In c++ there is only virtual destructors, no constructors. Why?
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Answer Posted / bala preethi
Since OOPS basics says always base class object to be
created and than its derivatives. So just consider the case
where we try to create object of derived class with virtual
contructor since pointer points to derived type object it
fetches derived constructor directly, without its base
class object constructed( instantiated )...
So Constructor cannot be made virtual bt when comes to case
of Destructor object destuction process must be reverse...
So we must make destructor as virtual.
This applies only when we going for Dynamic Memory
Allocation...
If, on the other hand, you were to have a pointer to object
A and assign it a dynamic object B, when you destroy it,
only object A's destructor is called and object B part of
the object is never destroyed. Virtual destructors are used
to solve this problem and destroy the objects in the right
order.
| Is This Answer Correct ? | 47 Yes | 14 No |
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Question In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Question Submitted By :: Sunil Kumar I also faced this Question!! Rank Answer Posted By Re: In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Answer # 1 use copy constructors 0 Shanthila There is something to be taken care in destructor, in copy constructor, suppose the memory is assigned to the embedded member object pointer with the parameter passed value, but if some other objects of different class also are pointing to this memory, then if some one deletes the object then this class member pointer object will become dangling, or if the object is not deleted properly then there will be memory leak. Please suggest the design change required to handle or avoid this situation
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