rust•armanazi•borrowchecker•lifetime•static

let s: &'static str = "I have a static lifetime."; The text of this string is stored directly in the program’s binary, which is always available. Therefore, the lifetime of all string literals is 'static. You might see suggestions to use the 'static lifetime in error messages. But before specifying 'static as the lifetime for a reference, think about whether the reference you have actually lives the entire lifetime of your program or not. You might consider whether you want it to live that long, even if it could. Most of the time, the problem results from attempting to create a dangling reference or a mismatch of the available lifetimes. In such cases, the solution is fixing those problems, not specifying the 'static lifetime.

rust•armanazi•borrowchecker•lifetime•struct

Lifetime names for struct fields always need to be declared after the impl keyword and then used after the struct’s name, because those lifetimes are part of the struct’s type.
In method signatures inside the impl block, references might be tied to the lifetime of references in the struct’s fields, or they might be independent. In addition, the lifetime elision rules often make it so that lifetime annotations aren’t necessary in method signatures
    e.g:
    impl<'a> ImportantExcerpt<'a> {
    fn announce_and_return_part(&self, announcement: &str) -> &str {
        println!("Attention please: {}", announcement);
        self.part
    }
    }
   /*There are two input lifetimes, so Rust applies the first lifetime elision rule and gives both &self and announcement their own lifetimes. Then, because one of the parameters is &self, the return type gets the lifetime of &self, and all lifetimes have been accounted for.*
struct ImportantExcerpt<'a> {
    part: &'a str,
}
*/
    //no_err_func
fn first_word(s: &str) -> &str {

fn first_word<'a>(s: &'a str) -> &str {

fn first_word<'a>(s: &'a str) -> &'a str {

fn longest(x: &str, y: &str) -> &str {
   //err_func
fn longest<'a, 'b>(x: &'a str, y: &'b str) -> &str {
  //no_err_method
fn longest<'a, 'b>(x: &'a str, y: &'b str) -> &str {

Posted by: Guest on March-22-2022

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