132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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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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class unique_qptr {
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public:
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unique_qptr() = default;
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unique_qptr(std::nullptr_t) noexcept {
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}
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explicit unique_qptr(T *pointer) noexcept
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: _object(pointer) {
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}
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unique_qptr(const unique_qptr &other) = delete;
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unique_qptr &operator=(const unique_qptr &other) = delete;
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unique_qptr(unique_qptr &&other) noexcept
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: _object(base::take(other._object)) {
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}
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unique_qptr &operator=(unique_qptr &&other) noexcept {
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if (_object != other._object) {
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destroy();
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_object = base::take(other._object);
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}
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return *this;
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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_base_of_v<T, U>>>
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unique_qptr(unique_qptr<U> &&other) noexcept
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: _object(base::take(other._object)) {
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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_base_of_v<T, U>>>
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unique_qptr &operator=(unique_qptr<U> &&other) noexcept {
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if (_object != other._object) {
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destroy();
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_object = base::take(other._object);
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}
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return *this;
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}
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unique_qptr &operator=(std::nullptr_t) noexcept {
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destroy();
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return *this;
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}
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template <typename ...Args>
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explicit unique_qptr(std::in_place_t, Args &&...args)
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: _object(new T(std::forward<Args>(args)...)) {
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}
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template <typename ...Args>
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T *emplace(Args &&...args) {
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reset(new T(std::forward<Args>(args)...));
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return get();
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}
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void reset(T *value = nullptr) noexcept {
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if (_object != value) {
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destroy();
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_object = value;
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}
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}
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T *get() const noexcept {
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return static_cast<T*>(_object.data());
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}
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operator T*() const noexcept {
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return get();
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}
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T *release() noexcept {
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return static_cast<T*>(base::take(_object).data());
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}
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explicit operator bool() const noexcept {
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return _object != nullptr;
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}
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T *operator->() const noexcept {
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return get();
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}
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T &operator*() const noexcept {
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return *get();
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}
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~unique_qptr() noexcept {
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destroy();
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}
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private:
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void destroy() noexcept {
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delete base::take(_object).data();
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}
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template <typename U>
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friend class unique_qptr;
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QPointer<QObject> _object;
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};
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template <typename T, typename ...Args>
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inline unique_qptr<T> make_unique_q(Args &&...args) {
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return unique_qptr<T>(std::in_place, std::forward<Args>(args)...);
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}
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} // namespace base
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