├── Cargo.toml
├── Cargo.lock
└── src
    └── main.rs


/Cargo.toml:
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1 | [package]
2 | name = "sandbox-rust-lifetimes"
3 | version = "0.1.0"
4 | edition = "2021"
5 | 
6 | [dependencies]
7 | 


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/Cargo.lock:
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1 | # This file is automatically @generated by Cargo.
2 | # It is not intended for manual editing.
3 | version = 3
4 | 
5 | [[package]]
6 | name = "sandbox-rust-lifetimes"
7 | version = "0.1.0"
8 | 


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/src/main.rs:
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 1 | fn main() {
 2 |     println!("Hello, world!");
 3 | }
 4 | 
 5 | //===============================
 6 | // TYPES
 7 | //===============================
 8 | 
 9 | // a struct with a lifetime annotation
10 | struct Car<'a> {
11 |     model: &'a str
12 | }
13 | 
14 | //===============================
15 | // FUNCS
16 | //===============================
17 | 
18 | // in this example, the compiler will error is you uncomment the print
19 | fn dangling_reference() {
20 |     let r;
21 |     {
22 |         let x = 5;
23 |         r = &x;
24 |     }
25 |     // println!("{}", r); 💥 Dangling reference!
26 | }
27 | 
28 | // in this example, we have a function which returns a reference with annotated lifetimes
29 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
30 |     if x.len() > y.len() {
31 |         x
32 |     } else {
33 |         y
34 |     }
35 | }
36 | 
37 | // in this example, we use a lifetime within a trait bound
38 | fn print_with_lifetime<'a, T>(item: &'a T)
39 | where
40 |     T: std::fmt::Display + 'a,
41 | {
42 |     println!("{}", item);
43 | }
44 | 
45 | 
46 | 


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