| /* |
| * 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 _COMMON_DEFS_HPP_ |
| #define _COMMON_DEFS_HPP_ |
| |
| #include <cstdint> |
| #include <string> |
| #include <memory> |
| |
| namespace datasketches { |
| |
| static const uint64_t DEFAULT_SEED = 9001; |
| |
| template<typename A> using AllocChar = typename std::allocator_traits<A>::template rebind_alloc<char>; |
| template<typename A> using string = std::basic_string<char, std::char_traits<char>, AllocChar<A>>; |
| |
| // utility function to hide unused compiler warning |
| // usually has no additional cost |
| template<typename T> void unused(T&&...) {} |
| |
| // common helping functions |
| // TODO: find a better place for them |
| |
| constexpr uint8_t log2(uint32_t n) { |
| return (n > 1) ? 1 + log2(n >> 1) : 0; |
| } |
| |
| constexpr uint8_t lg_size_from_count(uint32_t n, double load_factor) { |
| return log2(n) + ((n > static_cast<uint32_t>((1 << (log2(n) + 1)) * load_factor)) ? 2 : 1); |
| } |
| |
| } // namespace |
| |
| #endif // _COMMON_DEFS_HPP_ |