blob: 146cfa0d000b91f88353b07c4bc53001c56561f4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
#pragma once
#include "hash.hpp"
#include <cstdint>
#include <functional>
/**
* Combines the hash 'seed' with the hash of 'value'.
*
* @param seed A hash that will be mutated
* @param value A hashable value
*/
template <typename Value>
void hash_combine(std::size_t &seed, const Value &value) noexcept
{
constexpr uint32_t shift_left = 6;
constexpr uint32_t shift_right = 2;
seed ^= std::hash<Value>()(value) + GOLDEN_RATIO + (seed << shift_left) +
(seed >> shift_right);
}
|