QT smart pointer error prone point

1. Qt The method of dynamic conversion between smart pointers in is qSharedPointerDynamicCast, Using this method does not increase the reference count .
2. take this When the pointer is converted into a smart pointer , Can't use QSharedPointer(this) This way, , Instead, use sharedFromThis() This kind of method .
3. Construction and type conversion are easy to make mistakes :

 Code of non smart pointer :
Base *p = new Derived();

 Error conversion writing of smart pointer :
// Wrong writing 1
QSharedPointer<Base> p(new Derived);
// Wrong writing 2
QSharedPointer<Base> p = QSharedPointer<Base>(new Derived);
// Write it correctly :
QSharedPointer<Base> p = QSharedPointer<Derived>(new Derived);
// Ensure that the types are consistent when constructing , The work of type conversion is left to ”=”.