mirror of https://github.com/procxx/kepka.git
123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
/*
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This file is part of Kepka - The Unofficial Telegram Desktop client,
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see https://github.com/procxx/kepka
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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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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/procxx/kepka/blob/master/LICENSE
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Copyright (c) 2018 pro.cxx Community
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*/
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#pragma once
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#include "core/utils.h" // @todo used for base::take
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#include <QObject>
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#include <QPointer>
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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> class object_ptr {
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public:
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object_ptr(std::nullptr_t) {}
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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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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)
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: _object(base::take(other._object)) {}
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object_ptr &operator=(object_ptr &&other) {
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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 <typename OtherObject, typename = std::enable_if_t<std::is_base_of<Object, OtherObject>::value>>
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object_ptr(object_ptr<OtherObject> &&other)
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: _object(base::take(other._object)) {}
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template <typename OtherObject, typename = std::enable_if_t<std::is_base_of<Object, OtherObject>::value>>
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object_ptr &operator=(object_ptr<OtherObject> &&other) {
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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) {
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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 {
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return static_cast<Object *>(_object.data());
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}
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operator Object *() const {
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return data();
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}
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explicit operator bool() const {
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return _object != nullptr;
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}
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Object *operator->() const {
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return data();
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}
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Object &operator*() const {
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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> void create(Parent &&parent, Args &&... args) {
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destroy();
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_object = new Object(std::forward<Parent>(parent), std::forward<Args>(args)...);
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}
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void destroy() {
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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() {
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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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template <typename ResultType, typename SourceType>
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friend object_ptr<ResultType> static_object_cast(object_ptr<SourceType> source);
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private:
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template <typename OtherObject> friend class object_ptr;
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QPointer<QObject> _object;
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};
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template <typename ResultType, typename SourceType>
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inline object_ptr<ResultType> static_object_cast(object_ptr<SourceType> source) {
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auto result = object_ptr<ResultType>(nullptr);
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result._object = static_cast<ResultType *>(base::take(source._object).data());
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return std::move(result);
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}
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