Clone

Sometimes you want to make a copy of a value. The Clone trait accomplishes this.

1. ```
   fn say_hello(name: String) {
   ```
2. ```
       println!("Hello {name}")
   ```
3. ```
   }
   ```

5. ```
   fn main() {
   ```
6. ```
       let name = String::from("Alice");
   ```
7. ```
       say_hello(name.clone());
   ```
8. ```
       say_hello(name);
   ```
9. ```
   }
   ```

This slide should take about 2 minutes.

• The idea of Clone is to make it easy to spot where heap allocations are occurring. Look for .clone() and a few others like vec! or Box::new.
• It’s common to “clone your way out” of problems with the borrow checker, and return later to try to optimize those clones away.
• clone generally performs a deep copy of the value, meaning that if you e.g. clone an array, all of the elements of the array are cloned as well.
• The behavior for clone is user-defined, so it can perform custom cloning logic if needed.