This is the 13th in a series of videos that cover, step by step, learning to code using the Rust programming language.

In this video we'll cover Reference Counting and Interior Mutability.

0:00 - Introduction
0:23 - Directed Acyclic Graph
1:37 - Reference-counted heap pointer
2:40 - Building a graph
3:58 - Updating display function to walk the graph
4:24 - Fixing errors, finalizing the graph structure
6:30 - Using Drop to track when nodes are released
8:28 - Reference counted objects are immutable
8:48 - Weak pointers
10:39 - Avoiding cyclical references using weak pointers
11:17 - Avoiding lifetime extension using weak pointers
11:38 - Downgrade/upgrade transition between Rc/Weak
11:47 - Introducing RefCell: Interior Mutability
15:14 - How does RefCell work?
17:18 - Use RefCell as a last resort
17:52 - In Summary

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