rocksdb/util/hash.h

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// Simple hash function used for internal data structures
#pragma once
#include <stddef.h>
#include <stdint.h>
#include "rocksdb/slice.h"
namespace rocksdb {
extern uint32_t Hash(const char* data, size_t n, uint32_t seed);
inline uint32_t BloomHash(const Slice& key) {
return Hash(key.data(), key.size(), 0xbc9f1d34);
}
inline uint32_t GetSliceHash(const Slice& s) {
return Hash(s.data(), s.size(), 397);
}
// std::hash compatible interface.
struct SliceHasher {
uint32_t operator()(const Slice& s) const { return GetSliceHash(s); }
};
} // namespace rocksdb