mirror of https://github.com/procxx/kepka.git
136 lines
4.1 KiB
C++
136 lines
4.1 KiB
C++
//
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// This file is part of Kepka,
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// an unofficial desktop version of Telegram messaging app,
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// see https://github.com/procxx/kepka
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//
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// Kepka 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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//
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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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//
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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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//
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// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
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// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
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//
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#pragma once
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#include <memory>
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// @todo replace this with std::experimental::observer_ptr
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#include <QCoreApplication>
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#include <utility>
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namespace base {
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class enable_weak_from_this;
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template <typename T> class weak_unique_ptr;
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class enable_weak_from_this {
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public:
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enable_weak_from_this() = default;
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enable_weak_from_this(const enable_weak_from_this &other) noexcept {}
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enable_weak_from_this(enable_weak_from_this &&other) noexcept {}
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enable_weak_from_this &operator=(const enable_weak_from_this &other) noexcept {
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return *this;
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}
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enable_weak_from_this &operator=(enable_weak_from_this &&other) noexcept {
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return *this;
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}
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private:
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template <typename Child> friend class weak_unique_ptr;
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std::shared_ptr<enable_weak_from_this *> getGuarded() const {
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if (!_guarded) {
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_guarded = std::make_shared<enable_weak_from_this *>(
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const_cast<enable_weak_from_this *>(static_cast<const enable_weak_from_this *>(this)));
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}
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return _guarded;
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}
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mutable std::shared_ptr<enable_weak_from_this *> _guarded;
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};
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template <typename T> class weak_unique_ptr {
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public:
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weak_unique_ptr() = default;
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weak_unique_ptr(T *value)
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: _guarded(value ? value->getGuarded() : std::shared_ptr<enable_weak_from_this *>()) {}
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weak_unique_ptr(const std::unique_ptr<T> &value)
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: weak_unique_ptr(value.get()) {}
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weak_unique_ptr &operator=(T *value) {
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_guarded = value ? value->getGuarded() : std::shared_ptr<enable_weak_from_this *>();
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return *this;
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}
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weak_unique_ptr &operator=(const std::unique_ptr<T> &value) {
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return (*this = value.get());
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}
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T *get() const noexcept {
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if (auto shared = _guarded.lock()) {
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return static_cast<T *>(*shared);
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}
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return nullptr;
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}
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explicit operator bool() const noexcept {
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return !!_guarded.lock();
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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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private:
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std::weak_ptr<enable_weak_from_this *> _guarded;
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};
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template <typename T> inline bool operator==(const weak_unique_ptr<T> &pointer, std::nullptr_t) {
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return (pointer.get() == nullptr);
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}
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template <typename T> inline bool operator==(std::nullptr_t, const weak_unique_ptr<T> &pointer) {
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return (pointer == nullptr);
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}
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template <typename T> inline bool operator!=(const weak_unique_ptr<T> &pointer, std::nullptr_t) {
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return !(pointer == nullptr);
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}
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template <typename T> inline bool operator!=(std::nullptr_t, const weak_unique_ptr<T> &pointer) {
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return !(pointer == nullptr);
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}
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template <typename T> weak_unique_ptr<T> make_weak_unique(T *value) {
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return weak_unique_ptr<T>(value);
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}
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template <typename T> weak_unique_ptr<T> make_weak_unique(const std::unique_ptr<T> &value) {
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return weak_unique_ptr<T>(value);
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}
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} // namespace base
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#ifdef QT_VERSION
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template <typename Lambda> inline void InvokeQueued(base::enable_weak_from_this *context, Lambda &&lambda) {
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QObject proxy;
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QObject::connect(&proxy, &QObject::destroyed, QCoreApplication::instance(),
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[guard = base::make_weak_unique(context), lambda = std::forward<Lambda>(lambda)] {
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if (guard) {
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lambda();
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}
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},
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Qt::QueuedConnection);
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}
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#endif // QT_VERSION
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