Trait nom::lib::std::hash::Hash1.0.0[][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,
}

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

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());

Provided Methods

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());

Implementations on Foreign Types

impl Hash for CStr
[src]

impl Hash for SocketAddr
[src]

impl Hash for Ipv6Addr
[src]

impl Hash for CString
[src]

impl Hash for OsString
[src]

impl Hash for SocketAddrV6
[src]

impl Hash for Ipv4Addr
[src]

impl Hash for SocketAddrV4
[src]

impl Hash for FileType
[src]

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

impl Hash for SystemTime
[src]

impl Hash for OsStr
[src]

impl Hash for Ipv6MulticastScope
[src]

impl Hash for ThreadId
[src]

impl Hash for PathBuf
[src]

impl Hash for Instant
[src]

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

impl Hash for Path
[src]

impl Hash for ErrorKind
[src]

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

impl Hash for IpAddr
[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> Hash for unsafe fn(A, B) -> 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 u8x64
[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 i8x2
[src]

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

impl Hash for u128
[src]

impl<Ret, A, B, C> Hash for unsafe fn(A, B, C) -> 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> Hash for fn() -> 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<T> Hash for [T; 3] where
    T: Hash
[src]

impl Hash for NonZeroU64
[src]

impl Hash for i8x32
[src]

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

impl<T> Hash for [T; 22] where
    T: Hash
[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 unsafe extern "C" fn(A, B, C, D, E) -> Ret
[src]

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

impl Hash for NonZeroIsize
[src]

impl<T> Hash for [T; 13] where
    T: 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<T> Hash for [T; 20] where
    T: Hash
[src]

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

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

impl Hash for i8x64
[src]

impl Hash for i8x8
[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 Hash for i8x4
[src]

impl<T> Hash for [T; 31] where
    T: Hash
[src]

impl Hash for i128
[src]

impl<T> Hash for [T; 12] where
    T: 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, 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> 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, 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> Hash for fn(A, B, C, D) -> Ret
[src]

impl Hash for i16
[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, I> Hash for unsafe fn(A, B, C, D, E, F, G, H, I) -> Ret
[src]

impl<T> Hash for [T; 6] where
    T: Hash
[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 Hash for u64x2
[src]

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

impl Hash for NonZeroI128
[src]

impl<T> Hash for [T; 28] where
    T: Hash
[src]

impl Hash for i32x16
[src]

impl Hash for bool
[src]

impl Hash for i16x4
[src]

impl Hash for i16x16
[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<T> Hash for [T; 17] where
    T: Hash
[src]

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

impl Hash for NonZeroUsize
[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 u16x16
[src]

impl Hash for u16x2
[src]

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

impl<T> Hash for [T; 26] where
    T: Hash
[src]

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

impl<T> Hash for [T; 24] where
    T: Hash
[src]

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

impl Hash for u16
[src]

impl Hash for u8
[src]

impl Hash for NonZeroU128
[src]

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

impl<T> Hash for [T; 30] where
    T: Hash
[src]

impl Hash for i64x8
[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> Hash for extern "C" fn(A) -> 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> Hash for (A, B) where
    A: Hash,
    B: Hash + ?Sized
[src]

impl<T> Hash for [T; 23] where
    T: Hash
[src]

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

impl Hash for TypeId
[src]

impl Hash for i32x8
[src]

impl Hash for usize
[src]

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

impl Hash for u64
[src]

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

impl<A> Hash for (A,) where
    A: 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<T> Hash for [T; 29] where
    T: Hash
[src]

impl<T> Hash for NonZero<T> where
    T: Zeroable + Hash
[src]

impl Hash for Duration
[src]

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

impl<T> Hash for [T; 32] where
    T: Hash
[src]

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

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

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

impl Hash for str
[src]

impl Hash for NonZeroU8
[src]

impl Hash for u8x4
[src]

impl<T> Hash for [T; 2] where
    T: Hash
[src]

impl<T> Hash for [T; 1] where
    T: Hash
[src]

impl Hash for i8x16
[src]

impl Hash for NonZeroU16
[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<T> Hash for [T; 10] where
    T: Hash
[src]

impl Hash for i32
[src]

impl Hash for NonZeroI8
[src]

impl Hash for ()
[src]

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

impl<T> Hash for [T; 18] where
    T: Hash
[src]

impl Hash for NonZeroI32
[src]

impl Hash for NonZeroU32
[src]

impl Hash for u8x8
[src]

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

impl Hash for u32x4
[src]

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

impl<T> Hash for [T; 5] where
    T: Hash
[src]

impl<T> Hash for [T; 0] where
    T: Hash
[src]

impl<T> Hash for [T; 4] where
    T: Hash
[src]

impl Hash for i32x4
[src]

impl<T> Hash for [T; 9] where
    T: 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
    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, C, D, E> Hash for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret
[src]

impl Hash for u64x8
[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 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 fn(A, B, C, D, E, F, G) -> Ret
[src]

impl Hash for u32x8
[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<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 NonZeroI64
[src]

impl Hash for u8x2
[src]

impl Hash for u32x16
[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 i16x32
[src]

impl Hash for i8
[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 i32x2
[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 Hash for u64x4
[src]

impl Hash for i64
[src]

impl Hash for u32
[src]

impl Hash for u32x2
[src]

impl Hash for u8x16
[src]

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

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

impl<Ret, A, B, C> Hash for unsafe extern "C" fn(A, B, C) -> 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 Hash for i16x2
[src]

impl Hash for u8x32
[src]

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

impl<T> Hash for [T; 16] where
    T: Hash
[src]

impl<T> Hash for [T; 27] where
    T: Hash
[src]

impl<T> Hash for [T; 7] where
    T: Hash
[src]

impl<T> Hash for [T; 15] where
    T: Hash
[src]

impl Hash for NonZeroI16
[src]

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

impl Hash for u16x8
[src]

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

impl Hash for u16x32
[src]

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

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

impl<T> Hash for [T; 14] where
    T: Hash
[src]

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

impl<T> Hash for [T; 25] where
    T: Hash
[src]

impl<T> Hash for [T; 11] where
    T: Hash
[src]

impl<T> Hash for Wrapping<T> where
    T: 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<T> Hash for [T; 21] where
    T: Hash
[src]

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

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

impl<T> Hash for [T; 8] where
    T: Hash
[src]

impl Hash for i64x2
[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> Hash for extern "C" fn(A, B, C, D, E, F, G, ...) -> 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 Hash for i64x4
[src]

impl Hash for u16x4
[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<T> Hash for [T; 19] where
    T: Hash
[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, F, G, H> Hash for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret
[src]

impl Hash for i16x8
[src]

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

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

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

Implementors