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1 | // Declarations for hash functions. -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2010-2023 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // Under Section 7 of GPL version 3, you are granted additional | |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
24 | ||
25 | /** @file bits/hash_bytes.h | |
26 | * This is an internal header file, included by other library headers. | |
27 | * Do not attempt to use it directly. @headername{functional} | |
28 | */ | |
29 | ||
30 | #ifndef _HASH_BYTES_H | |
31 | #define _HASH_BYTES_H 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
35 | #include <bits/c++config.h> | |
36 | ||
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37 | namespace std |
38 | { | |
39 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
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40 | |
41 | // Hash function implementation for the nontrivial specialization. | |
42 | // All of them are based on a primitive that hashes a pointer to a | |
43 | // byte array. The actual hash algorithm is not guaranteed to stay | |
44 | // the same from release to release -- it may be updated or tuned to | |
45 | // improve hash quality or speed. | |
46 | size_t | |
47 | _Hash_bytes(const void* __ptr, size_t __len, size_t __seed); | |
48 | ||
49 | // A similar hash primitive, using the FNV hash algorithm. This | |
50 | // algorithm is guaranteed to stay the same from release to release. | |
51 | // (although it might not produce the same values on different | |
52 | // machines.) | |
53 | size_t | |
54 | _Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed); | |
55 | ||
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56 | _GLIBCXX_END_NAMESPACE_VERSION |
57 | } // namespace | |
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58 | |
59 | #endif |