Stage 8.14: Box

Box is a data structure that allows us to move our data from the stack to the heap.

Box is a struct known as a smart pointer that holds the pointer to our data on the heap.

Because Box is a struct with a known size (because it just holds a pointer), it is often used as a way to store a reference to something in a struct that must know the size of its fields.

Box is so common it can be used from anywhere:

Box::new(Foo { ... })

Further information:

• https://doc.rust-lang.org/std/boxed/struct.Box.html
• https://doc.rust-lang.org/rust-by-example/std/box.html