| /* |
| * 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 CEILING_POWER_OF_2_HPP_ |
| #define CEILING_POWER_OF_2_HPP_ |
| |
| #include <cstdint> |
| |
| namespace datasketches { |
| |
| // compute the next highest power of 2 of 32-bit n |
| // taken from https://graphics.stanford.edu/~seander/bithacks.html |
| static inline uint32_t ceiling_power_of_2(uint32_t n) { |
| --n; |
| n |= n >> 1; |
| n |= n >> 2; |
| n |= n >> 4; |
| n |= n >> 8; |
| n |= n >> 16; |
| return ++n; |
| } |
| |
| } /* namespace datasketches */ |
| |
| #endif // CEILING_POWER_OF_2_HPP_ |