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// Declarations for hash functions. -*- C++ -*-

// Copyright (C) 2010, 2011 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