| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #ifndef _HARMONICNUMBERS_HPP_ |
| #define _HARMONICNUMBERS_HPP_ |
| |
| #include <cstdint> |
| #include <memory> |
| |
| namespace datasketches { |
| |
| template<typename A = std::allocator<char>> |
| class HarmonicNumbers { |
| public: |
| /** |
| * This is the estimator you would use for flat bit map random accessed, similar to a Bloom filter. |
| * @param bitVectorLength the length of the bit vector in bits. Must be > 0. |
| * @param numBitsSet the number of bits set in this bit vector. Must be ≥ 0 and ≤ |
| * bitVectorLength. |
| * @return the estimate. |
| */ |
| static double getBitMapEstimate(int bitVectorLength, int numBitsSet); |
| |
| private: |
| static double harmonicNumber(uint64_t x_i); |
| }; |
| |
| } |
| |
| #include "HarmonicNumbers-internal.hpp" |
| |
| #endif /* _HARMONICNUMBERS_HPP_ */ |