Very short inheritance question

[james]

the only thing you need is vritual function, please look at my replyed post
at "clarification - calling virtual function from destructor"
james

 

[Skirmish]

I am deriving B from A. Is it possible to have both A and B's
destructor called by calling Release in the base object?

#include <stdio.h>

//-------------Base Object-------------//
class A
{
public:
A(void) {}
~A(void) {printf("A is deleted\n");}
void Release(void) {delete this;}
};
//-------------------------------------//

//------------Child Object-------------//
class B : public A
{
public:
B(void) {}
~B(void) {printf("B is deleted\n");}
};
//-------------------------------------//

void main(int argc, char **argv)
{
B *b = new B();
b->Release();
getchar(); //keep console open
}

//OUTPUT: A is deleted

BTW this code is a simmered down version of memory managed object.
Cheers
-A-

 

[Sam Holden]

I am deriving B from A. Is it possible to have both A and B's
destructor called by calling Release in the base object?

~A(void) {printf("A is deleted\n");}

^
|
"virtual" goes here

See the FAQ:

http://www.parashift.com/c++-faq-lite/virtual-functions.html#faq-20.5

 

[Sharad Kala]

I am deriving B from A. Is it possible to have both A and B's
destructor called by calling Release in the base object?

#include <stdio.h>

//-------------Base Object-------------//
class A
{
public:
A(void) {}
~A(void) {printf("A is deleted\n");}
void Release(void) {delete this;}
};
//-------------------------------------//

//------------Child Object-------------//
class B : public A
{
public:
B(void) {}
~B(void) {printf("B is deleted\n");}
};
//-------------------------------------//

void main(int argc, char **argv)
{
B *b = new B();
b->Release();
getchar(); //keep console open
}

Yes. Change the destructor in your base class to be virtual.
virtual ~A(void) {printf("A is deleted\n");}
Call the release member function through a polymorphic pointer in main.

A* b= new B();
b->Release();

btw, your code should be using cout and not printf's.
Getting pedantic, main has never ever returned void so return int.

-Sharad