mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-25 14:34:29 +00:00
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// Declarations for hash functions. -*- C++ -*-
|
|
|
|
// Copyright (C) 2010-2018 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file bits/hash_bytes.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly. @headername{functional}
|
|
*/
|
|
|
|
#ifndef _HASH_BYTES_H
|
|
#define _HASH_BYTES_H 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#include <bits/c++config.h>
|
|
|
|
namespace std
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
// Hash function implementation for the nontrivial specialization.
|
|
// All of them are based on a primitive that hashes a pointer to a
|
|
// byte array. The actual hash algorithm is not guaranteed to stay
|
|
// the same from release to release -- it may be updated or tuned to
|
|
// improve hash quality or speed.
|
|
size_t
|
|
_Hash_bytes(const void* __ptr, size_t __len, size_t __seed);
|
|
|
|
// A similar hash primitive, using the FNV hash algorithm. This
|
|
// algorithm is guaranteed to stay the same from release to release.
|
|
// (although it might not produce the same values on different
|
|
// machines.)
|
|
size_t
|
|
_Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed);
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif
|