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rocksdb/util/dynamic_bloom.h

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// Copyright (c) 2013, 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.
#pragma once
#include <atomic>
#include <memory>
namespace rocksdb {
class Slice;
class DynamicBloom {
public:
// total_bits: fixed total bits for the bloom
// hash_func: customized hash function
// num_probes: number of hash probes for a single key
DynamicBloom(uint32_t total_bits,
uint32_t (*hash_func)(const Slice& key),
uint32_t num_probes = 6);
explicit DynamicBloom(uint32_t total_bits, uint32_t num_probes = 6);
// Assuming single threaded access to Add
void Add(const Slice& key);
// Multithreaded access to MayContain is OK
bool MayContain(const Slice& key);
private:
uint32_t (*hash_func_)(const Slice& key);
uint32_t total_bits_;
uint32_t num_probes_;
std::unique_ptr<unsigned char[]> data_;
};
}