#small success

In other news, i learned how to do those automatic docs for Rust using doc comments :) they look so fancyyyy just like std docs.

Lastly, there is a very funny trick using zero-sized types in Rust. A Map is a data structure which maps every key to one value uniquely, and then a Set is a data structure which keeps track of unique values efficiently. Since both keep track of uniqueness of keys, they may often be implemented using similar algorithms underneath.

With zero-sized types (ZSTs) in Rust, it is even possible to very easily implement a Set using a Map. Given a Map defined as Map<K: Ord, V> with keys of type K and values of type V, it is possible to fully define a Set by basically making a Set into a Map for which V is a ZST.

In fact, this is how it is done in std library. For instance, BTreeSet contains a BTreeMap with value type V set to an empty struct (zero-sized type):

All it does is relay methods to the underlying map + apply some glue inbetween. For instance, insert() and remove() on a Map return Option<> and Set's insert() and remove() should return a boolean. This can be easily converted using is_none() and is_some():

First, relax, don't rush, and focus.

And that's what I did! First, I lay on my stomach because I like that position. Then I kept telling myself, "Okay, it's fine if I don't succeed today. It's not the end of the world." Then I thought about directing my intention towards a state of emptiness or reality shifting... but I chose reality shifting because I was excited to go to the doctor. So I closed my eyes and started telling myself I was in my own world. After ten minutes, I started to float, and then I was floating above my own doctor, even though it wasn't the way I'd designed it. Also, even though I was floating, I could still feel my body on my bed, and I knew my eyes were closed, but I could still feel the wind hitting my forehead. After a few more seconds, I came out and failed. So... but I think it's a small success too.