Crust of Rust: Smart Pointers and Interior Mutability

Crust of Rust: Smart Pointers and Interior Mutability

In this fourth Crust of Rust video, we cover smart pointers and interior mutability, by re-implementing the Cell, RefCell, and Rc types from the standard library. As part of that, we cover when those types are useful, how they work, and what the equivalent thread-safe versions of these types are. In the process, we go over some of the finer details of Rust's ownership model, and the UnsafeCell type. Crust of Rust: Smart Pointers and Interior Mutability

We also dive briefly into the Drop Check rabbit hole ( ) before coming back up for air.

This is definitely a more technically advanced stream than some of the earlier ones, and may be a little harder to follow. I apologize for that in advance! Please do leave questions here or on Discord and I'll try to help explain what's going on.

You can find the final code at

0:00:00 Introduction 0:01:11 Discord 0:02:31 Agenda 0:03:50 Interior Mutability 0:07:47 Cell 0:23:39 Trying to Test Cell 0:40:17 UnsafeCell 0:41:21 RefCell 0:54:21 RefCell Smart Pointer 1:06:27 Rc (reference counted ptr) 1:23:49 NonNull 1:31:55 PhantomData and Drop Check 1:44:25 ?Sized Briefly 1:47:30 Thread Safety 1:54:20 Copy-on-Write (Cow)

☞ Crust of Rust: Lifetime Annotations ☞ Crust of Rust: Declarative Macros ☞ Crust of Rust: Iterators ☞ Crust of Rust: Smart Pointers and Interior Mutability ☞ Crust of Rust: Channels

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