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67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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namespace base {
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template <typename T>
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struct required {
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template <
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typename U,
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typename = std::enable_if_t<std::is_constructible_v<T, U&&>>>
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constexpr required(U &&value) noexcept : _value(std::forward<U>(value)) {
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}
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template <
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typename U,
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typename = std::enable_if_t<std::is_assignable_v<T, U&&>>>
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constexpr required &operator=(U &&value) noexcept {
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_value = std::forward<U>(value);
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return *this;
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}
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constexpr required(required &&) = default;
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constexpr required(const required &) = default;
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constexpr required &operator=(required &&) = default;
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constexpr required &operator=(const required &) = default;
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[[nodiscard]] constexpr T &operator*() noexcept {
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return _value;
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}
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[[nodiscard]] constexpr const T &operator*() const noexcept {
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return _value;
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}
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[[nodiscard]] constexpr T &value() noexcept {
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return _value;
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}
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[[nodiscard]] constexpr const T &value() const noexcept {
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return _value;
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}
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[[nodiscard]] constexpr T *operator->() noexcept {
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return &_value;
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}
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[[nodiscard]] constexpr const T *operator->() const noexcept {
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return &_value;
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}
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[[nodiscard]] constexpr T *get() noexcept {
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return &_value;
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}
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[[nodiscard]] constexpr const T *get() const noexcept {
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return &_value;
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}
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[[nodiscard]] operator T&() noexcept {
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return _value;
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}
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[[nodiscard]] operator const T&() const noexcept {
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return _value;
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}
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private:
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T _value;
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};
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} // namespace base
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