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

use crate::prelude::*;

pub trait DuplicateInsertsLastWinsSet<T> {
    fn new(size_hint: Option<usize>) -> Self;

    /// Insert or replace the existing value
    fn replace(&mut self, value: T);
}

#[cfg(feature = "std")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for HashSet<T, S>
where
    T: Eq + Hash,
    S: BuildHasher + Default,
{
    #[inline]
    fn new(size_hint: Option<usize>) -> Self {
        match size_hint {
            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
            None => Self::with_hasher(S::default()),
        }
    }

    #[inline]
    fn replace(&mut self, value: T) {
        // Hashset already fulfils the contract
        self.replace(value);
    }
}

#[cfg(feature = "hashbrown_0_14")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for hashbrown_0_14::HashSet<T, S>
where
    T: Eq + Hash,
    S: BuildHasher + Default,
{
    #[inline]
    fn new(size_hint: Option<usize>) -> Self {
        match size_hint {
            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
            None => Self::with_hasher(S::default()),
        }
    }

    #[inline]
    fn replace(&mut self, value: T) {
        // Hashset already fulfils the contract
        self.replace(value);
    }
}

#[cfg(feature = "indexmap_1")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for indexmap_1::IndexSet<T, S>
where
    T: Eq + Hash,
    S: BuildHasher + Default,
{
    #[inline]
    fn new(size_hint: Option<usize>) -> Self {
        match size_hint {
            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
            None => Self::with_hasher(S::default()),
        }
    }

    #[inline]
    fn replace(&mut self, value: T) {
        // Hashset already fulfils the contract
        self.replace(value);
    }
}

#[cfg(feature = "indexmap_2")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for indexmap_2::IndexSet<T, S>
where
    T: Eq + Hash,
    S: BuildHasher + Default,
{
    #[inline]
    fn new(size_hint: Option<usize>) -> Self {
        match size_hint {
            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
            None => Self::with_hasher(S::default()),
        }
    }

    #[inline]
    fn replace(&mut self, value: T) {
        // Hashset already fulfils the contract
        self.replace(value);
    }
}

impl<T> DuplicateInsertsLastWinsSet<T> for BTreeSet<T>
where
    T: Ord,
{
    #[inline]
    fn new(_size_hint: Option<usize>) -> Self {
        Self::new()
    }

    #[inline]
    fn replace(&mut self, value: T) {
        // BTreeSet already fulfils the contract
        self.replace(value);
    }
}