Sample code to implement Chain of responsibility in Rust

chain-of-responsibility.rs

trait IProcessor<'a> {
    fn set_next(&'a mut self, next: &'a mut dyn IProcessor<'a>);
}

struct Processor<'a> {
    next: Option<&'a mut dyn IProcessor<'a>>,
}

impl<'a> IProcessor<'a> for Processor<'a> {
    fn set_next(&'a mut self, next: &'a mut dyn IProcessor<'a>) {
        self.next = Some(next);
    }
}

struct Container<'a> {
    p1: Processor<'a>,
    p2: Processor<'a>,
}

impl<'a> Container<'a> {
    fn new() -> Self {
        let p1 = Processor { next: None };
        let p2 = Processor { next: None };

        // TODO: set p2 as next for p1

        Self { p1, p2 }
    }
}

fn main() {
    let mut c = Container::new();
}