Destructors and inheritance in C++?

Question

I use Borland C++ Builder.

And i had o problem

#include <Classes.hpp>
class TMyObject : public TObject
{
   __fastcall TMyObject();
   __fastcall ~TMyObject();//I would like to inherite my destructor from TObject
};

__fastcall TMyObject::TMyObject() : TObject()//it will inherited my constructor from TObject
{
}

And for that new destructor that will inherite ~TObject?

__fastcall TMyObject::~TMyObject?????????????

Answer 1

This can be solved at TObject's level. Its destructor has to be virtual:

#include <Classes.hpp>
class TObject 
{
   __fastcall TObject();
   virtual __fastcall ~TObject(); 
};

This way you can either do:

TObject * pobj = new TMyObject();
delete pobj;

or

TMyObject * pobj = new TMyObject();
delete pobj;

Both destructors will be called (~TMyObject() first and then ~TObject()) and you will have no leak.

Answer 2

Destructor of the Base class will be automatically called by the compiler, when your objet life time ends. you do not need to call it explicitly.

TMyObject::TMyObject() : TObject()

Does not inherit the constructor.
It is called as Member initializer list and it initializes the Base class object with a particular value.

When you create the object.

TMyObject obj;

The constructors will be called in order:

constructor of TObject
constructor of TMyObject 

When the object life time ends the destructors will be called in the order:

destructor of TMyObject 
destructr of TObject

The compiler will do so for you, do not need to call it explicitly.