| /* |
| * 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 CPC_COMMON_HPP_ |
| #define CPC_COMMON_HPP_ |
| |
| #include "MurmurHash3.h" |
| #include <memory> |
| |
| namespace datasketches { |
| |
| static const uint8_t CPC_MIN_LG_K = 4; |
| static const uint8_t CPC_MAX_LG_K = 26; |
| static const uint8_t CPC_DEFAULT_LG_K = 11; |
| static const uint64_t DEFAULT_SEED = 9001; |
| |
| static uint16_t compute_seed_hash(uint64_t seed) { |
| HashState hashes; |
| MurmurHash3_x64_128(&seed, sizeof(seed), 0, hashes); |
| return hashes.h1 & 0xffff; |
| } |
| |
| } /* namespace datasketches */ |
| |
| #endif |