ProjectsDevelopment...C/C++ GuideDestructors...

Destructors in C++

Friday, December 16, 2005 by digitalpeer

Unlike virtual member functions, destructors will automatically call destructors of base classes if the base class declaration is virtual.

#include <iostream>
using namespace std;

class Base
{
public:
	Base()
	{
		cout << "Base::Base()" << endl;
	}

	virtual void VF()
	{
		cout << "Base::VF()" << endl;
	}

	virtual ~Base()
	{
		cout << "Base::~Base" << endl;
	}
};

class Derived : public Base
{
public:
	Derived()
	{
		cout << "Derived::Derived()" << endl;
	}

	void VF()
	{
		cout << "Derived::VF()" << endl;
		Base::VF();
	}

	~Derived()
	{
		cout << "Derived::~Derived" << endl;
	}
};

int main()
{
	Derived* d = new Derived();
	d->VF();
	delete d;
	return 0;
}

Results in:

Base::Base()
Derived::Derived()
Derived::VF()
Base::VF()
Derived::~Derived
Base::~Base