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<Ret, A, B, C, D, E, F> Hash for unsafe fn(A, B, C, D, E, F) -> Ret
[src]
impl<T> Hash for [T; 4] where
T: Hash,
[src]
T: Hash,
impl Hash for u128
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impl<Ret, A> Hash for extern "C" fn(A) -> Ret
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impl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D) -> Ret
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impl<Ret, A, B> Hash for fn(A, B) -> 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, 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; 0] where
T: Hash,
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T: Hash,
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
[src]
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> Hash for extern "C" fn(A, B, C, D, E) -> Ret
[src]
impl<T> Hash for [T; 13] 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<Ret> Hash for extern "C" fn() -> 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> Hash for fn(A) -> 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
[src]
impl<Ret, A> Hash for unsafe fn(A) -> Ret
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impl<Ret, A, B> Hash for extern "C" fn(A, B, ...) -> Ret
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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
[src]
impl<T> Hash for PhantomData<T> where
T: ?Sized,
[src]
T: ?Sized,
impl<Idx> Hash for RangeFrom<Idx> where
Idx: Hash,
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Idx: Hash,
impl<Ret, A, B> Hash for unsafe fn(A, B) -> Ret
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impl<Ret> Hash for fn() -> Ret
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impl<A, B, C, D> Hash for (A, B, C, D) where
A: Hash,
B: Hash,
C: Hash,
D: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash + ?Sized,
impl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G) -> Ret
[src]
impl<Idx> Hash for RangeInclusive<Idx> where
Idx: Hash,
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Idx: Hash,
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
[src]
impl<Ret, A, B, C, D> Hash for fn(A, B, C, D) -> Ret
[src]
impl<T> Hash for ManuallyDrop<T> where
T: Hash,
[src]
T: Hash,
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
[src]
impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F, ...) -> Ret
[src]
impl<T> Hash for [T; 1] where
T: Hash,
[src]
T: Hash,
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
[src]
impl<T> Hash for [T; 21] where
T: Hash,
[src]
T: Hash,
impl Hash for u64
[src]
impl<Ret, A, B, C, D, E, F> Hash for fn(A, B, C, D, E, F) -> Ret
[src]
impl<T> Hash for [T; 27] where
T: Hash,
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T: Hash,
impl<T> Hash for Discriminant<T>
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impl Hash for ()
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impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B, ...) -> 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<T, E> Hash for Result<T, E> where
E: Hash,
T: Hash,
[src]
E: Hash,
T: Hash,
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
[src]
impl<Idx> Hash for RangeToInclusive<Idx> where
Idx: Hash,
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Idx: Hash,
impl<T> Hash for [T] 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
[src]
impl<T> Hash for [T; 28] where
T: Hash,
[src]
T: Hash,
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
[src]
impl<T> Hash for [T; 22] where
T: Hash,
[src]
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
[src]
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
[src]
impl<'a, T> Hash for &'a mut T where
T: Hash + ?Sized,
[src]
T: Hash + ?Sized,
impl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D, ...) -> Ret
[src]
impl<T> Hash for [T; 16] where
T: Hash,
[src]
T: Hash,
impl<Idx> Hash for Range<Idx> where
Idx: Hash,
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Idx: 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
[src]
impl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D) -> Ret
[src]
impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B) -> Ret
[src]
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; 15] where
T: Hash,
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T: Hash,
impl<T> Hash for [T; 6] 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<T> Hash for [T; 26] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D, E, F, G> Hash for fn(A, B, C, D, E, F, G) -> Ret
[src]
impl Hash for char
[src]
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
[src]
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> Hash for extern "C" fn(A, ...) -> Ret
[src]
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
[src]
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
[src]
impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E, ...) -> Ret
[src]
impl<T> Hash for [T; 29] where
T: Hash,
[src]
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
[src]
impl<T> Hash for [T; 25] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E) -> Ret
[src]
impl<T> Hash for [T; 24] where
T: Hash,
[src]
T: Hash,
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 u8
[src]
impl Hash for RangeFull
[src]
impl<'a, T> Hash for &'a T where
T: Hash + ?Sized,
[src]
T: Hash + ?Sized,
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
[src]
impl<T> Hash for [T; 20] where
T: Hash,
[src]
T: Hash,
impl Hash for Error
[src]
impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C, ...) -> Ret
[src]
impl<T> Hash for [T; 7] where
T: Hash,
[src]
T: Hash,
impl Hash for u32
[src]
impl<Ret> Hash for unsafe fn() -> Ret
[src]
impl<T> Hash for NonZero<T> where
T: Zeroable + Hash,
[src]
T: Zeroable + Hash,
impl<Ret, A, B, C> Hash for unsafe fn(A, B, C) -> Ret
[src]
impl<T> Hash for [T; 32] where
T: Hash,
[src]
T: Hash,
impl Hash for i128
[src]
impl Hash for str
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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
[src]
impl<Y, R> Hash for GeneratorState<Y, R> where
R: Hash,
Y: Hash,
[src]
R: Hash,
Y: Hash,
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,
[src]
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 Hash for u16
[src]
impl<T> Hash for [T; 9] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D, ...) -> Ret
[src]
impl<T> Hash for [T; 30] where
T: Hash,
[src]
T: Hash,
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
[src]
impl<T> Hash for Wrapping<T> where
T: Hash,
[src]
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
[src]
impl<T> Hash for [T; 8] where
T: Hash,
[src]
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
[src]
impl Hash for isize
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impl Hash for i64
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impl<Ret, A, B> Hash for extern "C" fn(A, B) -> Ret
[src]
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,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash,
G: Hash + ?Sized,
impl<T> Hash for [T; 10] where
T: Hash,
[src]
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
[src]
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<T> Hash for *const T
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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
[src]
impl Hash for i8
[src]
impl<T> Hash for [T; 17] where
T: Hash,
[src]
T: Hash,
impl Hash for usize
[src]
impl Hash for i32
[src]
impl<T> Hash for [T; 11] where
T: Hash,
[src]
T: Hash,
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
[src]
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,
[src]
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash,
F: Hash + ?Sized,
impl<T> Hash for [T; 12] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret
[src]
impl<T> Hash for [T; 18] where
T: Hash,
[src]
T: Hash,
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 Hash for TypeId
[src]
impl<A, B> Hash for (A, B) where
A: Hash,
B: Hash + ?Sized,
[src]
A: Hash,
B: Hash + ?Sized,
impl<Ret, A, B, C, D, E> Hash for fn(A, B, C, D, E) -> Ret
[src]
impl<T> Hash for Option<T> where
T: Hash,
[src]
T: Hash,
impl<Idx> Hash for RangeTo<Idx> where
Idx: Hash,
[src]
Idx: Hash,
impl<Ret> Hash for unsafe extern "C" fn() -> Ret
[src]
impl<Ret, A, B, C, D, E, F, G, H> Hash for fn(A, B, C, D, E, F, G, H) -> Ret
[src]
impl<T> Hash for [T; 19] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D, E> Hash for unsafe fn(A, B, C, D, E) -> Ret
[src]
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
[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<T> Hash for [T; 3] where
T: Hash,
[src]
T: Hash,
impl<Ret, A> Hash for unsafe extern "C" fn(A, ...) -> Ret
[src]
impl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
[src]
impl<T> Hash for *mut T
[src]
impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C) -> Ret
[src]
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,
[src]
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, G, H> Hash for unsafe fn(A, B, C, D, E, F, G, H) -> Ret
[src]
impl<T> Hash for [T; 23] where
T: Hash,
[src]
T: Hash,
impl<A> Hash for (A,) where
A: Hash + ?Sized,
[src]
A: Hash + ?Sized,
impl<Ret, A, B, C> Hash for fn(A, B, C) -> Ret
[src]
impl<T> Hash for [T; 14] where
T: Hash,
[src]
T: Hash,
impl<T> Hash for [T; 5] where
T: Hash,
[src]
T: Hash,
impl<Ret, A, B, C, D> Hash for unsafe fn(A, B, C, D) -> Ret
[src]
impl<Ret, A, B, C, D, E, F, G> Hash for unsafe fn(A, B, C, D, E, F, G) -> Ret
[src]
impl<A, B, C> Hash for (A, B, C) where
A: Hash,
B: Hash,
C: Hash + ?Sized,
[src]
A: Hash,
B: Hash,
C: Hash + ?Sized,
impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C) -> Ret
[src]
impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret
[src]
impl Hash for i16
[src]
impl<T> Hash for [T; 2] where
T: Hash,
[src]
T: Hash,
impl Hash for bool
[src]
impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F) -> Ret
[src]
impl Hash for String
[src]
impl<T> Hash for LinkedList<T> where
T: Hash,
[src]
T: Hash,
impl<'a, B> Hash for Cow<'a, B> where
B: Hash + ToOwned + ?Sized,
[src]
B: Hash + ToOwned + ?Sized,
impl<T> Hash for Bound<T> where
T: Hash,
[src]
T: Hash,
impl<T> Hash for Vec<T> where
T: Hash,
[src]
T: Hash,
impl<A> Hash for VecDeque<A> where
A: Hash,
[src]
A: Hash,
impl<T> Hash for BTreeSet<T> where
T: Hash,
[src]
T: Hash,
impl<T> Hash for Box<T> where
T: Hash + ?Sized,
[src]
T: Hash + ?Sized,