Trait enso_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, { ... } }
Expand description
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[src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]Feeds a slice of this type into the given Hasher
.
This method is meant as a convenience, but its implementation is
also explicitly left unspecified. It isn’t guaranteed to be
equivalent to repeated calls of hash
and implementations of
Hash
should keep that in mind and call hash
themselves
if the slice isn’t treated as a whole unit in the PartialEq
implementation.
For example, a VecDeque
implementation might naïvely call
as_slices
and then hash_slice
on each slice, but this
is wrong since the two slices can change with a call to
make_contiguous
without affecting the PartialEq
result. Since these slices aren’t treated as singular
units, and instead part of a larger deque, this method cannot
be used.
Examples
use std::collections::hash_map::DefaultHasher; use std::hash::{Hash, Hasher}; let mut hasher = DefaultHasher::new(); let numbers = [6, 28, 496, 8128]; Hash::hash_slice(&numbers, &mut hasher); println!("Hash is {:x}!", hasher.finish());
Implementations on Foreign Types
impl Hash for Ipv6MulticastScope
[src]
impl Hash for Ipv6MulticastScope
[src]impl<Y, R> Hash for GeneratorState<Y, R> where
R: Hash,
Y: Hash,
[src]
impl<Y, R> Hash for GeneratorState<Y, R> where
R: Hash,
Y: Hash,
[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 unsafe extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret
[src]impl<A, B, C, D, E, F> Hash for (A, B, C, D, E, F) where
C: Hash,
F: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
[src]
impl<A, B, C, D, E, F> Hash for (A, B, C, D, E, F) where
C: Hash,
F: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
[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, 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, 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<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<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<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<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<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<A, B, C, D, E, F, G, H, I, J> Hash for (A, B, C, D, E, F, G, H, I, J) where
C: Hash,
F: Hash,
I: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
J: Hash + ?Sized,
G: Hash,
H: Hash,
[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
C: Hash,
F: Hash,
I: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
J: Hash + ?Sized,
G: Hash,
H: Hash,
[src]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
C: Hash,
F: Hash,
I: Hash,
K: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
L: Hash + ?Sized,
J: Hash,
G: Hash,
H: Hash,
[src]
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
C: Hash,
F: Hash,
I: Hash,
K: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
L: Hash + ?Sized,
J: Hash,
G: Hash,
H: Hash,
[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, 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, G, H, I, J, K> Hash for (A, B, C, D, E, F, G, H, I, J, K) where
C: Hash,
F: Hash,
I: Hash,
K: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
J: Hash,
G: Hash,
H: Hash,
[src]
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
C: Hash,
F: Hash,
I: Hash,
K: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
J: Hash,
G: Hash,
H: Hash,
[src]impl<A, B, C, D, E> Hash for (A, B, C, D, E) where
C: Hash,
E: Hash + ?Sized,
A: Hash,
B: Hash,
D: Hash,
[src]
impl<A, B, C, D, E> Hash for (A, B, C, D, E) where
C: Hash,
E: Hash + ?Sized,
A: Hash,
B: Hash,
D: Hash,
[src]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, 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, 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<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<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, 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, 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<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<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, 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, 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, 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, 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, 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, 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, K, L> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Ret
[src]impl<A, B, C, D, E, F, G> Hash for (A, B, C, D, E, F, G) where
C: Hash,
F: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash + ?Sized,
[src]
impl<A, B, C, D, E, F, G> Hash for (A, B, C, D, E, F, G) where
C: Hash,
F: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash + ?Sized,
[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 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> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
[src]
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, 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<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<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, 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, 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, H, I, J, K, L> Hash for fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
[src]impl<Dyn> Hash for DynMetadata<Dyn> where
Dyn: ?Sized,
[src]
impl<Dyn> Hash for DynMetadata<Dyn> where
Dyn: ?Sized,
[src]impl<A, B, C, D, E, F, G, H> Hash for (A, B, C, D, E, F, G, H) where
C: Hash,
F: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash,
H: Hash + ?Sized,
[src]
impl<A, B, C, D, E, F, G, H> Hash for (A, B, C, D, E, F, G, H) where
C: Hash,
F: Hash,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash,
H: Hash + ?Sized,
[src]impl<A, B, C, D, E, F, G, H, I> Hash for (A, B, C, D, E, F, G, H, I) where
C: Hash,
F: Hash,
I: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash,
H: Hash,
[src]
impl<A, B, C, D, E, F, G, H, I> Hash for (A, B, C, D, E, F, G, H, I) where
C: Hash,
F: Hash,
I: Hash + ?Sized,
E: Hash,
A: Hash,
B: Hash,
D: Hash,
G: Hash,
H: Hash,
[src]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, 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<T> Hash for LinkedList<T> where
T: Hash,
[src]
impl<T> Hash for LinkedList<T> where
T: Hash,
[src]impl Hash for RelocationTarget
[src]
impl Hash for RelocationTarget
[src]impl<'data> Hash for CompressedData<'data>
[src]
impl<'data> Hash for CompressedData<'data>
[src]impl Hash for CompressedFileRange
[src]
impl Hash for CompressedFileRange
[src]impl<'data> Hash for ObjectMapEntry<'data>
[src]
impl<'data> Hash for ObjectMapEntry<'data>
[src]impl Hash for CompressionFormat
[src]
impl Hash for CompressionFormat
[src]impl<'data> Hash for SymbolMapName<'data>
[src]
impl<'data> Hash for SymbolMapName<'data>
[src]impl<A, B> Hash for EitherOrBoth<A, B> where
A: Hash,
B: Hash,
[src]
impl<A, B> Hash for EitherOrBoth<A, B> where
A: Hash,
B: Hash,
[src]impl<T, R, const D: usize> Hash for Isometry<T, R, D> where
T: Scalar + Hash,
R: Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]
impl<T, R, const D: usize> Hash for Isometry<T, R, D> where
T: Scalar + Hash,
R: Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]impl<T, R, const D: usize> Hash for Similarity<T, R, D> where
T: Scalar + Hash,
R: Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]
impl<T, R, const D: usize> Hash for Similarity<T, R, D> where
T: Scalar + Hash,
R: Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]impl<T, R, C, S> Hash for Matrix<T, R, C, S> where
C: Dim,
T: Scalar + Hash,
R: Dim,
S: Storage<T, R, C>,
[src]
impl<T, R, C, S> Hash for Matrix<T, R, C, S> where
C: Dim,
T: Scalar + Hash,
R: Dim,
S: Storage<T, R, C>,
[src]impl<T> Hash for Quaternion<T> where
T: Scalar + Hash,
[src]
impl<T> Hash for Quaternion<T> where
T: Scalar + Hash,
[src]impl<T, const D: usize> Hash for Rotation<T, D> where
T: Scalar + Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<D>>>::Buffer: Hash,
[src]
impl<T, const D: usize> Hash for Rotation<T, D> where
T: Scalar + Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<D>>>::Buffer: Hash,
[src]impl<T, const D: usize> Hash for Translation<T, D> where
T: Scalar + Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]
impl<T, const D: usize> Hash for Translation<T, D> where
T: Scalar + Hash,
<DefaultAllocator as Allocator<T, Const<D>, Const<1_usize>>>::Buffer: Hash,
[src]Implementors
impl<Idx> Hash for RangeInclusive<Idx> where
Idx: Hash,
1.26.0[src]
impl<Idx> Hash for RangeInclusive<Idx> where
Idx: Hash,
1.26.0[src]impl<Idx> Hash for RangeToInclusive<Idx> where
Idx: Hash,
1.26.0[src]
impl<Idx> Hash for RangeToInclusive<Idx> where
Idx: Hash,
1.26.0[src]impl<T> Hash for Discriminant<T>
1.21.0[src]
impl<T> Hash for Discriminant<T>
1.21.0[src]impl<T> Hash for ManuallyDrop<T> where
T: Hash + ?Sized,
1.20.0[src]
impl<T> Hash for ManuallyDrop<T> where
T: Hash + ?Sized,
1.20.0[src]impl<T> Hash for PhantomData<T> where
T: ?Sized,
[src]
impl<T> Hash for PhantomData<T> where
T: ?Sized,
[src]