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blog(aoc-2022): fix footnotes in 3rd week

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Signed-off-by: Matej Focko <me@mfocko.xyz>
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Matej Focko 2023-07-07 00:23:33 +02:00
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blog/aoc-2022/03-week-3.md
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@ -443,7 +443,7 @@ though :) Let's go through the details.
#### `Default` trait
For the first time and twice I had a need to have a default value for my types,
enumerations in this case. Rust offers a very nice trait[^4] that is described
enumerations in this case. Rust offers a very nice trait[^1] that is described
as:
> A trait for giving a type a useful default value.
@ -451,7 +451,7 @@ as:
I guess it sums it up nicely. The more interesting part about this is the fact
that you can use the _macro machinery_ to save yourself some typing. If you have
enumeration of which the default value doesn't bear any parameter, you can just
do[^5]:
do[^2]:
```rust
#[derive(Default)]
@ -466,18 +466,13 @@ enum Color {
#### Abusing negation
If you want to use a _unary minus_ operator on your own type, you can implement
a `Neg` trait[^6]. I was dealing with a binary tree and needed a way how to look
a `Neg` trait[^3]. I was dealing with a binary tree and needed a way how to look
at the other side, so I have just implemented the negation for flipping between
left and right :smile:
[^1]: Copy-pasting might be a relaxing thing to do, but you can also discover
nasty stuff about your PC. See [this Reddit post and the comment].
[^2]: [GitHub profile](https://github.com/martinjonas)
[^3]: Even though you can use it even for libraries, but handling errors from
libraries using `anyhow` is nasty… You will be the stinky one ;)
[^4]: [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) docs
[^5]: Pardon my example from the graph algorithms ;)
[^6]: [`Neg`](https://doc.rust-lang.org/std/ops/trait.Neg.html) docs
[^1]: [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) docs
[^2]: Pardon my example from the graph algorithms ;)
[^3]: [`Neg`](https://doc.rust-lang.org/std/ops/trait.Neg.html) docs
[_Advent of Code_]: https://adventofcode.com
[`itertools`]: https://crates.io/crates/itertools