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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/unique_ptr.h"
#include <cstddef>
#include <utility>
namespace td {
// copyable by value td::unique_ptr
template <class T>
class unique_value_ptr final {
public:
unique_value_ptr() noexcept = default;
unique_value_ptr(const unique_value_ptr &other) {
if (other != nullptr) {
ptr_ = make_unique<T>(*other);
}
}
unique_value_ptr &operator=(const unique_value_ptr &other) {
if (other == nullptr) {
ptr_ = nullptr;
} else {
ptr_ = make_unique<T>(*other);
}
return *this;
}
unique_value_ptr(unique_value_ptr &&) noexcept = default;
unique_value_ptr &operator=(unique_value_ptr &&) = default;
unique_value_ptr(std::nullptr_t) noexcept {
}
unique_value_ptr(unique_ptr<T> &&ptr) noexcept : ptr_(std::move(ptr)) {
}
T *get() noexcept {
return ptr_.get();
}
const T *get() const noexcept {
return ptr_.get();
}
T *operator->() noexcept {
return ptr_.get();
}
const T *operator->() const noexcept {
return ptr_.get();
}
T &operator*() noexcept {
return *ptr_;
}
const T &operator*() const noexcept {
return *ptr_;
}
explicit operator bool() const noexcept {
return ptr_ != nullptr;
}
private:
unique_ptr<T> ptr_;
};
template <class T>
bool operator==(const unique_value_ptr<T> &p, std::nullptr_t) {
return !p;
}
template <class T>
bool operator!=(const unique_value_ptr<T> &p, std::nullptr_t) {
return static_cast<bool>(p);
}
template <class T>
bool operator==(const unique_value_ptr<T> &lhs, const unique_value_ptr<T> &rhs) {
if (lhs == nullptr) {
return rhs == nullptr;
}
return rhs != nullptr && *lhs == *rhs;
}
template <class T>
bool operator!=(const unique_value_ptr<T> &lhs, const unique_value_ptr<T> &rhs) {
return !(lhs == rhs);
}
template <class Type, class... Args>
unique_value_ptr<Type> make_unique_value(Args &&...args) {
return unique_value_ptr<Type>(make_unique<Type>(std::forward<Args>(args)...));
}
} // namespace td
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