94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/unique_ptr.h"
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#include <cstddef>
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#include <utility>
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namespace td {
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// copyable by value td::unique_ptr
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template <class T>
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class unique_value_ptr final {
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public:
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unique_value_ptr() noexcept = default;
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unique_value_ptr(const unique_value_ptr &other) {
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if (other != nullptr) {
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ptr_ = make_unique<T>(*other);
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}
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}
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unique_value_ptr &operator=(const unique_value_ptr &other) {
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if (other == nullptr) {
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ptr_ = nullptr;
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} else {
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ptr_ = make_unique<T>(*other);
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}
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return *this;
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}
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unique_value_ptr(unique_value_ptr &&) noexcept = default;
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unique_value_ptr &operator=(unique_value_ptr &&) = default;
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unique_value_ptr(std::nullptr_t) noexcept {
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}
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unique_value_ptr(unique_ptr<T> &&ptr) noexcept : ptr_(std::move(ptr)) {
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}
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T *get() noexcept {
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return ptr_.get();
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}
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const T *get() const noexcept {
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return ptr_.get();
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}
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T *operator->() noexcept {
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return ptr_.get();
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}
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const T *operator->() const noexcept {
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return ptr_.get();
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}
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T &operator*() noexcept {
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return *ptr_;
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}
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const T &operator*() const noexcept {
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return *ptr_;
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}
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explicit operator bool() const noexcept {
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return ptr_ != nullptr;
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}
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private:
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unique_ptr<T> ptr_;
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};
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template <class T>
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bool operator==(const unique_value_ptr<T> &p, std::nullptr_t) {
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return !p;
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}
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template <class T>
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bool operator!=(const unique_value_ptr<T> &p, std::nullptr_t) {
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return static_cast<bool>(p);
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}
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template <class T>
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bool operator==(const unique_value_ptr<T> &lhs, const unique_value_ptr<T> &rhs) {
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if (lhs == nullptr) {
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return rhs == nullptr;
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}
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return rhs != nullptr && *lhs == *rhs;
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}
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template <class T>
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bool operator!=(const unique_value_ptr<T> &lhs, const unique_value_ptr<T> &rhs) {
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return !(lhs == rhs);
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}
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template <class Type, class... Args>
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unique_value_ptr<Type> make_unique_value(Args &&...args) {
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return unique_value_ptr<Type>(make_unique<Type>(std::forward<Args>(args)...));
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}
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} // namespace td
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