1use std::{borrow::Borrow, cmp::Ordering};
2
3#[derive(Debug, Clone)]
4pub struct Item<K, V> {
5 pub key: K,
6 pub value: V,
7}
8
9impl<K, V> Item<K, V> {
10 pub fn new(key: K, value: V) -> Self {
11 Self { key, value }
12 }
13
14 pub fn key_cmp<Q>(&self, key: &Q) -> Ordering
15 where
16 K: Borrow<Q> + Ord,
17 Q: Ord + ?Sized,
18 {
19 self.key.borrow().cmp(key)
20 }
21
22 pub fn as_pair(&self) -> (&K, &V) {
23 (&self.key, &self.value)
24 }
25
26 pub fn into_pair(self) -> (K, V) {
27 (self.key, self.value)
28 }
29}
30
31impl<K, V> AsRef<Item<K, V>> for Item<K, V> {
32 fn as_ref(&self) -> &Self {
33 self
34 }
35}
36
37impl<K: PartialEq, V> PartialEq for Item<K, V> {
38 fn eq(&self, other: &Self) -> bool {
39 self.key == other.key
40 }
41}
42
43impl<K: Eq, V> Eq for Item<K, V> {}
44
45impl<K: PartialOrd, V> PartialOrd for Item<K, V> {
46 fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
47 self.key.partial_cmp(&other.key)
48 }
49}
50
51impl<K: Ord, V> Ord for Item<K, V> {
52 fn cmp(&self, other: &Self) -> std::cmp::Ordering {
53 self.key.cmp(&other.key)
54 }
55}
56
57impl<K: std::fmt::Display, V: std::fmt::Display> std::fmt::Display for Item<K, V> {
58 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
59 write!(f, "({}, {})", self.key, self.value)
60 }
61}