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2024/rust_mem_model/Cargo.toml

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+[package]
+name = "rust_mem_model"
+version = "0.1.0"
+edition = "2021"
+
+

2024/rust_mem_model/src/step_1.rs

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+
+// fn main() {
+//     let s1 = String::from("hello");
+//     let s2 = s1;
+//     println!("{}, world!", s1);
+// }
+
+// fn main() {
+//     let s1 = String::from("hello");
+//     let s2 = &s1;
+//     println!("{}, world!", s2);
+// }
+
+// fn main() {
+//     let mut s1 = String::from("hello");
+//     let s2 = &mut s1;
+//     s2.push_str(", world!");
+//     println!("{}", s1);
+// }
+
+// fn main() {
+//     let mut s1 = String::from("hello");
+//     let s2 = &mut s1;
+//     let s3 = &mut s1;
+//     s2.push_str(", world!");
+//     println!("{}", s1);
+// }
+//
+
+// fn main() {
+//     let s1 = String::from("hello");
+//     let s2 = s1.clone();
+//     println!("{}, world!", s1);
+// }
+
+// fn main() {
+//     let s1 = String::from("hello, world!");
+//     let s2 = &s1[0..5];
+//     println!("{}", s2);
+// }

2024/rust_mem_model/src/step_2.rs

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+
+// fn main() {
+//     // stack allocation
+//     let x = 5;
+//     let y = x;
+//
+//     println!("x = {}, y = {}", x, y);
+// }
+
+// fn main() {
+//     // heap allocation
+//     let s1 = String::from("hello");
+//     let s2 = s1;
+//
+//     println!("{}, world!", s1);
+// }
+

2024/rust_mem_model/src/step_3.rs

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+mod main;
+
+fn same_lifetime<'a>(s: &'a str, start: usize, end: usize) -> &'a str {
+    &s[start..end]
+}
+
+fn equal_lifetimes<'a, 'b: 'a>(x: &'a str, y: &'b str) -> &'a str {
+    if x.len() > y.len() {
+        x
+    } else {
+        y
+    }
+}
+
+fn main() {
+    let s1 = String::from("hello, world!");
+    let s2 = same_lifetime(s1.as_str(), 0, 5);
+    let result = equal_lifetimes(s1.as_str(), s2);
+    println!("The longest string is {}", result);
+}