120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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// Smart pointer for QObject*, has move semantics, destroys object if it doesn't have a parent.
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template <typename Object>
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class object_ptr {
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public:
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object_ptr(std::nullptr_t) noexcept {
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}
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// No default constructor, but constructors with at least
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// one argument are simply make functions.
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template <typename Parent, typename... Args>
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explicit object_ptr(Parent &&parent, Args&&... args)
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: _object(new Object(std::forward<Parent>(parent), std::forward<Args>(args)...)) {
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}
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static object_ptr<Object> fromRaw(Object *value) noexcept {
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object_ptr<Object> result = { nullptr };
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result._object = value;
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return result;
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}
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Object *release() noexcept {
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return static_cast<Object*>(base::take(_object).data());
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}
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object_ptr(const object_ptr &other) = delete;
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object_ptr &operator=(const object_ptr &other) = delete;
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object_ptr(object_ptr &&other) noexcept : _object(base::take(other._object)) {
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}
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object_ptr &operator=(object_ptr &&other) noexcept {
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auto temp = std::move(other);
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destroy();
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std::swap(_object, temp._object);
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return *this;
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}
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template <
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typename OtherObject,
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typename = std::enable_if_t<
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std::is_base_of_v<Object, OtherObject>>>
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object_ptr(object_ptr<OtherObject> &&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 OtherObject,
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typename = std::enable_if_t<
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std::is_base_of_v<Object, OtherObject>>>
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object_ptr &operator=(object_ptr<OtherObject> &&other) noexcept {
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_object = base::take(other._object);
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return *this;
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}
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object_ptr &operator=(std::nullptr_t) noexcept {
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_object = nullptr;
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return *this;
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}
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// So we can pass this pointer to methods like connect().
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Object *data() const noexcept {
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return static_cast<Object*>(_object.data());
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}
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operator Object*() const noexcept {
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return 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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Object *operator->() const noexcept {
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return data();
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}
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Object &operator*() const noexcept {
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return *data();
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}
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// Use that instead "= new Object(parent, ...)"
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template <typename Parent, typename... Args>
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Object *create(Parent &&parent, Args&&... args) {
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destroy();
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_object = new Object(
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std::forward<Parent>(parent),
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std::forward<Args>(args)...);
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return data();
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}
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void destroy() noexcept {
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delete base::take(_object);
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}
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void destroyDelayed() {
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if (_object) {
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if (auto widget = base::up_cast<QWidget*>(data())) {
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widget->hide();
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}
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base::take(_object)->deleteLater();
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}
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}
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~object_ptr() noexcept {
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if (auto pointer = _object) {
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if (!pointer->parent()) {
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destroy();
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}
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}
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}
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private:
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template <typename OtherObject>
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friend class object_ptr;
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QPointer<QObject> _object;
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};
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