vec_porcupine_fever.rs

#[derive(Debug, Copy, Clone)]
struct Cage {
    pub sick:i32,
    pub healthy:i32,
    pub alive:i32
}

impl Cage {
    pub fn derive(self)->Cage {
//...
    }
}

fn main() {
//...
    let mut cages:Vec<Cage> = vec![];
//...

  for year in 0..y {
        // The iter pattern is explained at https://stackoverflow.com/a/30026986/15619
        // In quite an un-intuitive way, to have map working, the struct must derive Copy and Clone
        // To have references copiable (see https://stackoverflow.com/a/28527789/15619)
        let mut next_cages:Vec<Cage> = cages.iter().map(|c| c.derive()).collect();
//...
    }