src/lib.rs


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#![feature(associated_type_defaults)]

pub trait Solution: Problem {
    type Answer1: std::fmt::Display + Default = String;

    type Answer2: std::fmt::Display + Default = String;

    fn part_1(input: &str) -> Result<Self::Answer1, anyhow::Error>;

    fn part_2(input: &str) -> Result<Self::Answer2, anyhow::Error>;

    fn solve() -> anyhow::Result<()> {
        println!("Day {}", Self::DAY);
        println!("\tpart 1: {}", Self::part_1(Self::INPUT)?);
        println!("\tpart 2: {}\n", Self::part_2(Self::INPUT)?);

        Ok(())
    }
}

pub trait Problem {
    const DAY: u8;

    const INPUT: &'static str;
}