of lifetimes is to prevent dangling references.
which has an outer scope and an inner scope.
}

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.
*/

Popularity 2/10 Helpfulness 1/10 Language rust

Source: github.com

Tags: rust

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Contributed on Mar 19 2022

ArmanRiazi

0 Answers Avg Quality 2/10

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