Answer / isha

Dear friend , you have done a mistake..
Example:

class Employee {
virtual ~Employee() {}
};

class Manager : public Employee {
~Manager() {}
}

Employee * m = new Manager();//here was the mistake
delete m; // <--

Answer / kamil mohamed

virtual destructor is recommended when you want to destroy
(delete) an object through it's parent pointer. This good
habit enforces proper cleanup of derived classes

Example:

class Employee {
virtual ~Employee() {}
};

class Manager : public Employee {
~Manager() {}
}

Manager * m = new Employee();
delete m; // <--

Answer / rock

When a derived class object pointed to by a base class
pointer dynamically is deleted only the base class
destructor is invoked inorder to even invoke derived class
destructor we use virtual destructor.

class shape
{
virtual ~shape(){}
};
class circle:public shape
{
~circle(){}
};
void main()
{
shape *sh = new circle;
delete sh; //both the destructors are invoked
}

If virtual keyword is not added to the base class
destructor only the base class destructor is called.

Answer / pankajkolte

Virtual Destructor is used basically to ensure proper the
sequence of call to destructor.

class Employee {
virtual ~Employee() {}
};

class Manager : public Employee {
~Manager() {}
}

Employee * m = new Manager();//here was the mistake
delete m; // <-

In this case base class destructor if marked as virtual so
as derived class destructor will get called first then base
class destructor.

Answer / suresh.k (portblair)

Using virtual destructors, you can destroy objects without
knowing their type - the correct destructor for the object
is invoked using the virtual function mechanism. Note that
destructors can also be declared as pure virtual functions
for abstract classes.

if someone will derive from your class, and if someone will
say "new Derived", where "Derived" is derived from your
class, and if someone will say delete p, where the actual
object's type is "Derived" but the pointer p's type is your
class.

Answer / rahul

virtual destructor is just to remove the variable without
knowing its type.....

Answer / maria alex

Normally virtual destructor is used to destroy a base class
object without knowing it's type...

What does oop mean in snapchat?

0 Answers  

In which cases you use override and new base?

2 Answers  

Why is destructor used?

0 Answers  

#include <stdio.h> #include <alloc.h> #include <stdlib.h> #include <conio.h> void insert(struct btreenode **, int); void inorder(struct btreenode *); struct btreenode { struct btreenode *leftchild; struct btreenode *rightchild; int data; }; main() { struct btreenode *bt; bt=(struct btreenode *)NULL; int req,i=1,num; clrscr(); printf("Enter number of nodes"); scanf("%d",&req); while(i<=req) { printf("Enter element"); scanf("%d",&num); insert(&bt,num); i++; } inorder(bt); } void insert(struct btreenode **sr, int num) { if(*sr==NULL) { *sr=(struct btreenode *)malloc (sizeof(struct btreenode)); (*sr)->leftchild=(struct btreenode *)NULL; (*sr)->rightchild=(struct btreenode *)NULL; (*sr)->data=num; return; } else { if(num < (*sr)->data) insert(&(*sr)->leftchild,num); else insert(&(*sr)->rightchild,num); } return; } void inorder(struct btreenode *sr) { if(sr!=(struct btreenode *)NULL) { inorder(sr->leftchild); printf("\n %d",sr->data); inorder(sr->rightchild); } else return; } please Modify the given program and add two methods for post order and pre order traversals.

0 Answers  

What is difference between pop and oop?

0 Answers  

What is a function in oop?

0 Answers  

Can we call a base class method without creating instance?

6 Answers  

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1 Answers  

What is abstrac class?where is it use?

2 Answers  

Tell me the scenario,Where we can use interfaces or Abstract class.And What is the difference between interfaces and abstract class?

5 Answers  

to find out the minimum of two integer number of two different classes using friend function

0 Answers  

write a program to find 2 power of a 5digit number with out using big int and exponent ?

0 Answers