text: //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
  //  This source code is licensed under both the GPLv2 (found in the
  //  COPYING file in the root directory) and Apache 2.0 License
  //  (found in the LICENSE.Apache file in the root directory).
  //
  /*
    Murmurhash from http://sites.google.com/site/murmurhash/
  
    All code is released to the public domain. For business purposes, Murmurhash is
    under the MIT license.
  */
  #pragma once
  #include <stdint.h>
  #include "rocksdb/slice.h"
  
  #if defined(__x86_64__)
  #define MURMUR_HASH MurmurHash64A
  uint64_t MurmurHash64A ( const void * key, int len, unsigned int seed );
  #define MurmurHash MurmurHash64A
  typedef uint64_t murmur_t;
  
  #elif defined(__i386__)
  #define MURMUR_HASH MurmurHash2
  unsigned int MurmurHash2 ( const void * key, int len, unsigned int seed );
  #define MurmurHash MurmurHash2
  typedef unsigned int murmur_t;
  
  #else
  #define MURMUR_HASH MurmurHashNeutral2
  unsigned int MurmurHashNeutral2 ( const void * key, int len, unsigned int seed );
  #define MurmurHash MurmurHashNeutral2
  typedef unsigned int murmur_t;
  #endif
  
  // Allow slice to be hashable by murmur hash.
  namespace rocksdb {
  struct murmur_hash {
    size_t operator()(const Slice& slice) const {
      return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0);
    }
  };
  }  // rocksdb
  