The C++ using virtual destructor to avoid memory leaks.

virtual_destructor.cpp

// Written by Javed Ahmed - F2019266402
#include <iostream>
using namespace std;

class Base {
public:
    virtual void func() {
        cout << "Base Fun is called\n";
    }

    ~ Base () {
        cout << "Base Destructor is called\n";
    }
};

class Derived : public Base {
public:
    virtual void func() {
        cout << "Dervied class func is called\n";
    }

    ~ Derived () {
        cout << "Dervied class destructor is callled.\n";
    }
};

int main()
{

    Base *b1 = new Base();
    Base *b2 = new Derived();

    b1->func();
    b2->func();

    delete b1;
    delete b2;

	return 0;
}