maplike 0.15.0

Rust traits for abstract containers and operations over them. Treats every container as map. You can have the same code work on Vec, HashMap, BTreeMap, Option, Box.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

// SPDX-FileCopyrightText: 2025 maplike contributors
//
// SPDX-License-Identifier: MIT OR Apache-2.0

use core::borrow::Borrow;

use std_::{collections::HashSet, hash::Hash};

use crate::abc::{Container, Keyed};
use crate::iter::{IntoIter, IntoValues, Iter, Values, ValuesFromKeyValuePairs};
use crate::ops::{Clear, Get, Insert, Len, Put, Remove, Set, WithOne};

impl<K> Container for HashSet<K> {
    type Value = ();
}

impl<K> Keyed for HashSet<K> {
    type Key = K;
}

impl<K: Eq + Hash> WithOne<K> for HashSet<K> {
    #[inline(always)]
    fn with_one(element: K) -> Self {
        let mut hashset = HashSet::new();
        HashSet::insert(&mut hashset, element);

        hashset
    }
}

impl<K: Eq + Hash, Q: Eq + Hash + ?Sized> Get<Q> for HashSet<K>
where
    K: Borrow<Q>,
{
    #[inline(always)]
    fn get(&self, key: &Q) -> Option<&()> {
        HashSet::get(self, key).map(|_| &())
    }
}

impl<K: Eq + Hash> Set<K> for HashSet<K> {
    type Output = bool;

    #[inline(always)]
    fn set(&mut self, key: K, _value: ()) -> bool {
        HashSet::insert(self, key)
    }
}

impl<K: Eq + Hash> Insert<K> for HashSet<K> {
    type Output = bool;

    #[inline(always)]
    fn insert(&mut self, key: K, _value: ()) -> bool {
        HashSet::insert(self, key)
    }
}

impl<K: Eq + Hash, Q: Eq + Hash + ?Sized> Remove<Q> for HashSet<K>
where
    K: Borrow<Q>,
{
    type Output = Option<()>;

    #[inline(always)]
    fn remove(&mut self, key: &Q) -> Option<()> {
        HashSet::remove(self, key).then_some(())
    }
}

impl<V: Eq + Hash> Put<V> for HashSet<V> {
    #[inline(always)]
    fn put(&mut self, value: V) -> Option<V> {
        HashSet::insert(self, value);

        None
    }
}

impl<K: Eq + Hash> Clear for HashSet<K> {
    #[inline(always)]
    fn clear(&mut self) {
        HashSet::clear(self);
    }
}

impl<K> Len for HashSet<K> {
    #[inline(always)]
    fn len(&self) -> usize {
        HashSet::len(self)
    }
}

impl<'a, K: 'a> Values<'a> for HashSet<K> {
    type Values = ValuesFromKeyValuePairs<MapIter<'a, K>>;

    #[inline(always)]
    fn values(&'a self) -> Self::Values {
        ValuesFromKeyValuePairs(Iter::iter(self))
    }
}

impl<K> IntoValues for HashSet<K> {
    type IntoValues = ValuesFromKeyValuePairs<MapIntoIter<K>>;

    #[inline(always)]
    fn into_values(self) -> Self::IntoValues {
        ValuesFromKeyValuePairs(IntoIter::into_iter(self))
    }
}

pub struct MapIter<'a, K>(std_::collections::hash_set::Iter<'a, K>);

impl<'a, K> Iterator for MapIter<'a, K> {
    type Item = (&'a K, &'a ());

    #[inline(always)]
    fn next(&mut self) -> Option<Self::Item> {
        self.0.next().map(|key| (key, &()))
    }
}

impl<'a, K: 'a> Iter<'a, &'a K> for HashSet<K> {
    type Iter = MapIter<'a, K>;

    #[inline(always)]
    fn iter(&'a self) -> MapIter<'a, K> {
        MapIter(HashSet::iter(self))
    }
}

pub struct MapIntoIter<K>(std_::collections::hash_set::IntoIter<K>);

impl<K> Iterator for MapIntoIter<K> {
    type Item = (K, ());

    #[inline(always)]
    fn next(&mut self) -> Option<Self::Item> {
        self.0.next().map(|k| (k, ()))
    }
}

impl<K> IntoIter<K> for HashSet<K> {
    type IntoIter = MapIntoIter<K>;

    #[inline(always)]
    fn into_iter(self) -> MapIntoIter<K> {
        MapIntoIter(IntoIterator::into_iter(self))
    }
}