1.0.0[][src]Trait std::hash::Hash

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

fn hash<H>(&self, state: &mut H) where
    H: Hasher

Feeds this value into the given Hasher.

Examples

use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};

let mut hasher = DefaultHasher::new();
7920.hash(&mut hasher);
println!("Hash is {:x}!", hasher.finish());
Run
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Provided methods

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher
1.3.0

Feeds a slice of this type into the given Hasher.

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());
Run
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Implementations on Foreign Types

impl<T> Hash for DebugFrameOffset<T> where
    T: Hash

impl Hash for DwAte

impl Hash for DwChildren

impl Hash for DwAccess

impl Hash for Range

impl<T> Hash for DebugTypesOffset<T> where
    T: Hash

impl<T> Hash for DebugMacroOffset<T> where
    T: Hash

impl Hash for DwMacro

impl Hash for DwEhPe

impl<T> Hash for RangeListsOffset<T> where
    T: Hash

impl Hash for DwUt

impl Hash for DwRle

impl Hash for Encoding

impl Hash for RunTimeEndian

impl<T> Hash for LocationListsOffset<T> where
    T: Hash

impl Hash for DwForm

impl Hash for LittleEndian

impl<R> Hash for LocationListEntry<R> where
    R: Reader + Hash

impl Hash for DwVirtuality

impl Hash for DwCc

impl<T> Hash for DebugInfoOffset<T> where
    T: Hash

impl Hash for DwDs

impl Hash for DwEnd

impl Hash for DwDsc

impl Hash for Register

impl Hash for LineEncoding

impl<T> Hash for EhFrameOffset<T> where
    T: Hash

impl Hash for DwLle

impl Hash for DwLnct

impl Hash for DwInl

impl Hash for DwOrd

impl Hash for DebugTypeSignature

impl Hash for DwLns

impl<T> Hash for UnitSectionOffset<T> where
    T: Hash

impl<'input, Endian> Hash for EndianSlice<'input, Endian> where
    Endian: Hash + Endianity, 

impl Hash for DwDefaulted

impl Hash for BigEndian

impl<R> Hash for Expression<R> where
    R: Reader + Hash

impl Hash for DwAddr

impl Hash for DwLne

impl Hash for Format

impl<T> Hash for UnitOffset<T> where
    T: Hash

impl<T> Hash for DebugAbbrevOffset<T> where
    T: Hash

impl Hash for SectionId

impl Hash for DwLang

impl Hash for DwId

impl Hash for DwAt

impl Hash for DwCfa

impl Hash for DwTag

impl Hash for DwIdx

impl<T> Hash for DebugMacinfoOffset<T> where
    T: Hash

impl Hash for DwVis

impl Hash for DwOp

impl Hash for BigEndian

impl Hash for RelocationTarget

impl Hash for Endianness

impl<E> Hash for U16<E> where
    E: Endian + Hash

impl Hash for BinaryFormat

impl Hash for SymbolSection

impl Hash for AddressSize

impl<E> Hash for I64<E> where
    E: Endian + Hash

impl<E> Hash for I32Bytes<E> where
    E: Endian + Hash

impl Hash for SectionIndex

impl<E> Hash for U32Bytes<E> where
    E: Endian + Hash

impl<E> Hash for U64Bytes<E> where
    E: Endian + Hash

impl<E> Hash for I64Bytes<E> where
    E: Endian + Hash

impl Hash for Architecture

impl Hash for LittleEndian

impl Hash for SymbolIndex

impl<E> Hash for U32<E> where
    E: Endian + Hash

impl<'data> Hash for CompressedData<'data>

impl<E> Hash for I16<E> where
    E: Endian + Hash

impl<E> Hash for U64<E> where
    E: Endian + Hash

impl<E> Hash for I32<E> where
    E: Endian + Hash

impl Hash for CompressionFormat

impl<E> Hash for I16Bytes<E> where
    E: Endian + Hash

impl<E> Hash for U16Bytes<E> where
    E: Endian + Hash

impl Hash for CompressionStrategy

impl Hash for TDEFLStatus

impl Hash for DataFormat

impl Hash for TINFLStatus

impl Hash for MZStatus

impl Hash for MZFlush

impl Hash for MZError

impl Hash for TDEFLFlush

impl Hash for CompressionLevel

impl Hash for StreamResult

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Implementors

impl Hash for std::cmp::Ordering[src]

impl Hash for Infallible[src]

impl Hash for ErrorKind[src]

impl Hash for IpAddr[src]

impl Hash for Ipv6MulticastScope[src]

impl Hash for SocketAddr[src]

impl Hash for std::sync::atomic::Ordering[src]

impl Hash for bool[src]

impl Hash for char[src]

impl Hash for i8[src]

impl Hash for i16[src]

impl Hash for i32[src]

impl Hash for i64[src]

impl Hash for i128[src]

impl Hash for isize[src]

impl Hash for ![src]

impl Hash for str[src]

impl Hash for u8[src]

impl Hash for u16[src]

impl Hash for u32[src]

impl Hash for u64[src]

impl Hash for u128[src]

impl Hash for ()[src]

impl Hash for usize[src]

impl Hash for TypeId[src]

impl Hash for CStr[src]

impl Hash for CString[src]

impl Hash for OsStr[src]

impl Hash for OsString[src]

impl Hash for Error[src]

impl Hash for FileType[src]

impl Hash for PhantomPinned[src]

impl Hash for Ipv4Addr[src]

impl Hash for Ipv6Addr[src]

impl Hash for SocketAddrV4[src]

impl Hash for SocketAddrV6[src]

impl Hash for NonZeroI8[src]

impl Hash for NonZeroI16[src]

impl Hash for NonZeroI32[src]

impl Hash for NonZeroI64[src]

impl Hash for NonZeroI128[src]

impl Hash for NonZeroIsize[src]

impl Hash for NonZeroU8[src]

impl Hash for NonZeroU16[src]

impl Hash for NonZeroU32[src]

impl Hash for NonZeroU64[src]

impl Hash for NonZeroU128[src]

impl Hash for NonZeroUsize[src]

impl Hash for RangeFull[src]

impl Hash for NoneError[src]

impl Hash for Path[src]

impl Hash for PathBuf[src]

impl Hash for String[src]

impl Hash for ThreadId[src]

impl Hash for Duration[src]

impl Hash for Instant[src]

impl Hash for SystemTime[src]

impl<'_> Hash for PrefixComponent<'_>[src]

impl<'_, B> Hash for Cow<'_, B> where
    B: Hash + ToOwned + ?Sized
[src]

impl<'_, T> Hash for &'_ T where
    T: Hash + ?Sized
[src]

impl<'_, T> Hash for &'_ mut T where
    T: Hash + ?Sized
[src]

impl<'a> Hash for Component<'a>[src]

impl<'a> Hash for Prefix<'a>[src]

impl<'a> Hash for Location<'a>[src]

impl<A> Hash for (A,) where
    A: Hash + ?Sized
[src]

impl<A> Hash for VecDeque<A> where
    A: Hash
[src]

impl<A, B> Hash for (A, B) where
    A: Hash,
    B: Hash + ?Sized
[src]

impl<A, B, C> Hash for (A, B, C) where
    A: Hash,
    B: Hash,
    C: Hash + ?Sized
[src]

impl<A, B, C, D> Hash for (A, B, C, D) where
    A: Hash,
    B: Hash,
    C: Hash,
    D: Hash + ?Sized
[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]

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]

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]

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]

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]

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]

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]

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]

impl<Idx> Hash for std::ops::Range<Idx> where
    Idx: Hash
[src]

impl<Idx> Hash for RangeFrom<Idx> where
    Idx: Hash
[src]

impl<Idx> Hash for RangeInclusive<Idx> where
    Idx: Hash
[src]

impl<Idx> Hash for RangeTo<Idx> where
    Idx: Hash
[src]

impl<Idx> Hash for RangeToInclusive<Idx> where
    Idx: Hash
[src]

impl<K, V> Hash for BTreeMap<K, V> where
    K: Hash,
    V: Hash
[src]

impl<P> Hash for Pin<P> where
    P: Deref,
    <P as Deref>::Target: Hash
[src]

impl<Ret> Hash for fn() -> Ret[src]

impl<Ret> Hash for extern "C" fn() -> Ret[src]

impl<Ret> Hash for unsafe fn() -> Ret[src]

impl<Ret> Hash for unsafe extern "C" fn() -> Ret[src]

impl<Ret, A> Hash for fn(A) -> Ret[src]

impl<Ret, A> Hash for extern "C" fn(A) -> Ret[src]

impl<Ret, A> Hash for extern "C" fn(A, ...) -> Ret[src]

impl<Ret, A> Hash for unsafe fn(A) -> Ret[src]

impl<Ret, A> Hash for unsafe extern "C" fn(A) -> Ret[src]

impl<Ret, A> Hash for unsafe extern "C" fn(A, ...) -> Ret[src]

impl<Ret, A, B> Hash for fn(A, B) -> Ret[src]

impl<Ret, A, B> Hash for extern "C" fn(A, B) -> Ret[src]

impl<Ret, A, B> Hash for extern "C" fn(A, B, ...) -> Ret[src]

impl<Ret, A, B> Hash for unsafe fn(A, B) -> Ret[src]

impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B) -> Ret[src]

impl<Ret, A, B> Hash for unsafe extern "C" fn(A, B, ...) -> Ret[src]

impl<Ret, A, B, C> Hash for fn(A, B, C) -> Ret[src]

impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C) -> Ret[src]

impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C, ...) -> Ret[src]

impl<Ret, A, B, C> Hash for unsafe fn(A, B, C) -> Ret[src]

impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C) -> Ret[src]

impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C, ...) -> Ret[src]

impl<Ret, A, B, C, D> Hash for fn(A, B, C, D) -> Ret[src]

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 extern "C" fn(A, B, C, D, ...) -> Ret[src]

impl<Ret, A, B, C, D> Hash for unsafe 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<Ret, A, B, C, D> Hash for unsafe extern "C" fn(A, B, C, D, ...) -> Ret[src]

impl<Ret, A, B, C, D, E> Hash for fn(A, B, C, D, E) -> Ret[src]

impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E) -> Ret[src]

impl<Ret, A, B, C, D, E> Hash for extern "C" fn(A, B, C, D, E, ...) -> Ret[src]

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> Hash for unsafe extern "C" fn(A, B, C, D, E) -> Ret[src]

impl<Ret, A, B, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Hash for fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Hash for extern "C" fn(A, B, C, D, E, F, ...) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Hash for unsafe fn(A, B, C, D, E, F) -> 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<Ret, A, B, C, D, E, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G> Hash for fn(A, B, C, D, E, F, G) -> 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<Ret, A, B, C, D, E, F, G> Hash for extern "C" fn(A, B, C, D, E, F, G, ...) -> 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<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> 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> Hash for fn(A, B, C, D, E, F, G, H) -> 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<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<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, 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> 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> 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> Hash for unsafe 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, 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, J> Hash for 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 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 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> Hash for 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> 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 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 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, 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 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 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 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<T> Hash for Bound<T> where
    T: Hash
[src]

impl<T> Hash for Option<T> where
    T: Hash
[src]

impl<T> Hash for Poll<T> where
    T: Hash
[src]

impl<T> Hash for *const T where
    T: ?Sized
[src]

impl<T> Hash for *mut T where
    T: ?Sized
[src]

impl<T> Hash for [T] where
    T: Hash
[src]

impl<T> Hash for Box<T> where
    T: Hash + ?Sized
[src]

impl<T> Hash for Reverse<T> where
    T: Hash
[src]

impl<T> Hash for BTreeSet<T> where
    T: Hash
[src]

impl<T> Hash for LinkedList<T> where
    T: Hash
[src]

impl<T> Hash for PhantomData<T> where
    T: ?Sized
[src]

impl<T> Hash for Discriminant<T>[src]

impl<T> Hash for ManuallyDrop<T> where
    T: Hash + ?Sized
[src]

impl<T> Hash for Wrapping<T> where
    T: Hash
[src]

impl<T> Hash for NonNull<T> where
    T: ?Sized
[src]

impl<T> Hash for Rc<T> where
    T: Hash + ?Sized
[src]

impl<T> Hash for Arc<T> where
    T: Hash + ?Sized
[src]

impl<T> Hash for Vec<T> where
    T: Hash
[src]

impl<T, E> Hash for Result<T, E> where
    E: Hash,
    T: Hash
[src]

impl<T, const N: usize> Hash for [T; N] where
    T: Hash
[src]

impl<Y, R> Hash for GeneratorState<Y, R> where
    R: Hash,
    Y: Hash
[src]

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