| /* |
| * 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 REQ_QUANTILE_CALCULATOR_IMPL_HPP_ |
| #define REQ_QUANTILE_CALCULATOR_IMPL_HPP_ |
| |
| namespace datasketches { |
| |
| template<typename T, typename C, typename A> |
| req_quantile_calculator<T, C, A>::req_quantile_calculator(uint64_t n, const A& allocator): |
| n_(n), |
| entries_(allocator) |
| {} |
| |
| template<typename T, typename C, typename A> |
| void req_quantile_calculator<T, C, A>::add(const T* begin, const T* end, uint8_t lg_weight) { |
| if (entries_.capacity() < entries_.size() + std::distance(begin, end)) entries_.reserve(entries_.size() + std::distance(begin, end)); |
| const size_t size_before = entries_.size(); |
| for (auto it = begin; it != end; ++it) entries_.push_back(Entry(it, 1 << lg_weight)); |
| if (size_before > 0) std::inplace_merge(entries_.begin(), entries_.begin() + size_before, entries_.end(), compare_pairs_by_first_ptr<C>()); |
| } |
| |
| template<typename T, typename C, typename A> |
| template<bool inclusive> |
| void req_quantile_calculator<T, C, A>::convert_to_cummulative() { |
| uint64_t subtotal = 0; |
| for (auto& entry: entries_) { |
| const uint64_t new_subtotal = subtotal + entry.second; |
| entry.second = inclusive ? new_subtotal : subtotal; |
| subtotal = new_subtotal; |
| } |
| } |
| |
| template<typename T, typename C, typename A> |
| const T* req_quantile_calculator<T, C, A>::get_quantile(double rank) const { |
| uint64_t weight = static_cast<uint64_t>(rank * n_); |
| auto it = std::lower_bound(entries_.begin(), entries_.end(), Entry(nullptr, weight), compare_pairs_by_second()); |
| if (it == entries_.end()) return entries_[entries_.size() - 1].first; |
| return it->first; |
| } |
| |
| } /* namespace datasketches */ |
| |
| #endif |