CODEWITHSUNDEEP
c++virtual-destructor
Kushagra Jaiswal
Kushagra Jaiswal

Reputation: 335

How virtual mechanism works in the case of virtual destructor

How do I get the member function pointer of a destructor?

here some-one answered that we can't get the function pointer of a destructor then how the virtual mechanism work in the below code. Is virtual constructor is saved in the virtual table or not?? if not then how virtual mechanism work in the case of virtual destructor?

#include<stdio.h>
class Base
{
    public:
    Base()
    {
          printf("C-Base\n");
    }

    virtual ~Base()
    {
           printf("Base\n");
    }
 };

 class Derived:public Base
 {
     public:
     Derived()
    {
         printf("C-DErived\n");
     }
     ~Derived()
     {
         printf("DErived\n");
     }
 };

int main()
{

     Base *b=new Derived();
     delete b;
 }

in this code if we not use virtual in Base class Destructor Derived class destructor will not called.

Upvotes: 4

Views: 283

Answers (2)

AnT stands with Russia
AnT stands with Russia

Reputation: 320671

When someone says that you can't get a pointer to the destructor it means that there is no source-code-level syntax for this. But under the hood the destructor is still an ordinary function, which is indeed typically accessed through a pointer stored in the virtual table.

In other words, it is specifically you, who can't obtain such a pointer. The compiler itself has no problems obtaining it. Quod licet Iovi non licet bovi.

Upvotes: 10

Sebastian Redl
Sebastian Redl

Reputation: 72054

Just because you can't get a pointer to the destructor, doesn't mean the compiler can't for its own internal, nefarious purposes.

(As a side note, the compiler often generates more than one version of the destructor, with more than one entry in the vtable, which makes it incompatible with normal function pointers.)

Upvotes: 5

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