Visual Computing Library
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hash.h
1/*****************************************************************************
2 * VCLib *
3 * Visual Computing Library *
4 * *
5 * Copyright(C) 2021-2025 *
6 * Visual Computing Lab *
7 * ISTI - Italian National Research Council *
8 * *
9 * All rights reserved. *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the Mozilla Public License Version 2.0 as published *
13 * by the Mozilla Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * Mozilla Public License Version 2.0 *
20 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details. *
21 ****************************************************************************/
22
23#ifndef VCL_MISC_HASH_H
24#define VCL_MISC_HASH_H
25
26#include <functional>
27
28namespace vcl {
29
41template<typename T, typename... Rest>
42void hashCombine(std::size_t& seed, const T& v, const Rest&... rest)
43{
44 seed ^= std::hash<T> {}(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
45 (hashCombine(seed, rest), ...);
46}
47
48} // namespace vcl
49
50#endif // VCL_MISC_HASH_H