Hello! In modern C++ there is almost no need to use raw *new* and *delete*. As Bjarne Stroustrup is saying in his “A Tour of C++”: “Avoid ‘‘naked’’ new and delete operations; §4.2.2.”. We use standard containers and smart pointers for that, with std::make_shared and std::make_unique functions for smart pointers creation.
In Qt we also have QSharedPointer and QSharedPointer<T>::create(…) method. But we don’t use smart pointers in Qt much, due to parent-driven memory model. And most of QObjects are created with raw *new* operations. Maybe it is a proper thing to add some C++14-style wrapper for creating QObjects like this: 1. namespace Qt <http://qt-project.org/doc/Qt.html> 2. { 3. template<class T, class... Args> 4. QPointer <http://qt-project.org/doc/QPointer.html><T> MakePointer( Args&&... args) 5. { 6. T* pObject = new T(std::forward<Args>(args)...); 7. Q_ASSERT(pObject->parent() != nullptr); 8. return pObject; 9. } 10. } Now, one can safely call Qt::MakePointer to create a QObject and be sure it will not leak due to an assertion for an existing parent. And it will free all the calling code from raw *new*operations. One can always use raw *delete* to destroy the object, but he does not have to. And even if he will, it will not lead to dangling pointers problem since QPointer is automatically set to null in this case. I’m planning to use this approach in my code. Do you think it is relevant? Are there any drawbacks? PS This is a cross-post of my question from Qt forums: http://qt-project.org/forums/viewthread/48541, where SGaist <http://qt-project.org/mebmer/39728> suggested me to post here. ----- Best regards, Mikhail Matrosov
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