Breaking News: Grepper is joining You.com. Read the official announcement!

armanriazi•rust•reference•dangle

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

armanriazi•rust•reference•dangle

Comment

{
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

Link to this answer
Share Copy Link

Contributed on Mar 19 2022

ArmanRiazi

0 Answers Avg Quality 2/10

Continue with Google

By continuing, I agree that I have read and agree to Greppers's Terms of Service and Privacy Policy.

armanriazi•rust•reference•dangle

Contents

More Related Answers

armanriazi•rust•reference•dangle

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.