1.0.0[][src]Trait cron_clock::lib::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,
}

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

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());
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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());
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Implementations on Foreign Types

impl Hash for SystemTime[src]

impl Hash for SocketAddrV4[src]

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

impl Hash for OsString[src]

impl Hash for Ipv6Addr[src]

impl Hash for Ipv6MulticastScope[src]

impl Hash for Ipv4Addr[src]

impl Hash for Instant[src]

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

impl Hash for SocketAddr[src]

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

impl Hash for CString[src]

impl Hash for PathBuf[src]

impl Hash for CStr[src]

impl Hash for IpAddr[src]

impl Hash for Path[src]

impl Hash for ThreadId[src]

impl Hash for ErrorKind[src]

impl Hash for OsStr[src]

impl Hash for SocketAddrV6[src]

impl Hash for FileType[src]

impl Hash for usize[src]

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

impl Hash for NonZeroI8[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, 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<T> Hash for PhantomData<T> where
    T: ?Sized
[src]

impl Hash for isize[src]

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

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

impl Hash for NonZeroU128[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> 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<'_, T> Hash for &'_ T where
    T: Hash + ?Sized
[src]

impl<Ret, A, B> Hash for unsafe fn(A, B) -> 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 Hash for NonZeroU32[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<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 Hash for Ordering[src]

impl Hash for NonZeroI128[src]

impl<T> Hash for NonNull<T> where
    T: ?Sized
[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> Hash for extern "C" fn(A, B) -> Ret[src]

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

impl Hash for NonZeroU8[src]

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

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

impl Hash for TypeId[src]

impl<'_, T> Hash for &'_ mut T where
    T: Hash + ?Sized
[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> Hash for unsafe fn() -> Ret[src]

impl<Ret, A, B> Hash for extern "C" fn(A, B, ...) -> 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, F> Hash for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> 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 Hash for u64[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> Hash for unsafe extern "C" fn(A, B, ...) -> Ret[src]

impl Hash for u8[src]

impl<Ret> Hash for fn() -> 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> Hash for unsafe extern "C" fn(A, B, C, D, E, F) -> 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 Hash for NonZeroI16[src]

impl Hash for u128[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> Hash for extern "C" fn(A, B, C, ...) -> 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> Hash for extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Ret[src]

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

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

impl Hash for i64[src]

impl<Ret, A, B, C> Hash for extern "C" fn(A, B, C) -> 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 Hash for u32[src]

impl<A, B> Hash for (A, B) where
    A: Hash,
    B: Hash + ?Sized
[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 Hash for i8[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> 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> Hash for extern "C" fn(A, B, C, D, E, F, G) -> Ret[src]

impl Hash for NonZeroI32[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> Hash for extern "C" fn(A, B, C, D, E, F, ...) -> Ret[src]

impl Hash for bool[src]

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

impl Hash for char[src]

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

impl<const N: usize, T> Hash for [T; N] where
    T: Hash,
    [T; N]: LengthAtMost32
[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]

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

impl Hash for u16[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, 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, K> Hash for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret[src]

impl<A, B, C> Hash for (A, B, C) where
    A: Hash,
    B: Hash,
    C: 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<P> Hash for Pin<P> where
    P: Deref,
    <P as Deref>::Target: Hash
[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> Hash for fn(A, B) -> Ret[src]

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

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

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

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

impl Hash for str[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> Hash for extern "C" fn(A, B, C, D, E, F, G, H) -> 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
    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<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 i32[src]

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

impl Hash for i16[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> Hash for (A,) where
    A: Hash + ?Sized
[src]

impl Hash for NonZeroU16[src]

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

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

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

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

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

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

impl Hash for NonZeroI64[src]

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

impl Hash for i128[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, 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 unsafe fn(A, B, C, D, E) -> Ret[src]

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

impl Hash for ![src]

impl Hash for ()[src]

impl Hash for PhantomPinned[src]

impl Hash for NonZeroU64[src]

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

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

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

impl Hash for Timespec[src]

impl Hash for Tm[src]

impl Hash for Encoding

impl Hash for DwDefaulted

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

impl Hash for LittleEndian

impl Hash for BigEndian

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

impl Hash for DwLang

impl Hash for DwLle

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

impl Hash for DwIdx

impl Hash for SectionId

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

impl Hash for DwAddr

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

impl Hash for DwDsc

impl Hash for DwDs

impl Hash for Format

impl Hash for DwForm

impl Hash for DwCfa

impl Hash for DwVis

impl Hash for RunTimeEndian

impl Hash for DwEhPe

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

impl Hash for DwChildren

impl Hash for DwMacro

impl Hash for DwOrd

impl Hash for Range

impl Hash for DwId

impl Hash for DwVirtuality

impl Hash for DwLne

impl Hash for DwAccess

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

impl Hash for DwTag

impl Hash for DwCc

impl Hash for DebugTypeSignature

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

impl Hash for DwOp

impl Hash for DwLnct

impl Hash for LineEncoding

impl Hash for DwLns

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

impl Hash for DwAte

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

impl Hash for DwUt

impl Hash for DwAt

impl Hash for DwInl

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

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

impl Hash for DwRle

impl Hash for Register

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

impl Hash for DwEnd

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

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

impl Hash for RelocationTarget

impl Hash for CompressionFormat

impl Hash for BigEndian

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

impl Hash for Endianness

impl Hash for AddressSize

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

impl Hash for SymbolSection

impl Hash for BinaryFormat

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

impl Hash for Architecture

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

impl Hash for SymbolIndex

impl Hash for SectionIndex

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

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

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

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

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

impl Hash for LittleEndian

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Implementors

impl Hash for Weekday[src]

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

impl Hash for Infallible[src]

impl Hash for Error[src]

impl Hash for RangeFull[src]

impl Hash for NoneError[src]

impl Hash for String[src]

impl Hash for cron_clock::Duration[src]

impl Hash for FixedOffset[src]

impl Hash for NaiveDate[src]

impl Hash for NaiveDateTime[src]

NaiveDateTime can be used as a key to the hash maps (in principle).

Practically this also takes account of fractional seconds, so it is not recommended. (For the obvious reason this also distinguishes leap seconds from non-leap seconds.)

impl Hash for NaiveTime[src]

NaiveTime can be used as a key to the hash maps (in principle).

Practically this also takes account of fractional seconds, so it is not recommended. (For the obvious reason this also distinguishes leap seconds from non-leap seconds.)

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

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

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

impl<E> Hash for cron_clock::ErrorKind<E> where
    E: Hash
[src]

impl<Idx> Hash for cron_clock::lib::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<T> Hash for LocalResult<T> where
    T: Hash
[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 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 Discriminant<T>[src]

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

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

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

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

impl<Tz> Hash for Date<Tz> where
    Tz: TimeZone
[src]

impl<Tz> Hash for DateTime<Tz> where
    Tz: TimeZone
[src]

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

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