Trait kvarn::prelude::compact_str::core::hash::Hash

1.0.0 · source ·
pub trait Hash {
    // Required method
    fn hash<H>(&self, state: &mut H)
       where H: Hasher;

    // Provided method
    fn hash_slice<H>(data: &[Self], state: &mut H)
       where H: Hasher,
             Self: Sized { ... }
}
Available on non-crate feature miri-test-libstd only.
Expand description

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)].

Prefix collisions

Implementations of hash should ensure that the data they pass to the Hasher are prefix-free. That is, values which are not equal should cause two different sequences of values to be written, and neither of the two sequences should be a prefix of the other.

For example, the standard implementation of Hash for &str passes an extra 0xFF byte to the Hasher so that the values ("ab", "c") and ("a", "bc") hash differently.

Portability

Due to differences in endianness and type sizes, data fed by Hash to a Hasher should not be considered portable across platforms. Additionally the data passed by most standard library types should not be considered stable between compiler versions.

This means tests shouldn’t probe hard-coded hash values or data fed to a Hasher and instead should check consistency with Eq.

Serialization formats intended to be portable between platforms or compiler versions should either avoid encoding hashes or only rely on Hash and Hasher implementations that provide additional guarantees.

Required Methods§

source

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());

Provided Methods§

1.3.0 · source

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

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());

Implementors§

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impl Hash for CachePreferenceError

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impl Hash for ClientCachePreference

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impl Hash for CompressPreference

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impl Hash for ServerCachePreference

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impl Hash for UriKey

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impl Hash for kvarn::prelude::io::ErrorKind

1.7.0 · source§

impl Hash for kvarn::prelude::net::IpAddr

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impl Hash for Ipv6MulticastScope

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impl Hash for SocketAddr

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impl Hash for kvarn::prelude::compact_str::core::cmp::Ordering

1.44.0 · source§

impl Hash for Infallible

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impl Hash for Which

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impl Hash for kvarn::prelude::compact_str::core::sync::atomic::Ordering

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impl Hash for webpki::subject_name::ip_address::IpAddr

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impl Hash for log::Level

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impl Hash for log::LevelFilter

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impl Hash for Sign

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impl Hash for Direction

const: unstable · source§

impl Hash for bool

const: unstable · source§

impl Hash for char

const: unstable · source§

impl Hash for i8

const: unstable · source§

impl Hash for i16

const: unstable · source§

impl Hash for i32

const: unstable · source§

impl Hash for i64

const: unstable · source§

impl Hash for i128

const: unstable · source§

impl Hash for isize

1.29.0 (const: unstable) · source§

impl Hash for !

const: unstable · source§

impl Hash for str

const: unstable · source§

impl Hash for u8

const: unstable · source§

impl Hash for u16

const: unstable · source§

impl Hash for u32

const: unstable · source§

impl Hash for u64

const: unstable · source§

impl Hash for u128

const: unstable · source§

impl Hash for ()

const: unstable · source§

impl Hash for usize

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impl Hash for PathQuery

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impl Hash for Bytes

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impl Hash for BytesMut

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impl Hash for OffsetDateTime

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impl Hash for kvarn::prelude::fmt::Error

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impl Hash for HeaderName

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impl Hash for HeaderValue

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impl Hash for Mime

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impl Hash for Ipv4Addr

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impl Hash for Ipv6Addr

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impl Hash for SocketAddrV4

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impl Hash for SocketAddrV6

1.8.0 · source§

impl Hash for kvarn::prelude::Instant

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impl Hash for Method

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impl Hash for Path

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impl Hash for PathBuf

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impl Hash for StatusCode

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impl Hash for Version

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impl Hash for Authority

Case-insensitive hashing

Examples


let a: Authority = "HELLO.com".parse().unwrap();
let b: Authority = "hello.coM".parse().unwrap();

let mut s = DefaultHasher::new();
a.hash(&mut s);
let a = s.finish();

let mut s = DefaultHasher::new();
b.hash(&mut s);
let b = s.finish();

assert_eq!(a, b);
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impl Hash for PathAndQuery

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impl Hash for Scheme

Case-insensitive hashing

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impl Hash for Uri

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impl Hash for CompactString

1.28.0 · source§

impl Hash for Layout

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impl Hash for TypeId

1.64.0 · source§

impl Hash for CStr

1.33.0 · source§

impl Hash for PhantomPinned

1.34.0 · source§

impl Hash for NonZeroI8

1.34.0 · source§

impl Hash for NonZeroI16

1.34.0 · source§

impl Hash for NonZeroI32

1.34.0 · source§

impl Hash for NonZeroI64

1.34.0 · source§

impl Hash for NonZeroI128

1.34.0 · source§

impl Hash for NonZeroIsize

1.28.0 · source§

impl Hash for NonZeroU8

1.28.0 · source§

impl Hash for NonZeroU16

1.28.0 · source§

impl Hash for NonZeroU32

1.28.0 · source§

impl Hash for NonZeroU64

1.28.0 · source§

impl Hash for NonZeroU128

1.28.0 · source§

impl Hash for NonZeroUsize

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impl Hash for RangeFull

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impl Hash for Alignment

1.3.0 · source§

impl Hash for kvarn::prelude::compact_str::core::time::Duration

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impl Hash for DnsName

1.64.0 · source§

impl Hash for CString

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impl Hash for String

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impl Hash for OsStr

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impl Hash for OsString

1.1.0 · source§

impl Hash for FileType

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impl Hash for std::os::unix::ucred::UCred

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impl Hash for PrefixComponent<'_>

1.19.0 · source§

impl Hash for ThreadId

1.8.0 · source§

impl Hash for SystemTime

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impl Hash for FixedBitSet

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impl Hash for StreamId

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impl Hash for BigInt

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impl Hash for BigUint

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impl Hash for petgraph::visit::dfsvisit::Time

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impl Hash for Identifier

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impl Hash for Field

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impl Hash for tracing_core::metadata::Level

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impl Hash for tracing_core::metadata::LevelFilter

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impl Hash for Id

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impl Hash for Span

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impl Hash for ATerm

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impl Hash for B0

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impl Hash for B1

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impl Hash for Z0

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impl Hash for Equal

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impl Hash for Greater

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impl Hash for Less

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impl Hash for UTerm

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impl Hash for uuid::error::Error

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impl Hash for Braced

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impl Hash for Hyphenated

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impl Hash for Simple

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impl Hash for Urn

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impl Hash for Uuid

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impl Hash for Timestamp

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impl Hash for ASN1Time

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impl Hash for AccessKind

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impl Hash for AccessMode

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impl Hash for AnyDelimiterCodec

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impl Hash for BigEndian

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impl Hash for BytesCodec

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impl Hash for Certificate

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impl Hash for ComponentRange

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impl Hash for CompressionLevel

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impl Hash for CompressionStrategy

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impl Hash for Config

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impl Hash for CreateKind

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impl Hash for DataChange

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impl Hash for DataFormat

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impl Hash for Date

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impl Hash for Dl_info

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impl Hash for Duration

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impl Hash for Elf32_Chdr

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impl Hash for Elf32_Ehdr

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impl Hash for Elf32_Phdr

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impl Hash for Elf32_Shdr

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impl Hash for Elf32_Sym

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impl Hash for Elf64_Chdr

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impl Hash for Elf64_Ehdr

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impl Hash for Elf64_Phdr

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impl Hash for Elf64_Shdr

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impl Hash for Elf64_Sym

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impl Hash for ErrorKind

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impl Hash for Event

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impl Hash for EventKind

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impl Hash for EventMask

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impl Hash for FileTime

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impl Hash for Flag

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impl Hash for Flags

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impl Hash for FsyncFlags

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impl Hash for Handle

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impl Hash for Instant

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impl Hash for Instant

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impl Hash for LinesCodec

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impl Hash for LiteralPredictionModeNibble

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impl Hash for LittleEndian

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impl Hash for MZError

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impl Hash for MZFlush

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impl Hash for MZStatus

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impl Hash for MetadataKind

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impl Hash for ModifyKind

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impl Hash for Month

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impl Hash for Null

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impl Hash for PollNext

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impl Hash for PrimitiveDateTime

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impl Hash for RecursiveMode

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impl Hash for RemoveKind

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impl Hash for RenameMode

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impl Hash for ServerName

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impl Hash for StreamResult

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impl Hash for TDEFLFlush

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impl Hash for TDEFLStatus

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impl Hash for TINFLStatus

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impl Hash for Time

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impl Hash for TimeoutFlags

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impl Hash for Token

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impl Hash for UCred

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impl Hash for UtcOffset

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impl Hash for WatchDescriptor

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impl Hash for WatchMask

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impl Hash for WatcherKind

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impl Hash for Weekday

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impl Hash for __c_anonymous_ifru_map

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impl Hash for __c_anonymous_ptrace_syscall_info_data

Available on crate feature extra_traits and libc_union only.
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impl Hash for __c_anonymous_ptrace_syscall_info_entry

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impl Hash for __c_anonymous_ptrace_syscall_info_exit

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impl Hash for __c_anonymous_ptrace_syscall_info_seccomp

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impl Hash for __c_anonymous_sockaddr_can_j1939

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impl Hash for __c_anonymous_sockaddr_can_tp

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impl Hash for __exit_status

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impl Hash for __timeval

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impl Hash for _libc_fpstate

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impl Hash for _libc_fpxreg

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impl Hash for _libc_xmmreg

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impl Hash for addrinfo

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impl Hash for af_alg_iv

Available on crate feature extra_traits only.
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impl Hash for aiocb

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impl Hash for arpd_request

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impl Hash for arphdr

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impl Hash for arpreq

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impl Hash for arpreq_old

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impl Hash for can_filter

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impl Hash for clone_args

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impl Hash for cmsghdr

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impl Hash for cpu_set_t

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impl Hash for dirent

Available on crate feature extra_traits only.
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impl Hash for dirent64

Available on crate feature extra_traits only.
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impl Hash for dl_phdr_info

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impl Hash for dqblk

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impl Hash for epoll_event

Available on crate feature extra_traits only.
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impl Hash for fanotify_event_metadata

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impl Hash for fanotify_response

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impl Hash for fd_set

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impl Hash for ff_condition_effect

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impl Hash for ff_constant_effect

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impl Hash for ff_effect

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impl Hash for ff_envelope

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impl Hash for ff_periodic_effect

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impl Hash for ff_ramp_effect

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impl Hash for ff_replay

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impl Hash for ff_rumble_effect

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impl Hash for ff_trigger

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impl Hash for file_clone_range

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impl Hash for flock

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impl Hash for flock64

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impl Hash for fsid_t

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impl Hash for genlmsghdr

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impl Hash for glob64_t

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impl Hash for glob_t

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impl Hash for group

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impl Hash for hostent

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impl Hash for if_nameindex

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impl Hash for ifaddrs

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impl Hash for in6_addr

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impl Hash for in6_ifreq

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impl Hash for in6_pktinfo

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impl Hash for in6_rtmsg

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impl Hash for in_addr

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impl Hash for in_pktinfo

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impl Hash for inotify_event

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impl Hash for input_absinfo

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impl Hash for input_event

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impl Hash for input_id

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impl Hash for input_keymap_entry

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impl Hash for input_mask

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impl Hash for iovec

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impl Hash for ip_mreq

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impl Hash for ip_mreq_source

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impl Hash for ip_mreqn

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impl Hash for ipc_perm

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impl Hash for ipv6_mreq

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impl Hash for itimerspec

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impl Hash for itimerval

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impl Hash for j1939_filter

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impl Hash for lconv

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impl Hash for linger

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impl Hash for mallinfo

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impl Hash for mallinfo2

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impl Hash for mcontext_t

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impl Hash for mmsghdr

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impl Hash for mntent

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impl Hash for mq_attr

Available on crate feature extra_traits only.
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impl Hash for msghdr

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impl Hash for msginfo

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impl Hash for msqid_ds

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impl Hash for nl_mmap_hdr

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impl Hash for nl_mmap_req

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impl Hash for nl_pktinfo

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impl Hash for nlattr

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impl Hash for nlmsgerr

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impl Hash for nlmsghdr

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impl Hash for ntptimeval

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impl Hash for open_how

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impl Hash for option

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impl Hash for packet_mreq

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impl Hash for passwd

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impl Hash for pollfd

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impl Hash for posix_spawn_file_actions_t

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impl Hash for posix_spawnattr_t

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impl Hash for protoent

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impl Hash for pthread_attr_t

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impl Hash for pthread_cond_t

Available on crate feature extra_traits only.
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impl Hash for pthread_condattr_t

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impl Hash for pthread_mutex_t

Available on crate feature extra_traits only.
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impl Hash for pthread_mutexattr_t

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impl Hash for pthread_rwlock_t

Available on crate feature extra_traits only.
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impl Hash for pthread_rwlockattr_t

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impl Hash for ptrace_peeksiginfo_args

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impl Hash for ptrace_rseq_configuration

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impl Hash for ptrace_syscall_info

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impl Hash for regex_t

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impl Hash for regmatch_t

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impl Hash for rlimit

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impl Hash for rlimit64

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impl Hash for rtentry

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impl Hash for rusage

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impl Hash for sched_param

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impl Hash for seccomp_data

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impl Hash for seccomp_notif_sizes

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impl Hash for sem_t

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impl Hash for sembuf

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impl Hash for semid_ds

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impl Hash for seminfo

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impl Hash for servent

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impl Hash for shmid_ds

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impl Hash for sigaction

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impl Hash for sigevent

Available on crate feature extra_traits only.
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impl Hash for siginfo_t

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impl Hash for signalfd_siginfo

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impl Hash for sigset_t

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impl Hash for sigval

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impl Hash for sock_extended_err

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impl Hash for sock_filter

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impl Hash for sock_fprog

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impl Hash for sockaddr

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impl Hash for sockaddr_alg

Available on crate feature extra_traits only.
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impl Hash for sockaddr_in

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impl Hash for sockaddr_in6

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impl Hash for sockaddr_ll

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impl Hash for sockaddr_nl

Available on crate feature extra_traits only.
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impl Hash for sockaddr_storage

Available on crate feature extra_traits only.
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impl Hash for sockaddr_un

Available on crate feature extra_traits only.
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impl Hash for sockaddr_vm

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impl Hash for spwd

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impl Hash for stack_t

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impl Hash for stat

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impl Hash for stat64

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impl Hash for statfs

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impl Hash for statfs64

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impl Hash for statvfs

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impl Hash for statvfs64

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impl Hash for statx

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impl Hash for statx_timestamp

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impl Hash for sysinfo

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impl Hash for termios

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impl Hash for termios2

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impl Hash for timespec

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impl Hash for timeval

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impl Hash for timex

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impl Hash for tm

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impl Hash for tms

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impl Hash for ucontext_t

Available on crate feature extra_traits only.
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impl Hash for ucred

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impl Hash for uinput_abs_setup

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impl Hash for uinput_ff_erase

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impl Hash for uinput_ff_upload

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impl Hash for uinput_setup

Available on crate feature extra_traits only.
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impl Hash for uinput_user_dev

Available on crate feature extra_traits only.
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impl Hash for user

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impl Hash for user_fpregs_struct

Available on crate feature extra_traits only.
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impl Hash for user_regs_struct

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impl Hash for utimbuf

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impl Hash for utmpx

Available on crate feature extra_traits only.
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impl Hash for utsname

Available on crate feature extra_traits only.
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impl Hash for winsize

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impl<'a> Hash for Component<'a>

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impl<'a> Hash for Prefix<'a>

1.10.0 · source§

impl<'a> Hash for Location<'a>

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impl<'a> Hash for Metadata<'a>

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impl<'a> Hash for MetadataBuilder<'a>

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impl<'a> Hash for Name<'a>

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impl<'a> Hash for Oid<'a>

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impl<'b, T> Hash for Ptr<'b, T>

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impl<A> Hash for SmallVec<A>where A: Array, <A as Array>::Item: Hash,

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

1.55.0 · source§

impl<B, C> Hash for ControlFlow<B, C>where B: Hash, C: Hash,

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impl<Dyn> Hash for DynMetadata<Dyn>where Dyn: ?Sized,

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impl<H> Hash for HeaderWithLength<H>where H: Hash,

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impl<H, T> Hash for HeaderSlice<H, T>where H: Hash, T: Hash + ?Sized,

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impl<H, T> Hash for ThinArc<H, T>where H: Hash, T: Hash,

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impl<Idx> Hash for Range<Idx>where Idx: Hash,

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impl<Idx> Hash for RangeFrom<Idx>where Idx: Hash,

1.26.0 · source§

impl<Idx> Hash for RangeInclusive<Idx>where Idx: Hash,

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impl<Idx> Hash for RangeTo<Idx>where Idx: Hash,

1.26.0 · source§

impl<Idx> Hash for RangeToInclusive<Idx>where Idx: Hash,

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impl<Ix> Hash for petgraph::adj::EdgeIndex<Ix>where Ix: Hash + IndexType,

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impl<Ix> Hash for petgraph::graph_impl::EdgeIndex<Ix>where Ix: Hash,

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impl<Ix> Hash for NodeIndex<Ix>where Ix: Hash,

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impl<K, V, A> Hash for BTreeMap<K, V, A>where K: Hash, V: Hash, A: Allocator + Clone,

1.41.0 · source§

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

1.4.0 · source§

impl<Ret, T> Hash for fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

1.4.0 · source§

impl<Ret, T> Hash for extern "C" fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

1.4.0 · source§

impl<Ret, T> Hash for extern "C" fn (T₁, T₂, …, Tₙ, ...) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

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impl<Ret, T> Hash for extern "C-unwind" fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

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impl<Ret, T> Hash for extern "C-unwind" fn (T₁, T₂, …, Tₙ, ...) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

1.4.0 · source§

impl<Ret, T> Hash for unsafe fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

1.4.0 · source§

impl<Ret, T> Hash for unsafe extern "C" fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

1.4.0 · source§

impl<Ret, T> Hash for unsafe extern "C" fn (T₁, T₂, …, Tₙ, ...) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

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impl<Ret, T> Hash for unsafe extern "C-unwind" fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

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impl<Ret, T> Hash for unsafe extern "C-unwind" fn (T₁, T₂, …, Tₙ, ...) -> Ret

This trait is implemented for function pointers with up to twelve arguments.

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impl<S> Hash for Ascii<S>where S: AsRef<str>,

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impl<S> Hash for UniCase<S>where S: AsRef<str>,

1.17.0 · source§

impl<T> Hash for Bound<T>where T: Hash,

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impl<T> Hash for Option<T>where T: Hash,

1.36.0 · source§

impl<T> Hash for Poll<T>where T: Hash,

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impl<T> Hash for *const Twhere T: ?Sized,

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impl<T> Hash for *mut Twhere T: ?Sized,

const: unstable · source§

impl<T> Hash for &Twhere T: Hash + ?Sized,

const: unstable · source§

impl<T> Hash for &mut Twhere T: Hash + ?Sized,

const: unstable · source§

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

const: unstable · source§

impl<T> Hash for (T₁, T₂, …, Tₙ)where T: Hash + ?Sized,

This trait is implemented for tuples up to twelve items long.

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impl<T> Hash for kvarn::prelude::Arc<T>where T: Hash + ?Sized,

1.19.0 · source§

impl<T> Hash for Reverse<T>where T: Hash,

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impl<T> Hash for PhantomData<T>where T: ?Sized,

1.21.0 · source§

impl<T> Hash for Discriminant<T>

1.20.0 · source§

impl<T> Hash for ManuallyDrop<T>where T: Hash + ?Sized,

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impl<T> Hash for Saturating<T>where T: Hash,

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impl<T> Hash for Wrapping<T>where T: Hash,

1.25.0 · source§

impl<T> Hash for NonNull<T>where T: ?Sized,

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impl<T> Hash for LinkedList<T>where T: Hash,

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impl<T> Hash for Rc<T>where T: Hash + ?Sized,

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impl<T> Hash for AllowStdIo<T>where T: Hash,

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impl<T> Hash for Arc<T>where T: Hash + ?Sized,

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impl<T> Hash for CachePadded<T>where T: Hash,

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impl<T, A> Hash for Box<T, A>where T: Hash + ?Sized, A: Allocator,

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impl<T, A> Hash for BTreeSet<T, A>where T: Hash, A: Allocator + Clone,

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impl<T, A> Hash for VecDeque<T, A>where T: Hash, A: Allocator,

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impl<T, A> Hash for Vec<T, A>where T: Hash, A: Allocator,

The hash of a vector is the same as that of the corresponding slice, as required by the core::borrow::Borrow implementation.

#![feature(build_hasher_simple_hash_one)]
use std::hash::BuildHasher;

let b = std::collections::hash_map::RandomState::new();
let v: Vec<u8> = vec![0xa8, 0x3c, 0x09];
let s: &[u8] = &[0xa8, 0x3c, 0x09];
assert_eq!(b.hash_one(v), b.hash_one(s));
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impl<T, E> Hash for Result<T, E>where T: Hash, E: Hash,

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impl<T, N> Hash for GenericArray<T, N>where T: Hash, N: ArrayLength<T>,

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impl<T, const LANES: usize> Hash for Simd<T, LANES>where LaneCount<LANES>: SupportedLaneCount, T: SimdElement + Hash,

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

The hash of an array is the same as that of the corresponding slice, as required by the Borrow implementation.

#![feature(build_hasher_simple_hash_one)]
use std::hash::BuildHasher;

let b = std::collections::hash_map::RandomState::new();
let a: [u8; 3] = [0xa8, 0x3c, 0x09];
let s: &[u8] = &[0xa8, 0x3c, 0x09];
assert_eq!(b.hash_one(a), b.hash_one(s));
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impl<T, const N: usize> Hash for TagNonNull<T, N>

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impl<T, const N: usize> Hash for TagPtr<T, N>

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impl<U> Hash for NInt<U>where U: Hash + Unsigned + NonZero,

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impl<U> Hash for PInt<U>where U: Hash + Unsigned + NonZero,

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impl<U, B> Hash for UInt<U, B>where U: Hash, B: Hash,

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impl<V, A> Hash for TArr<V, A>where V: Hash, A: Hash,

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impl<V: Hash> Hash for CacheOut<V>

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impl<Y, R> Hash for GeneratorState<Y, R>where Y: Hash, R: Hash,