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use std::collections::VecDeque;
use crate::algorithms::{Queue, QueueType};
use crate::StateId;
#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub struct FifoQueue(VecDeque<StateId>);
impl Queue for FifoQueue {
fn head(&mut self) -> Option<StateId> {
self.0.front().cloned()
}
fn enqueue(&mut self, state: StateId) {
self.0.push_back(state)
}
fn dequeue(&mut self) {
self.0.pop_front();
}
fn update(&mut self, _state: StateId) {}
fn is_empty(&self) -> bool {
self.0.is_empty()
}
fn clear(&mut self) {
self.0.clear()
}
fn queue_type(&self) -> QueueType {
QueueType::FifoQueue
}
}
#[cfg(test)]
mod test {
use super::*;
use anyhow::Result;
#[test]
fn test_fifo_queue() -> Result<()> {
let mut queue = FifoQueue::default();
assert_eq!(queue.head(), None);
queue.enqueue(2);
queue.enqueue(3);
assert_eq!(queue.head(), Some(2));
queue.dequeue();
assert_eq!(queue.head(), Some(3));
queue.dequeue();
queue.enqueue(2);
queue.enqueue(3);
assert_eq!(queue.is_empty(), false);
assert_eq!(queue.head(), Some(2));
queue.clear();
assert_eq!(queue.head(), None);
assert_eq!(queue.is_empty(), true);
Ok(())
}
}