Code shared from the Rust Playground

playground.rs

use std::error::Error;
use std::slice::Iter;

struct Query {
    query: String,
}

struct Response {
    response: u64,
}

trait Responsability {
    fn take(&self, iterator: Iter<Box<dyn Responsability>>, query: Query) -> Result<Response, Box<dyn Error>>;
}

struct ResponsabilityChain {
    responsabilities: Vec<Box<dyn Responsability>>,
}

impl ResponsabilityChain {
    pub fn new(responsabilities: Vec<Box<dyn Responsability>>) -> Self {
        Self { responsabilities }
    }
    
    pub fn launch(&self, query: Query) -> Result<Response, Box<dyn Error>> {
        let mut iterator: Iter<Box<dyn Responsability>> = self.responsabilities.iter();
        let responsability = iterator.next().unwrap();
        
        responsability.take(iterator, query)
    }
}

fn main() {
    println!("Helo, world!");
}