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86
Examples/Framework/include/ActsExamples/Framework/Required.hpp
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| // This file is part of the Acts project. | ||
| // | ||
| // Copyright (C) 2023 CERN for the benefit of the Acts project | ||
| // | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| #pragma once | ||
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| #include <iostream> | ||
| #include <optional> | ||
| #include <stdexcept> | ||
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| namespace ActsExamples { | ||
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| /// A simple std::optional like container which can only be overwritten by a | ||
| /// defined value. | ||
| template <typename T> | ||
| class Required { | ||
| public: | ||
| using value_type = T; | ||
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| constexpr Required() = default; | ||
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| constexpr Required(const T& data) : m_data(data) {} | ||
| constexpr Required(T&& data) : m_data(std::move(data)) {} | ||
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| constexpr Required(const Required& other) { | ||
| std::cout << "copy construct" << std::endl; | ||
| check(other.m_data); | ||
| m_data = other.m_data; | ||
| } | ||
| constexpr Required(Required&& other) { | ||
| std::cout << "move construct" << std::endl; | ||
| check(other.m_data); | ||
| m_data = std::move(other.m_data); | ||
| } | ||
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| Required& operator=(const Required& other) { | ||
| std::cout << "copy assignment" << std::endl; | ||
| check(other.m_data); | ||
| m_data = other.m_data; | ||
| return *this; | ||
| } | ||
| Required& operator=(Required&& other) { | ||
| std::cout << "move assignment" << std::endl; | ||
| check(other.m_data); | ||
| m_data = std::move(other.m_data); | ||
| return *this; | ||
| } | ||
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| T& operator*() noexcept { return get(); } | ||
| const T& operator*() const noexcept { return get(); } | ||
| T* operator->() noexcept { return &get(); } | ||
| const T* operator->() const noexcept { return &get(); } | ||
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| constexpr explicit operator bool() const noexcept { return has(); } | ||
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| constexpr bool has() const noexcept { return m_data.has_value(); } | ||
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| constexpr T& get() & { return m_data.value(); } | ||
| constexpr const T& get() const& { return m_data.value(); } | ||
| constexpr T get() && { return m_data.value(); } | ||
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| template <class... Args> | ||
| constexpr T& emplace(Args&&... args) { | ||
| return m_data.emplace(std::forward<Args>(args)...); | ||
| } | ||
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| template <class U, class... Args> | ||
| constexpr T& emplace(std::initializer_list<U> ilist, Args&&... args) { | ||
| return m_data.emplace(ilist, std::forward<Args>(args)...); | ||
| } | ||
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| private: | ||
| std::optional<T> m_data; | ||
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| static void check(const std::optional<T>& data) { | ||
| if (!data) { | ||
| throw std::runtime_error("data required"); | ||
| } | ||
| } | ||
| }; | ||
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| } // namespace ActsExamples |
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