| /* |
| * 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 ARRAY_OF_DOUBLES_SKETCH_HPP_ |
| #define ARRAY_OF_DOUBLES_SKETCH_HPP_ |
| |
| #include <vector> |
| #include <memory> |
| |
| #include "serde.hpp" |
| #include "tuple_sketch.hpp" |
| |
| namespace datasketches { |
| |
| // This sketch is equivalent of ArrayOfDoublesSketch in Java |
| |
| // This simple array of double is faster than std::vector and should be sufficient for this application |
| template<typename Allocator = std::allocator<double>> |
| class aod { |
| public: |
| explicit aod(uint8_t size, const Allocator& allocator = Allocator()): |
| allocator_(allocator), size_(size), array_(allocator_.allocate(size_)) { |
| std::fill(array_, array_ + size_, 0); |
| } |
| aod(const aod& other): |
| allocator_(other.allocator_), |
| size_(other.size_), |
| array_(allocator_.allocate(size_)) |
| { |
| std::copy(other.array_, other.array_ + size_, array_); |
| } |
| aod(aod&& other) noexcept: |
| allocator_(std::move(other.allocator_)), |
| size_(other.size_), |
| array_(other.array_) |
| { |
| other.array_ = nullptr; |
| } |
| ~aod() { |
| if (array_ != nullptr) allocator_.deallocate(array_, size_); |
| } |
| aod& operator=(const aod& other) { |
| aod copy(other); |
| std::swap(allocator_, copy.allocator_); |
| std::swap(size_, copy.size_); |
| std::swap(array_, copy.array_); |
| return *this; |
| } |
| aod& operator=(aod&& other) { |
| std::swap(allocator_, other.allocator_); |
| std::swap(size_, other.size_); |
| std::swap(array_, other.array_); |
| return *this; |
| } |
| double& operator[](size_t index) { return array_[index]; } |
| double operator[](size_t index) const { return array_[index]; } |
| uint8_t size() const { return size_; } |
| double* data() { return array_; } |
| const double* data() const { return array_; } |
| bool operator==(const aod& other) const { |
| for (uint8_t i = 0; i < size_; ++i) if (array_[i] != other.array_[i]) return false; |
| return true; |
| } |
| private: |
| Allocator allocator_; |
| uint8_t size_; |
| double* array_; |
| }; |
| |
| template<typename A = std::allocator<double>> |
| class array_of_doubles_update_policy { |
| public: |
| array_of_doubles_update_policy(uint8_t num_values = 1, const A& allocator = A()): |
| allocator_(allocator), num_values_(num_values) {} |
| aod<A> create() const { |
| return aod<A>(num_values_, allocator_); |
| } |
| template<typename InputVector> // to allow any type with indexed access (such as double*) |
| void update(aod<A>& summary, const InputVector& update) const { |
| for (uint8_t i = 0; i < num_values_; ++i) summary[i] += update[i]; |
| } |
| uint8_t get_num_values() const { |
| return num_values_; |
| } |
| |
| private: |
| A allocator_; |
| uint8_t num_values_; |
| }; |
| |
| // forward declaration |
| template<typename A> class compact_array_of_doubles_sketch_alloc; |
| |
| template<typename A> using AllocAOD = typename std::allocator_traits<A>::template rebind_alloc<aod<A>>; |
| |
| template<typename A = std::allocator<double>> |
| class update_array_of_doubles_sketch_alloc: public update_tuple_sketch<aod<A>, aod<A>, array_of_doubles_update_policy<A>, AllocAOD<A>> { |
| public: |
| using Base = update_tuple_sketch<aod<A>, aod<A>, array_of_doubles_update_policy<A>, AllocAOD<A>>; |
| using resize_factor = typename Base::resize_factor; |
| |
| class builder; |
| |
| compact_array_of_doubles_sketch_alloc<A> compact(bool ordered = true) const; |
| uint8_t get_num_values() const; |
| |
| private: |
| // for builder |
| update_array_of_doubles_sketch_alloc(uint8_t lg_cur_size, uint8_t lg_nom_size, resize_factor rf, uint64_t theta, |
| uint64_t seed, const array_of_doubles_update_policy<A>& policy, const A& allocator); |
| }; |
| |
| // alias with the default allocator for convenience |
| using update_array_of_doubles_sketch = update_array_of_doubles_sketch_alloc<>; |
| |
| template<typename A> |
| class update_array_of_doubles_sketch_alloc<A>::builder: public tuple_base_builder<builder, array_of_doubles_update_policy<A>, A> { |
| public: |
| builder(const array_of_doubles_update_policy<A>& policy = array_of_doubles_update_policy<A>(), const A& allocator = A()); |
| update_array_of_doubles_sketch_alloc<A> build() const; |
| }; |
| |
| template<typename A = std::allocator<double>> |
| class compact_array_of_doubles_sketch_alloc: public compact_tuple_sketch<aod<A>, AllocAOD<A>> { |
| public: |
| using Base = compact_tuple_sketch<aod<A>, AllocAOD<A>>; |
| using Entry = typename Base::Entry; |
| using AllocEntry = typename Base::AllocEntry; |
| using AllocU64 = typename Base::AllocU64; |
| using vector_bytes = typename Base::vector_bytes; |
| |
| static const uint8_t SERIAL_VERSION = 1; |
| static const uint8_t SKETCH_FAMILY = 9; |
| static const uint8_t SKETCH_TYPE = 3; |
| enum flags { UNUSED1, UNUSED2, IS_EMPTY, HAS_ENTRIES, IS_ORDERED }; |
| |
| template<typename Sketch> |
| compact_array_of_doubles_sketch_alloc(const Sketch& other, bool ordered = true); |
| |
| uint8_t get_num_values() const; |
| |
| void serialize(std::ostream& os) const; |
| vector_bytes serialize(unsigned header_size_bytes = 0) const; |
| |
| static compact_array_of_doubles_sketch_alloc deserialize(std::istream& is, uint64_t seed = DEFAULT_SEED, const A& allocator = A()); |
| static compact_array_of_doubles_sketch_alloc deserialize(const void* bytes, size_t size, uint64_t seed = DEFAULT_SEED, |
| const A& allocator = A()); |
| |
| // for internal use |
| compact_array_of_doubles_sketch_alloc(bool is_empty, bool is_ordered, uint16_t seed_hash, uint64_t theta, std::vector<Entry, AllocEntry>&& entries, uint8_t num_values); |
| compact_array_of_doubles_sketch_alloc(uint8_t num_values, Base&& base); |
| private: |
| uint8_t num_values_; |
| }; |
| |
| // alias with the default allocator for convenience |
| using compact_array_of_doubles_sketch = compact_array_of_doubles_sketch_alloc<>; |
| |
| } /* namespace datasketches */ |
| |
| #include "array_of_doubles_sketch_impl.hpp" |
| |
| #endif |