TicketManagement/ImplTrait/Task/src/lib.rs

// TODO: Implement the `in_progress` method. It must return an iterator over the tickets in
//  `TicketStore` with status set to `Status::InProgress`.
use ticket_fields::{TicketDescription, TicketTitle};

#[derive(Clone)]
pub struct TicketStore {
    tickets: Vec<Ticket>,
}

#[derive(Clone, Debug, PartialEq)]
pub struct Ticket {
    pub title: TicketTitle,
    pub description: TicketDescription,
    pub status: Status,
}

#[derive(Clone, Debug, Copy, PartialEq)]
pub enum Status {
    ToDo,
    InProgress,
    Done,
}

impl TicketStore {
    pub fn new() -> Self {
        Self {
            tickets: Vec::new(),
        }
    }

    pub fn add_ticket(&mut self, ticket: Ticket) {
        self.tickets.push(ticket);
    }

    pub fn in_progress(&self) -> impl Iterator<Item = &Ticket> {
        self.tickets
            .iter()
            .filter(|ticket| ticket.status == Status::InProgress)
    }
}