Destructor/ in C++

When an object is about to be destroyed, a member function called the destructor is automatically called. Destructors are hence the final functions to be called before an object is destroyed.

Characteristics of Destructor:

• Destructor function is automatically invoked when the objects are destroyed.

• It cannot be declared static or const.

• The destructor does not have arguments.

• It has no return type not even void.

• An object of a class with a Destructor cannot become a member of the union.

• A destructor should be declared in the public section of the class.

• The programmer cannot access the address of destructor.

When is destructor called?
A destructor function is called automatically when the object goes out of scope:
(1) the function ends
(2) the program ends
(3) a block containing local variables ends
(4) a delete operator is called

#include<iostream>
using namespace std;
int count=0;
class Test
{
    public:
        Test()
        {
            count++;
            cout<<"\n No. of Object created:\t"<<count;
        }

        ~Test()
        {
            cout<<"\n No. of Object destroyed:\t"<<count;
            --count;
        }
};

main()
{
    Test t,t1,t2,t3;
    return 0;
}

Output
 No. of Object created:    1
 No. of Object created:    2
 No. of Object created:    3
 No. of Object created:    4
 No. of Object destroyed:    4
 No. of Object destroyed:    3
 No. of Object destroyed:    2
 No. of Object destroyed:    1

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