Box

Box is an owned pointer to data on the heap:

fn main() {
    let five = Box::new(5);
    println!("five: {}", *five);
}
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5StackHeapfive

Box<T> implements Deref<Target = T>, which means that you can call methods from T directly on a Box<T>.

Speaker Notes
  • Box is like std::unique_ptr in C++.
  • In the above example, you can even leave out the * in the println! statement thanks to Deref.