solverforge_scoring/constraint/
shared.rs

1//! Shared utilities for typed constraints.
2
3use std::hash::{Hash, Hasher};
4
5/// Computes a hash of a value for tracking in join indices.
6///
7/// # Example
8///
9/// ```
10/// use solverforge_scoring::constraint::shared::compute_hash;
11///
12/// let hash1 = compute_hash(&42);
13/// let hash2 = compute_hash(&42);
14/// assert_eq!(hash1, hash2);
15///
16/// let hash3 = compute_hash(&43);
17/// assert_ne!(hash1, hash3);
18/// ```
19#[inline]
20pub fn compute_hash<T: Hash>(value: &T) -> u64 {
21    let mut hasher = std::collections::hash_map::DefaultHasher::new();
22    value.hash(&mut hasher);
23    hasher.finish()
24}