#[derive(Copy, Clone, Default, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Generation(u32);
impl Generation {
    pub fn new() -> Self {
        Self::default()
    }
    pub fn inc(&mut self) {
        self.0 += 1
    }
}
impl std::fmt::Display for Generation {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}