Trait std::hash::Hasher 1.0.0[−][src]
pub trait Hasher {
Show methods
pub fn finish(&self) -> u64;
pub fn write(&mut self, bytes: &[u8]);
pub fn write_u8(&mut self, i: u8) { ... }
pub fn write_u16(&mut self, i: u16) { ... }
pub fn write_u32(&mut self, i: u32) { ... }
pub fn write_u64(&mut self, i: u64) { ... }
pub fn write_u128(&mut self, i: u128) { ... }
pub fn write_usize(&mut self, i: usize) { ... }
pub fn write_i8(&mut self, i: i8) { ... }
pub fn write_i16(&mut self, i: i16) { ... }
pub fn write_i32(&mut self, i: i32) { ... }
pub fn write_i64(&mut self, i: i64) { ... }
pub fn write_i128(&mut self, i: i128) { ... }
pub fn write_isize(&mut self, i: isize) { ... }
}A trait for hashing an arbitrary stream of bytes.
Instances of Hasher usually represent state that is changed while hashing
data.
Hasher provides a fairly basic interface for retrieving the generated hash
(with finish), and writing integers as well as slices of bytes into an
instance (with write and write_u8 etc.). Most of the time, Hasher
instances are used in conjunction with the Hash trait.
This trait makes no assumptions about how the various write_* methods are
defined and implementations of Hash should not assume that they work one
way or another. You cannot assume, for example, that a write_u32 call is
equivalent to four calls of write_u8.
Examples
use std::collections::hash_map::DefaultHasher; use std::hash::Hasher; let mut hasher = DefaultHasher::new(); hasher.write_u32(1989); hasher.write_u8(11); hasher.write_u8(9); hasher.write(b"Huh?"); println!("Hash is {:x}!", hasher.finish());Run
Required methods
pub fn finish(&self) -> u64[src]
Returns the hash value for the values written so far.
Despite its name, the method does not reset the hasher’s internal
state. Additional writes will continue from the current value.
If you need to start a fresh hash value, you will have to create
a new hasher.
Examples
use std::collections::hash_map::DefaultHasher; use std::hash::Hasher; let mut hasher = DefaultHasher::new(); hasher.write(b"Cool!"); println!("Hash is {:x}!", hasher.finish());Run
pub fn write(&mut self, bytes: &[u8])[src]
Provided methods
pub fn write_u8(&mut self, i: u8)1.3.0[src]
Writes a single u8 into this hasher.
pub fn write_u16(&mut self, i: u16)1.3.0[src]
Writes a single u16 into this hasher.
pub fn write_u32(&mut self, i: u32)1.3.0[src]
Writes a single u32 into this hasher.
pub fn write_u64(&mut self, i: u64)1.3.0[src]
Writes a single u64 into this hasher.
pub fn write_u128(&mut self, i: u128)1.26.0[src]
Writes a single u128 into this hasher.
pub fn write_usize(&mut self, i: usize)1.3.0[src]
Writes a single usize into this hasher.
pub fn write_i8(&mut self, i: i8)1.3.0[src]
Writes a single i8 into this hasher.
pub fn write_i16(&mut self, i: i16)1.3.0[src]
Writes a single i16 into this hasher.
pub fn write_i32(&mut self, i: i32)1.3.0[src]
Writes a single i32 into this hasher.
pub fn write_i64(&mut self, i: i64)1.3.0[src]
Writes a single i64 into this hasher.
pub fn write_i128(&mut self, i: i128)1.26.0[src]
Writes a single i128 into this hasher.
pub fn write_isize(&mut self, i: isize)1.3.0[src]
Writes a single isize into this hasher.
Implementors
impl Hasher for DefaultHasher1.13.0[src]
impl Hasher for DefaultHasher1.13.0[src]impl<'_, H> Hasher for &'_ mut H where
H: Hasher + ?Sized, 1.22.0[src]
impl<'_, H> Hasher for &'_ mut H where
H: Hasher + ?Sized, 1.22.0[src]pub fn finish(&self) -> u64[src]
pub fn write(&mut self, bytes: &[u8])[src]
pub fn write_u8(&mut self, i: u8)[src]
pub fn write_u16(&mut self, i: u16)[src]
pub fn write_u32(&mut self, i: u32)[src]
pub fn write_u64(&mut self, i: u64)[src]
pub fn write_u128(&mut self, i: u128)[src]
pub fn write_usize(&mut self, i: usize)[src]
pub fn write_i8(&mut self, i: i8)[src]
pub fn write_i16(&mut self, i: i16)[src]
pub fn write_i32(&mut self, i: i32)[src]
pub fn write_i64(&mut self, i: i64)[src]
pub fn write_i128(&mut self, i: i128)[src]
pub fn write_isize(&mut self, i: isize)[src]
impl<T, A> Hasher for Box<T, A> where
T: Hasher + ?Sized,
A: Allocator, 1.22.0[src]
impl<T, A> Hasher for Box<T, A> where
T: Hasher + ?Sized,
A: Allocator, 1.22.0[src]