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Virtual D'tor

General and Gameplay Programming Programming

Started by The C modest god July 29, 2005 01:26 PM

1 comment, last by The C modest god 18 years, 8 months ago

The C modest god

100

Author

July 29, 2005 01:26 PM

If I have the following code:


class A {
  public:
    virtual ~A();
};

class B: public A {
  public:
    string str;
};

A * pointer;

pointer = new B;
delete pointer;

On the last line, will the D'tor of str will be called?

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Enigma

1,410

July 29, 2005 01:36 PM

Short answer: Yes.

Longer answer: Like any other virtual function a virtual destructor means that the function called is determined at runtime based on the dynamic type of the pointed at object. Since pointer points to a B and A's destructor is virtual the expression delete pointer; will cause B's destructor to be called. B's destructor will then destroy its member objects and then its base classes, in this case destroying str and then its A base class part.

Enigma