ordermap 0.5.10

A hash table with consistent order and fast iteration.
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

/// Create an [`OrderMap`][crate::OrderMap] from a list of key-value pairs
/// and a [`BuildHasherDefault`][core::hash::BuildHasherDefault]-wrapped custom hasher.
///
/// ## Example
///
/// ```
/// use ordermap::ordermap_with_default;
/// use fnv::FnvHasher;
///
/// let map = ordermap_with_default!{
///     FnvHasher;
///     "a" => 1,
///     "b" => 2,
/// };
/// assert_eq!(map["a"], 1);
/// assert_eq!(map["b"], 2);
/// assert_eq!(map.get("c"), None);
///
/// // "a" is the first key
/// assert_eq!(map.keys().next(), Some(&"a"));
/// ```
#[macro_export]
macro_rules! ordermap_with_default {
    ($H:ty; $($key:expr => $value:expr,)+) => { $crate::ordermap_with_default!($H; $($key => $value),+) };
    ($H:ty; $($key:expr => $value:expr),*) => {{
        let builder = ::core::hash::BuildHasherDefault::<$H>::default();
        const CAP: usize = <[()]>::len(&[$({ stringify!($key); }),*]);
        #[allow(unused_mut)]
        // Specify your custom `H` (must implement Default + Hasher) as the hasher:
        let mut map = $crate::OrderMap::with_capacity_and_hasher(CAP, builder);
        $(
            map.insert($key, $value);
        )*
        map
    }};
}

#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[macro_export]
/// Create an [`OrderMap`][crate::OrderMap] from a list of key-value pairs
///
/// ## Example
///
/// ```
/// use ordermap::ordermap;
///
/// let map = ordermap!{
///     "a" => 1,
///     "b" => 2,
/// };
/// assert_eq!(map["a"], 1);
/// assert_eq!(map["b"], 2);
/// assert_eq!(map.get("c"), None);
///
/// // "a" is the first key
/// assert_eq!(map.keys().next(), Some(&"a"));
/// ```
macro_rules! ordermap {
    ($($key:expr => $value:expr,)+) => { $crate::ordermap!($($key => $value),+) };
    ($($key:expr => $value:expr),*) => {
        {
            // Note: `stringify!($key)` is just here to consume the repetition,
            // but we throw away that string literal during constant evaluation.
            const CAP: usize = <[()]>::len(&[$({ stringify!($key); }),*]);
            let mut map = $crate::OrderMap::with_capacity(CAP);
            $(
                map.insert($key, $value);
            )*
            map
        }
    };
}

/// Create an [`OrderSet`][crate::OrderSet] from a list of values
/// and a [`BuildHasherDefault`][core::hash::BuildHasherDefault]-wrapped custom hasher.
///
/// ## Example
///
/// ```
/// use ordermap::orderset_with_default;
/// use fnv::FnvHasher;
///
/// let set = orderset_with_default!{
///     FnvHasher;
///     "a",
///     "b",
/// };
/// assert!(set.contains("a"));
/// assert!(set.contains("b"));
/// assert!(!set.contains("c"));
///
/// // "a" is the first value
/// assert_eq!(set.iter().next(), Some(&"a"));
/// ```
#[macro_export]
macro_rules! orderset_with_default {
    ($H:ty; $($value:expr,)+) => { $crate::orderset_with_default!($H; $($value),+) };
    ($H:ty; $($value:expr),*) => {{
        let builder = ::core::hash::BuildHasherDefault::<$H>::default();
        const CAP: usize = <[()]>::len(&[$({ stringify!($value); }),*]);
        #[allow(unused_mut)]
        // Specify your custom `H` (must implement Default + Hash) as the hasher:
        let mut set = $crate::OrderSet::with_capacity_and_hasher(CAP, builder);
        $(
            set.insert($value);
        )*
        set
    }};
}

#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[macro_export]
/// Create an [`OrderSet`][crate::OrderSet] from a list of values
///
/// ## Example
///
/// ```
/// use ordermap::orderset;
///
/// let set = orderset!{
///     "a",
///     "b",
/// };
/// assert!(set.contains("a"));
/// assert!(set.contains("b"));
/// assert!(!set.contains("c"));
///
/// // "a" is the first value
/// assert_eq!(set.iter().next(), Some(&"a"));
/// ```
macro_rules! orderset {
    ($($value:expr,)+) => { $crate::orderset!($($value),+) };
    ($($value:expr),*) => {
        {
            // Note: `stringify!($value)` is just here to consume the repetition,
            // but we throw away that string literal during constant evaluation.
            const CAP: usize = <[()]>::len(&[$({ stringify!($value); }),*]);
            let mut set = $crate::OrderSet::with_capacity(CAP);
            $(
                set.insert($value);
            )*
            set
        }
    };
}