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C++ Virtual Destructor vs Destructor

VARAK-VURAK answered on November 13, 2022 Popularity 9/10 Helpfulness 4/10

answer C++ Virtual Destructor vs Destructor

C++ Virtual Destructor vs Destructor

Comment

// CPP program without virtual destructor
// causing undefined behavior
#include <iostream>
 
using namespace std;
 
class base {
  public:
    base()    
    { cout << "Constructing base\n"; }
    ~base()
    { cout<< "Destructing base\n"; }    
};
 
class derived: public base {
  public:
    derived()    
     { cout << "Constructing derived\n"; }
    ~derived()
       { cout << "Destructing derived\n"; }
};
 
int main()
{
  derived *d = new derived(); 
  base *b = d;
  delete b;
  getchar();
  return 0;
}

/* OUTPUT
Constructing base
Constructing derived
Destructing base
*/


// A program with virtual destructor
#include <iostream>
 
using namespace std;
 
class base {
  public:
    base()    
    { cout << "Constructing base\n"; }
    virtual ~base()
    { cout << "Destructing base\n"; }    
};
 
class derived : public base {
  public:
    derived()    
    { cout << "Constructing derived\n"; }
    virtual ~derived()
    { cout << "Destructing derived\n"; }
};
 
int main()
{
  derived *d = new derived(); 
  base *b = d;
  delete b;
  getchar();
  return 0;
}

/*OUTPUT
Constructing base
Constructing derived
Destructing derived
Destructing base
*/
///

Popularity 9/10 Helpfulness 4/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++ destructor virtual-destructor

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Contributed on Nov 13 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

C++ Virtual Destructor vs Destructor

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