Trait std::hash::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 hashed 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, }Run
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); } }Run
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<T> Hash for NonZero<T> where
T: Zeroable + Hash, [src]
impl<T> Hash for NonZero<T> where
T: Zeroable + Hash, Implementors
impl<T> Hash for [T; 25] where
T: Hash,impl Hash for Durationimpl Hash for i64x4impl<'a, T> Hash for &'a mut T where
T: 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) -> Retimpl<Ret, A, B, C, D, E, F, G> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<T> Hash for [T; 21] where
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, ...) -> Retimpl<T> Hash for [T; 10] where
T: Hash,impl Hash for u8impl Hash for i8x8impl<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,impl Hash for u128impl<T> Hash for [T; 19] where
T: Hash,impl Hash for u16x8impl Hash for i8x2impl<T> Hash for [T; 28] where
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) -> Retimpl<Ret, A, B, C, D, E, F, G> Hash for fn(A, B, C, D, E, F, G) -> Retimpl Hash for u8x8impl Hash for u16x16impl Hash for NonZeroIsizeimpl Hash for NonZeroI8impl Hash for NonZeroU64impl<T> Hash for [T; 9] where
T: Hash,impl<Ret, A, B, C, D, E, F> Hash for unsafe fn(A, B, C, D, E, F) -> Retimpl<Ret, A> Hash for unsafe extern "C" fn(A, ...) -> Retimpl<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) -> Retimpl Hash for NonZeroI16impl<Ret, A, B, C> Hash for unsafe fn(A, B, C) -> Retimpl<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, ...) -> Retimpl<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, ...) -> Retimpl<T> Hash for ManuallyDrop<T> where
T: Hash,impl<T> Hash for Wrapping<T> where
T: Hash,impl Hash for usizeimpl<T> Hash for [T; 1] where
T: Hash,impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C) -> Retimpl Hash for u16impl<T> Hash for [T; 15] where
T: Hash,impl Hash for u16x4impl<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,impl<Ret> Hash for unsafe extern "C" fn() -> Retimpl<Ret, A, B, C, D> Hash for fn(A, B, C, D) -> Retimpl Hash for i64x8impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B) -> Retimpl<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) -> Retimpl Hash for u64x4impl<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) -> Retimpl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E> Hash for fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D) -> Retimpl<T> Hash for Option<T> where
T: Hash,impl<T> Hash for [T; 18] where
T: Hash,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) -> Retimpl Hash for i8impl<T> Hash for [T; 29] where
T: Hash,impl Hash for NonZeroU16impl Hash for RangeFullimpl<Ret, A> Hash for unsafe fn(A) -> Retimpl<T> Hash for [T; 11] where
T: Hash,impl<Ret, A> Hash for extern "C" fn(A) -> Retimpl Hash for u8x16impl Hash for i16impl Hash for i32x4impl<Ret, A, B, C, D, E, F, G, H> Hash for extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl Hash for i16x2impl Hash for u8x32impl<A, B, C, D> Hash for (A, B, C, D) where
A: Hash,
B: Hash,
C: Hash,
D: Hash + ?Sized,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) -> Retimpl<T> Hash for [T; 2] where
T: Hash,impl Hash for NonZeroU128impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E, F, G> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Retimpl Hash for boolimpl Hash for u8x2impl<T> Hash for Discriminant<T>impl<T> Hash for [T; 8] where
T: Hash,impl Hash for u64x8impl Hash for i32x8impl<T> Hash for [T; 12] where
T: Hash,impl Hash for i8x32impl<T> Hash for [T; 24] where
T: Hash,impl Hash for u32x4impl Hash for Errorimpl<T> Hash for [T; 5] where
T: Hash,impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E, ...) -> Retimpl<Idx> Hash for RangeToInclusive<Idx> where
Idx: Hash,impl Hash for i16x16impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E) -> Retimpl<T> Hash for [T; 0] where
T: Hash,impl<T> Hash for Bound<T> where
T: Hash,impl<T> Hash for [T; 27] where
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) -> Retimpl Hash for NonZeroU32impl<Ret, A, B, C, D> Hash for unsafe fn(A, B, C, D) -> Retimpl Hash for i8x16impl Hash for ()impl<A> Hash for (A,) where
A: Hash + ?Sized,impl Hash for i32x2impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E, ...) -> Retimpl Hash for i32x16impl<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, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Hash for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<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, ...) -> Retimpl<T, E> Hash for Result<T, E> where
E: Hash,
T: Hash,impl<Ret, A, B, C, D, E, F, G, H> Hash for fn(A, B, C, D, E, F, G, H) -> Retimpl Hash for i32impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B, ...) -> Retimpl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D, ...) -> Retimpl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Hash for u32x8impl<T> Hash for NonNull<T> where
T: ?Sized,impl<Idx> Hash for RangeInclusive<Idx> where
Idx: Hash,impl<Ret, A> Hash for unsafe extern "C" fn(A) -> Retimpl<Ret, A, B> Hash for unsafe fn(A, B) -> Retimpl<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D, ...) -> Retimpl<T> Hash for [T; 17] where
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, ...) -> Retimpl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E) -> Retimpl<A, B, C, D, E> Hash for (A, B, C, D, E) where
A: Hash,
B: Hash,
C: Hash,
D: Hash,
E: Hash + ?Sized,impl<T> Hash for [T; 16] where
T: Hash,impl<T> Hash for [T; 31] where
T: Hash,impl<T> Hash for [T; 32] where
T: Hash,impl Hash for i16x32impl<Ret, A> Hash for extern "C" fn(A, ...) -> Retimpl<Idx> Hash for RangeTo<Idx> where
Idx: Hash,impl<T> Hash for [T; 20] where
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,impl<T> Hash for [T; 3] where
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, ...) -> Retimpl Hash for NonZeroI128impl<Ret, A, B> Hash for extern "C" fn(A, B) -> Retimpl<Ret, A, B, C> Hash for fn(A, B, C) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Hash for unsafe fn(A, B, C, D, E, F, G, H) -> Retimpl<Idx> Hash for Range<Idx> where
Idx: Hash,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) -> Retimpl<T> Hash for [T; 23] where
T: Hash,impl<T> Hash for [T; 22] where
T: Hash,impl<T> Hash for *const T where
T: ?Sized,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) -> Retimpl<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,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, ...) -> Retimpl Hash for i8x64impl Hash for i64x2impl Hash for i64impl<Ret, A, B, C, D, E, F, G, H, I> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret> Hash for extern "C" fn() -> Retimpl Hash for NoneErrorimpl<Ret> Hash for unsafe fn() -> Retimpl<T> Hash for *mut T where
T: ?Sized,impl<Ret, A, B, C, D, E, F> Hash for fn(A, B, C, D, E, F) -> Retimpl<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) -> Retimpl Hash for u32x2impl Hash for NonZeroI32impl<'a, T> Hash for &'a T where
T: Hash + ?Sized,impl<T> Hash for [T; 4] where
T: Hash,impl Hash for u32x16impl Hash for u16x32impl<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) -> Retimpl<A, B, C> Hash for (A, B, C) where
A: Hash,
B: Hash,
C: Hash + ?Sized,impl<Idx> Hash for RangeFrom<Idx> where
Idx: Hash,impl<T> Hash for [T] where
T: Hash,impl<Ret, A, B> Hash for fn(A, B) -> Retimpl Hash for isizeimpl<Ret, A, B, C, D, E, F, G, H, I, J> Hash for fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Hash for unsafe fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A> Hash for fn(A) -> Retimpl<T> Hash for [T; 30] where
T: Hash,impl<T> Hash for Reverse<T> where
T: Hash,impl Hash for NonZeroU8impl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G) -> Retimpl Hash for u8x64impl<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) -> Retimpl Hash for i16x8impl<A, B> Hash for (A, B) where
A: Hash,
B: Hash + ?Sized,impl<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl<T> Hash for [T; 26] where
T: Hash,impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C, ...) -> Retimpl Hash for u64impl<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,impl Hash for charimpl<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,impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C, ...) -> Retimpl<Y, R> Hash for GeneratorState<Y, R> where
R: Hash,
Y: Hash,impl Hash for i8x4impl Hash for NonZeroI64impl Hash for Orderingimpl<Ret, A, B, C, D, E, F, G> Hash for unsafe fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D> Hash for extern "C" fn(A, B, C, D) -> Retimpl<T> Hash for [T; 7] where
T: Hash,impl Hash for u16x2impl<Ret, A, B, C, D, E> Hash for unsafe fn(A, B, C, D, E) -> Retimpl Hash for TypeIdimpl<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<T> Hash for PhantomData<T> where
T: ?Sized,impl Hash for u8x4impl<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, ...) -> Retimpl<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,impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C) -> Retimpl<Ret, A, B> Hash for extern "C" fn(A, B, ...) -> Retimpl Hash for u64x2impl Hash for i128impl Hash for u32impl Hash for i16x4impl<Ret, A, B, C, D, E, F, G, H> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret> Hash for fn() -> Retimpl<T> Hash for [T; 14] where
T: Hash,impl Hash for strimpl Hash for NonZeroUsizeimpl<T> Hash for [T; 6] where
T: Hash,impl<T> Hash for [T; 13] where
T: Hash,impl Hash for Stringimpl<'a, B> Hash for Cow<'a, B> where
B: Hash + ToOwned + ?Sized,impl<T> Hash for Arc<T> where
T: Hash + ?Sized,impl<T> Hash for LinkedList<T> where
T: Hash,impl<T> Hash for Rc<T> where
T: Hash + ?Sized,impl<K, V> Hash for BTreeMap<K, V> where
K: Hash,
V: Hash,impl<T> Hash for Vec<T> where
T: Hash,impl<T> Hash for BTreeSet<T> where
T: Hash,impl<T> Hash for Box<T> where
T: Hash + ?Sized,impl<A> Hash for VecDeque<A> where
A: Hash,impl Hash for ThreadIdimpl Hash for CStringimpl Hash for CStrimpl Hash for OsStringimpl Hash for OsStrimpl Hash for FileTypeimpl Hash for ErrorKindimpl Hash for IpAddrimpl Hash for Ipv6MulticastScopeimpl Hash for Ipv4Addrimpl Hash for Ipv6Addrimpl Hash for SocketAddrimpl Hash for SocketAddrV4impl Hash for SocketAddrV6impl<'a> Hash for Prefix<'a>impl<'a> Hash for PrefixComponent<'a>impl<'a> Hash for Component<'a>impl Hash for PathBufimpl Hash for Pathimpl Hash for Instantimpl Hash for SystemTime