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Class destructor is being called twice


Class destructor is being called twice

By : CJ Summers
Date : November 17 2020, 04:28 AM
help you fix your problem The destructor for A is called twice because there are two objects that need to be destroyed. By printing something when the copy or move constructor is called you can verify this:
code :
class A {
protected:
  A() { cout << "Executing A()" << endl; }
public:
  A(const A &) { cout << "Executing A(const A &)" << endl; }
  // with recent compilers, you could also try A(A &&)
  ~A() { cout << "Executing ~A()" << endl; }
};
Executing A()
Executing B()
Executing C()
Executing A(const A &)
Executing ~C()
Executing ~B()
Executing ~A()
Executing ~A()
const A &a = C();


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Why is base-class destructor called on derived object when destructor of derived class is non-virtual?

Why is base-class destructor called on derived object when destructor of derived class is non-virtual?


By : Jin Wang
Date : March 29 2020, 07:55 AM
like below fixes the issue Once A's destructor is declared virtual, the destructors of all derived classes are also virtual, even if they aren't explicitly declared as such.. So the behaviour you see is exactly what is expected
Throwing exception in derived class constructor. Why is base class destructor called but not derived class destructor?

Throwing exception in derived class constructor. Why is base class destructor called but not derived class destructor?


By : Bambhu Kumar
Date : March 29 2020, 07:55 AM
it should still fix some issue The object isn't considered fully constructed until its constructor returns, and, destructor is not called on incomplete objects.
Inner class destructor is called after Base class destructor

Inner class destructor is called after Base class destructor


By : Kamal Kishor
Date : March 29 2020, 07:55 AM
it should still fix some issue i have a basic and simply question. ,
Is this the normal behavior?
If the destructor of a subclass was called, can I stop the call to the destructor of its base class?

If the destructor of a subclass was called, can I stop the call to the destructor of its base class?


By : Tundar
Date : March 29 2020, 07:55 AM
should help you out You are correct that the B class destructor will be called if the a D instance is destructed. The call to delete ab; in the D dtor is a bug.
The other thing to consider with this code, is that because B's dtor is not virtual you cannot delete an instance of D via a B pointer.
When the destructor of a subclass is called, will the destructor of a parent class also be called?

When the destructor of a subclass is called, will the destructor of a parent class also be called?


By : awran5
Date : March 29 2020, 07:55 AM
should help you out If ChildClass is derived from ParentClass then the derived destructor is called first, followed by the parent class. As it stands in your code, ChildClass does not inherit from ParentClass
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