Protocol std::hash::Hasher

Hashing algorithms.

Hasher is a visitor that is accepted by a hashable type through the hash method. Each hasher is a disposable object that is used to hash a single value.

Example

use std::hash::hash_of_val;

// A bad hash, do not use
struct CountingHash {
    length: usize
}

impl CountingHash {
    fn new() -> CountingHash { CountingHash { length: 0 } }
    fn write(self: &mut CountingHash, val: &[u8]) { self.length += val.len() }
    fn finish(self: &mut CountingHash) -> u64 { self.length as u64 }
}

assert_eq!(hash_of_val::<&[u8], CountingHash>(""), 0);
assert_eq!(hash_of_val::<&[u8], CountingHash>("a"), 1);
assert_eq!(hash_of_val::<&[u8], CountingHash>("ab"), 2);
Run this example

Required methods

• fn new() -> Self

  source

  Create a new hasher.

• fn write(self: &mut Self, val: &[u8])

  source

  Write a byte slice into a hasher.

• fn finish(self: &mut Self) -> u64

  source

  Finalize the hashing and return the hash value.