| /* |
| * 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 <memory> |
| |
| #include "MurmurHash3.h" |
| |
| namespace datasketches { |
| |
| /// CPC constants |
| namespace cpc_constants { |
| /// min log2 of K |
| const uint8_t MIN_LG_K = 4; |
| /// max log2 of K |
| const uint8_t MAX_LG_K = 26; |
| /// default log2 of K |
| const uint8_t DEFAULT_LG_K = 11; |
| } |
| |
| // forward declaration |
| template<typename A> class u32_table; |
| |
| template<typename A> |
| struct compressed_state { |
| using vector_u32 = std::vector<uint32_t, typename std::allocator_traits<A>::template rebind_alloc<uint32_t>>; |
| |
| explicit compressed_state(const A& allocator): table_data(allocator), table_data_words(0), table_num_entries(0), |
| window_data(allocator), window_data_words(0) {} |
| vector_u32 table_data; |
| uint32_t table_data_words; |
| uint32_t table_num_entries; // can be different from the number of entries in the sketch in hybrid mode |
| vector_u32 window_data; |
| uint32_t window_data_words; |
| }; |
| |
| template<typename A> |
| struct uncompressed_state { |
| using vector_bytes = std::vector<uint8_t, typename std::allocator_traits<A>::template rebind_alloc<uint8_t>>; |
| |
| explicit uncompressed_state(const A& allocator): table(allocator), window(allocator) {} |
| u32_table<A> table; |
| vector_bytes window; |
| }; |
| |
| } /* namespace datasketches */ |
| |
| #endif |