/rust/registry/src/index.crates.io-1949cf8c6b5b557f/hashbrown-0.16.1/src/hasher.rs
Line | Count | Source |
1 | | #[cfg(feature = "default-hasher")] |
2 | | use { |
3 | | core::hash::{BuildHasher, Hasher}, |
4 | | foldhash::fast::RandomState, |
5 | | }; |
6 | | |
7 | | /// Default hash builder for the `S` type parameter of |
8 | | /// [`HashMap`](crate::HashMap) and [`HashSet`](crate::HashSet). |
9 | | /// |
10 | | /// This only implements `BuildHasher` when the "default-hasher" crate feature |
11 | | /// is enabled; otherwise it just serves as a placeholder, and a custom `S` type |
12 | | /// must be used to have a fully functional `HashMap` or `HashSet`. |
13 | | #[derive(Clone, Debug, Default)] |
14 | | pub struct DefaultHashBuilder { |
15 | | #[cfg(feature = "default-hasher")] |
16 | | inner: RandomState, |
17 | | } |
18 | | |
19 | | #[cfg(feature = "default-hasher")] |
20 | | impl BuildHasher for DefaultHashBuilder { |
21 | | type Hasher = DefaultHasher; |
22 | | |
23 | | #[inline(always)] |
24 | 2.82M | fn build_hasher(&self) -> Self::Hasher { |
25 | 2.82M | DefaultHasher { |
26 | 2.82M | inner: self.inner.build_hasher(), |
27 | 2.82M | } |
28 | 2.82M | } |
29 | | } |
30 | | |
31 | | /// Default hasher for [`HashMap`](crate::HashMap) and [`HashSet`](crate::HashSet). |
32 | | #[cfg(feature = "default-hasher")] |
33 | | #[derive(Clone)] |
34 | | pub struct DefaultHasher { |
35 | | inner: <RandomState as BuildHasher>::Hasher, |
36 | | } |
37 | | |
38 | | #[cfg(feature = "default-hasher")] |
39 | | macro_rules! forward_writes { |
40 | | ($( $write:ident ( $ty:ty ) , )*) => {$( |
41 | | #[inline(always)] |
42 | 5.94M | fn $write(&mut self, arg: $ty) { |
43 | 5.94M | self.inner.$write(arg); |
44 | 5.94M | } <hashbrown::hasher::DefaultHasher as core::hash::Hasher>::write_usize Line | Count | Source | 42 | 591k | fn $write(&mut self, arg: $ty) { | 43 | 591k | self.inner.$write(arg); | 44 | 591k | } |
<hashbrown::hasher::DefaultHasher as core::hash::Hasher>::write Line | Count | Source | 42 | 591k | fn $write(&mut self, arg: $ty) { | 43 | 591k | self.inner.$write(arg); | 44 | 591k | } |
<hashbrown::hasher::DefaultHasher as core::hash::Hasher>::write_u32 Line | Count | Source | 42 | 3.11M | fn $write(&mut self, arg: $ty) { | 43 | 3.11M | self.inner.$write(arg); | 44 | 3.11M | } |
<hashbrown::hasher::DefaultHasher as core::hash::Hasher>::write_u64 Line | Count | Source | 42 | 1.65M | fn $write(&mut self, arg: $ty) { | 43 | 1.65M | self.inner.$write(arg); | 44 | 1.65M | } |
|
45 | | )*} |
46 | | } |
47 | | |
48 | | #[cfg(feature = "default-hasher")] |
49 | | impl Hasher for DefaultHasher { |
50 | | forward_writes! { |
51 | | write(&[u8]), |
52 | | write_u8(u8), |
53 | | write_u16(u16), |
54 | | write_u32(u32), |
55 | | write_u64(u64), |
56 | | write_u128(u128), |
57 | | write_usize(usize), |
58 | | write_i8(i8), |
59 | | write_i16(i16), |
60 | | write_i32(i32), |
61 | | write_i64(i64), |
62 | | write_i128(i128), |
63 | | write_isize(isize), |
64 | | } |
65 | | |
66 | | // feature(hasher_prefixfree_extras) |
67 | | #[cfg(feature = "nightly")] |
68 | | forward_writes! { |
69 | | write_length_prefix(usize), |
70 | | write_str(&str), |
71 | | } |
72 | | |
73 | | #[inline(always)] |
74 | 2.82M | fn finish(&self) -> u64 { |
75 | 2.82M | self.inner.finish() |
76 | 2.82M | } |
77 | | } |