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upgrade datasketches lib from 4.1.0 to 5.0.1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| /* | ||
| * 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 _OPTIONAL_HPP_ | ||
| #define _OPTIONAL_HPP_ | ||
|
|
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| // This is a simplistic substitute for std::optional until we require C++17 | ||
|
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| #if (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) | ||
| #include <optional> | ||
| using std::optional; | ||
| #else | ||
|
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| #include <type_traits> | ||
|
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| namespace datasketches { | ||
|
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| template<typename T> | ||
| class optional { | ||
| public: | ||
|
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| optional() noexcept: initialized_(false) {} | ||
|
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| optional(const T& value) noexcept(std::is_nothrow_copy_constructible<T>::value) { | ||
| new (&value_) T(value); | ||
| initialized_ = true; | ||
| } | ||
|
|
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| optional(T&& value) noexcept(std::is_nothrow_move_constructible<T>::value) { | ||
| new (&value_) T(std::move(value)); | ||
| initialized_ = true; | ||
| } | ||
|
|
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| // conversion from compatible types | ||
| template<typename TT> | ||
| optional(const optional<TT>& other) noexcept(std::is_nothrow_constructible<T, TT>::value): initialized_(false) { | ||
| if (other.initialized_) { | ||
| new (&value_) T(other.value_); | ||
| initialized_ = true; | ||
| } | ||
| } | ||
|
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| optional(const optional& other) noexcept(std::is_nothrow_copy_constructible<T>::value): initialized_(false) { | ||
| if (other.initialized_) { | ||
| new (&value_) T(other.value_); | ||
| initialized_ = true; | ||
| } | ||
| } | ||
|
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| optional(optional&& other) noexcept(std::is_nothrow_move_constructible<T>::value): initialized_(false) { | ||
| if (other.initialized_) { | ||
| new (&value_) T(std::move(other.value_)); | ||
| initialized_ = true; | ||
| } | ||
| } | ||
|
|
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| ~optional() noexcept(std::is_nothrow_destructible<T>::value) { | ||
| if (initialized_) value_.~T(); | ||
| } | ||
|
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| explicit operator bool() const noexcept { | ||
| return initialized_; | ||
| } | ||
|
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| optional& operator=(const optional& other) | ||
| noexcept(std::is_nothrow_copy_constructible<T>::value && std::is_nothrow_copy_assignable<T>::value) { | ||
| if (initialized_) { | ||
| if (other.initialized_) { | ||
| value_ = other.value_; | ||
| } else { | ||
| reset(); | ||
| } | ||
| } else { | ||
| if (other.initialized_) { | ||
| new (&value_) T(other.value_); | ||
| initialized_ = true; | ||
| } | ||
| } | ||
| return *this; | ||
| } | ||
|
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| optional& operator=(optional&& other) | ||
| noexcept(std::is_nothrow_move_constructible<T>::value && std::is_nothrow_move_assignable<T>::value) { | ||
| if (initialized_) { | ||
| if (other.initialized_) { | ||
| value_ = std::move(other.value_); | ||
| } else { | ||
| reset(); | ||
| } | ||
| } else { | ||
| if (other.initialized_) { | ||
| new (&value_) T(std::move(other.value_)); | ||
| initialized_ = true; | ||
| } | ||
| } | ||
| return *this; | ||
| } | ||
|
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| template<typename... Args> | ||
| void emplace(Args&&... args) noexcept(std::is_nothrow_constructible<T, Args...>::value) { | ||
| new (&value_) T(args...); | ||
| initialized_ = true; | ||
| } | ||
|
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| T& operator*() & noexcept { return value_; } | ||
| const T& operator*() const & noexcept { return value_; } | ||
| T&& operator*() && noexcept { return std::move(value_); } | ||
| const T&& operator*() const && noexcept { return std::move(value_); } | ||
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| T* operator->() noexcept { return &value_; } | ||
| const T* operator->() const noexcept { return &value_; } | ||
|
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| void reset() noexcept(std::is_nothrow_destructible<T>::value) { | ||
| if (initialized_) value_.~T(); | ||
| initialized_ = false; | ||
| } | ||
|
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| private: | ||
| union { | ||
| T value_; | ||
| }; | ||
| bool initialized_; | ||
|
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| // for converting constructor | ||
| template<typename TT> friend class optional; | ||
| }; | ||
|
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| } // namespace | ||
|
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| #endif // C++17 | ||
|
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| #endif // _OPTIONAL_HPP_ |
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