Struct Hash64 

pub struct Hash64 { /* private fields */ }

A streaming FNV-1a 64 digest: write values in a fixed order, read digest.

It is also a Hasher, so a type whose Hash implementation is yours can be folded through Hash::hash. The two paths agree on every primitive: this type overrides every integer writer, so u32 folds as four little-endian bytes either way. They differ on str, which the harness’s own str length-prefixes while Hash’s stable default writes the bytes and a 0xff; both are pinned, pick one and stay with it.

Implementations

impl Hash64

pub const fn new() -> Self

A digest of nothing: the FNV-1a offset basis.

pub const fn digest(&self) -> u64

What has been written so far.

Writing more changes it, so read it where the stream ends.

pub fn bytes(&mut self, bytes: &[u8])

Raw bytes, as given: no length prefix, no padding.

pub fn str(&mut self, value: &str)

A string as its length then its UTF-8 bytes.

pub fn u8(&mut self, value: u8)

One byte.

pub fn u16(&mut self, value: u16)

A 16-bit value, little-endian.

pub fn u32(&mut self, value: u32)

A 32-bit value, little-endian.

pub fn u64(&mut self, value: u64)

A 64-bit value, little-endian.

pub fn u128(&mut self, value: u128)

A 128-bit value, little-endian.

pub fn i8(&mut self, value: i8)

A signed value as its two’s-complement bits.

pub fn i16(&mut self, value: i16)

A signed value as its two’s-complement bits.

pub fn i32(&mut self, value: i32)

A signed value as its two’s-complement bits.

pub fn i64(&mut self, value: i64)

A signed value as its two’s-complement bits.

pub fn usize(&mut self, value: usize)

A length or index, folded as u64 so the width is not target-dependent.

pub fn isize(&mut self, value: isize)

A length or index, folded as i64 so the width is not target-dependent.

pub fn f32(&mut self, value: f32)

A float by its bits, so the fold is exact.

pub fn f64(&mut self, value: f64)

A float by its bits, so the fold is exact.

pub fn bool(&mut self, value: bool)

A bool as one byte, 0 or 1.

Trait Implementations

impl Clone for Hash64

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Hash64

impl Debug for Hash64

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Hash64

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Hash64

impl Hasher for Hash64

fn finish(&self) -> u64

Returns the hash value for the values written so far.

fn write(&mut self, bytes: &[u8])

Writes some data into this Hasher.

fn write_u8(&mut self, value: u8)

Writes a single u8 into this hasher.

fn write_u16(&mut self, value: u16)

Writes a single u16 into this hasher.

fn write_u32(&mut self, value: u32)

Writes a single u32 into this hasher.

fn write_u64(&mut self, value: u64)

Writes a single u64 into this hasher.

fn write_u128(&mut self, value: u128)

Writes a single u128 into this hasher.

fn write_usize(&mut self, value: usize)

Writes a single usize into this hasher.

fn write_i8(&mut self, value: i8)

Writes a single i8 into this hasher.

fn write_i16(&mut self, value: i16)

Writes a single i16 into this hasher.

fn write_i32(&mut self, value: i32)

Writes a single i32 into this hasher.

fn write_i64(&mut self, value: i64)

Writes a single i64 into this hasher.

fn write_i128(&mut self, value: i128)

Writes a single i128 into this hasher.

fn write_isize(&mut self, value: isize)

Writes a single isize into this hasher.

fn write_length_prefix(&mut self, len: usize)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a length prefix into this hasher, as part of being prefix-free.

fn write_str(&mut self, s: &str)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a single str into this hasher.

impl PartialEq for Hash64

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Hash64