Trait std_prelude::Hash 1.0.0
[−]
[src]
pub trait Hash { fn hash<H>(&self, state: &mut H)
where
H: Hasher; fn hash_slice<H>(data: &[Self], state: &mut H)
where
H: Hasher, { ... } }
A hashable type.
Types implementing Hash
are able to be hash
ed with an instance of
Hasher
.
Implementing Hash
You can derive Hash
with #[derive(Hash)]
if all fields implement Hash
.
The resulting hash will be the combination of the values from calling
hash
on each field.
#[derive(Hash)] struct Rustacean { name: String, country: String, }
If you need more control over how a value is hashed, you can of course
implement the Hash
trait yourself:
use std::hash::{Hash, Hasher}; struct Person { id: u32, name: String, phone: u64, } impl Hash for Person { fn hash<H: Hasher>(&self, state: &mut H) { self.id.hash(state); self.phone.hash(state); } }
Hash
and Eq
When implementing both Hash
and Eq
, it is important that the following
property holds:
k1 == k2 -> hash(k1) == hash(k2)
In other words, if two keys are equal, their hashes must also be equal.
HashMap
and HashSet
both rely on this behavior.
Thankfully, you won't need to worry about upholding this property when
deriving both Eq
and Hash
with #[derive(PartialEq, Eq, Hash)]
.
Required Methods
Provided Methods
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0
H: Hasher,
Implementations on Foreign Types
impl Hash for char
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impl<T> Hash for [T; 2] where
T: Hash,
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T: Hash,
impl<A, B> Hash for (A, B) where
A: Hash,
B: Hash + ?Sized,
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A: Hash,
B: Hash + ?Sized,
impl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D, ...) -> Ret
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impl<A, B, C, D, E, F, G, H, I, J> Hash for (A, B, C, D, E, F, G, H, I, J) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F) -> Ret
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impl Hash for u32
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impl<Ret, A> Hash for fn(A) -> Ret
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impl<Y, R> Hash for GeneratorState<Y, R> where
R: Hash,
Y: Hash,
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R: Hash,
Y: Hash,
impl Hash for usize
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impl<T> Hash for [T; 1] where
T: Hash,
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T: Hash,
impl<Ret, A> Hash for extern "C" fn(A, ...) -> Ret
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impl<Ret, A, B, C> Hash for unsafe fn(A, B, C) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for unsafe fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret
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impl<Idx> Hash for RangeFrom<Idx> where
Idx: Hash,
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Idx: Hash,
impl Hash for i8
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impl<Ret> Hash for extern "C" fn() -> Ret
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impl<Ret, A> Hash for unsafe fn(A) -> Ret
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impl<A, B, C, D, E, F, G, H, I, J, K, L> Hash for (A, B, C, D, E, F, G, H, I, J, K, L) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash,
K: Hash,
L: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash,
K: Hash,
L: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for fn(A, B, C, D, E, F, G, H, I, J) -> Ret
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impl<T> Hash for [T; 17] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
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impl<T> Hash for [T; 29] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret
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impl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D, ...) -> Ret
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impl<T> Hash for [T; 9] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret
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impl<A, B, C, D, E, F, G> Hash for (A, B, C, D, E, F, G) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash + ?Sized,
impl<T> Hash for [T; 16] where
T: Hash,
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T: Hash,
impl<A, B, C> Hash for (A, B, C) where
A: Hash,
B: Hash,
C: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash + ?Sized,
impl<'a, T> Hash for &'a mut T where
T: Hash + ?Sized,
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T: Hash + ?Sized,
impl<T> Hash for [T; 5] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C, ...) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Ret
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impl<T> Hash for [T; 19] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 27] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 28] where
T: Hash,
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T: Hash,
impl Hash for i64
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impl<Ret, A, B, C, D, E, F, G> Hash for unsafe fn(A, B, C, D, E, F, G) -> Ret
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impl<Ret, A, B, C, D> Hash for fn(A, B, C, D) -> Ret
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impl<T> Hash for Discriminant<T>
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impl<Ret, A> Hash for unsafe extern "C" fn(A, ...) -> Ret
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impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B, ...) -> Ret
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impl<'a, T> Hash for &'a T where
T: Hash + ?Sized,
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T: Hash + ?Sized,
impl<T> Hash for [T; 4] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 13] where
T: Hash,
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T: Hash,
impl<T> Hash for *mut T
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impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Ret
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impl<T> Hash for [T; 18] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 20] where
T: Hash,
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T: Hash,
impl<A, B, C, D> Hash for (A, B, C, D) where
A: Hash,
B: Hash,
C: Hash,
D: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash,
D: Hash + ?Sized,
impl<T> Hash for Option<T> where
T: Hash,
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T: Hash,
impl<Ret, A, B> Hash for extern "C" fn(A, B, ...) -> Ret
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impl<Ret, A, B, C, D, E> Hash for unsafe fn(A, B, C, D, E) -> Ret
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impl Hash for i16
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impl<Ret, A, B, C, D, E, F, G, H, I> Hash for unsafe fn(A, B, C, D, E, F, G, H, I) -> Ret
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impl Hash for TypeId
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impl<T> Hash for PhantomData<T> where
T: ?Sized,
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T: ?Sized,
impl<T> Hash for [T; 14] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
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impl<Ret, A> Hash for extern "C" fn(A) -> Ret
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impl<T> Hash for [T; 26] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 8] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H> Hash for fn(A, B, C, D, E, F, G, H) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for unsafe fn(A, B, C, D, E, F, G, H, I, J) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
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impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C) -> Ret
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impl<T> Hash for [T; 10] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 7] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Ret
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impl<Ret, A> Hash for unsafe extern "C" fn(A) -> Ret
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impl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
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impl Hash for u16
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impl<T> Hash for NonZero<T> where
T: Zeroable + Hash,
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T: Zeroable + Hash,
impl<T> Hash for [T; 23] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H, I> Hash for fn(A, B, C, D, E, F, G, H, I) -> Ret
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impl Hash for i128
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impl<Ret> Hash for unsafe extern "C" fn() -> Ret
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impl<T> Hash for [T; 32] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 31] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 24] where
T: Hash,
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T: Hash,
impl<Ret, A, B> Hash for unsafe fn(A, B) -> Ret
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impl<A, B, C, D, E, F, G, H> Hash for (A, B, C, D, E, F, G, H) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret
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impl<A, B, C, D, E, F> Hash for (A, B, C, D, E, F) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash + ?Sized,
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A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Ret
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impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C) -> Ret
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impl<A, B, C, D, E, F, G, H, I, J, K> Hash for (A, B, C, D, E, F, G, H, I, J, K) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash,
K: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash,
J: Hash,
K: Hash + ?Sized,
impl Hash for i32
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impl<Ret> Hash for fn() -> Ret
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impl Hash for RangeFull
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impl<Ret, A, B, C, D> Hash for unsafe fn(A, B, C, D) -> Ret
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impl<T, E> Hash for Result<T, E> where
E: Hash,
T: Hash,
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E: Hash,
T: Hash,
impl<Ret, A, B, C, D, E, F> Hash for fn(A, B, C, D, E, F) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Ret
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impl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G) -> Ret
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impl<T> Hash for [T; 15] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Ret
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impl<Ret, A, B, C, D, E, F> Hash for unsafe fn(A, B, C, D, E, F) -> Ret
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impl<Ret, A, B, C, D, E, F, G> Hash for fn(A, B, C, D, E, F, G) -> Ret
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impl<T> Hash for [T; 3] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 0] where
T: Hash,
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T: Hash,
impl Hash for str
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impl<T> Hash for [T; 22] where
T: Hash,
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T: Hash,
impl<Idx> Hash for RangeTo<Idx> where
Idx: Hash,
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Idx: Hash,
impl Hash for isize
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impl<Ret, A, B, C, D, E, F, G, H, I> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Ret
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impl<Ret, A, B, C, D, E> Hash for fn(A, B, C, D, E) -> Ret
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impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E, ...) -> Ret
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impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret
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impl<Ret, A, B> Hash for extern "C" fn(A, B) -> Ret
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impl<Ret> Hash for unsafe fn() -> Ret
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impl<T> Hash for [T; 25] where
T: Hash,
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T: Hash,
impl<A, B, C, D, E, F, G, H, I> Hash for (A, B, C, D, E, F, G, H, I) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash,
H: Hash,
I: Hash + ?Sized,
impl Hash for u64
[src]
impl<T> Hash for [T] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 30] where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D, E, F, G, H> Hash for unsafe fn(A, B, C, D, E, F, G, H) -> Ret
[src]
impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E) -> Ret
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impl<T> Hash for [T; 6] where
T: Hash,
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T: Hash,
impl<A, B, C, D, E> Hash for (A, B, C, D, E) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Ret
[src]
impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H> Hash for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret
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impl Hash for ()
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impl Hash for Error
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impl<Ret, A, B, C> Hash for fn(A, B, C) -> Ret
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impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F, ...) -> Ret
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impl<A> Hash for (A,) where
A: Hash + ?Sized,
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A: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F, G, H> Hash for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
[src]
impl<T> Hash for [T; 11] where
T: Hash,
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T: Hash,
impl Hash for u8
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impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C, ...) -> Ret
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impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Hash for fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
[src]
impl<Ret, A, B, C, D, E, F, G> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
[src]
impl<Ret, A, B> Hash for fn(A, B) -> Ret
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impl<T> Hash for ManuallyDrop<T> where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 12] where
T: Hash,
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T: Hash,
impl<T> Hash for *const T
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impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret
[src]
impl<Idx> Hash for RangeToInclusive<Idx> where
Idx: Hash,
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Idx: Hash,
impl<Idx> Hash for RangeInclusive<Idx> where
Idx: Hash,
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Idx: Hash,
impl<T> Hash for [T; 21] where
T: Hash,
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T: Hash,
impl Hash for bool
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impl Hash for u128
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impl<T> Hash for Wrapping<T> where
T: Hash,
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T: Hash,
impl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D) -> Ret
[src]
impl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D) -> Ret
[src]
impl<Idx> Hash for Range<Idx> where
Idx: Hash,
[src]
Idx: Hash,
impl<T> Hash for Box<T> where
T: Hash + ?Sized,
[src]
T: Hash + ?Sized,
impl<T> Hash for LinkedList<T> where
T: Hash,
[src]
T: Hash,
impl<T> Hash for Bound<T> where
T: Hash,
[src]
T: Hash,
impl Hash for String
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impl<A> Hash for VecDeque<A> where
A: Hash,
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A: Hash,
impl<T> Hash for BTreeSet<T> where
T: Hash,
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T: Hash,
impl<T> Hash for Vec<T> where
T: Hash,
[src]
T: Hash,
impl Hash for SocketAddr
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impl Hash for Ipv6Addr
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impl<'a> Hash for Prefix<'a>
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impl Hash for SocketAddrV6
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impl<'a> Hash for PrefixComponent<'a>
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impl Hash for OsStr
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impl Hash for CStr
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impl Hash for ErrorKind
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impl Hash for FileType
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impl<'a> Hash for Component<'a>
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impl Hash for Ipv4Addr
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impl Hash for ThreadId
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impl Hash for IpAddr
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impl Hash for SocketAddrV4
[src]
impl Hash for CString
[src]
impl Hash for Ipv6MulticastScope
[src]
Implementors
impl Hash for Ordering
impl<T> Hash for Arc<T> where
T: Hash + ?Sized,impl<'a, B> Hash for Cow<'a, B> where
B: Hash + ToOwned + ?Sized,impl<T> Hash for Rc<T> where
T: Hash + ?Sized,impl<K, V> Hash for BTreeMap<K, V> where
K: Hash,
V: Hash,impl Hash for OsString
impl Hash for PathBuf
impl Hash for Duration
impl Hash for Path