state/
ident_hash.rs

1use std::hash::Hasher;
2
3// This is a _super_ stupid hash. It just uses its input as the hash value. This
4// hash is meant to be used _only_ for "prehashed" values. In particular, we use
5// this so that hashing a TypeId is essentially a noop. This is because TypeIds
6// are already unique integers.
7#[derive(Default)]
8pub struct IdentHash(u64);
9
10impl Hasher for IdentHash {
11    fn finish(&self) -> u64 {
12        self.0
13    }
14
15    fn write(&mut self, bytes: &[u8]) {
16        for byte in bytes {
17            self.write_u8(*byte);
18        }
19    }
20
21    fn write_u8(&mut self, i: u8) {
22        self.0 = (self.0 << 8) | (i as u64);
23    }
24
25    fn write_u64(&mut self, i: u64) {
26        self.0 = i;
27    }
28}
state/ident_hash.rs

state/
ident_hash.rs
