Re: delete an inherited class

From:
alasham.said@gmail.com
Newsgroups:
comp.lang.c++.moderated
Date:
Sun, 27 Apr 2008 15:46:32 CST
Message-ID:
<3df510bf-954f-4f03-9fc1-ffeff973b2df@l64g2000hse.googlegroups.com>
On Apr 27, 8:39 pm, Free0...@gmail.com wrote:

if i make a class that inherit another class, when i delete the
pointer casted to the inherited class, only the destructor of the
inherited class fires, the base class does not.

ex:

class shape
{
 ~shape()

}

class square : class shape
{
 ~square()

}

square pSquare = new square();

shape pShape = dynamic_cast<shape *>(pSquare);

delete pShape; <== only calls ~shape()


Hello,

Please always post minimal compilable code.

You need to make base's destructor virtual:

#include <iostream>

struct shape
{
     virtual ~shape() { std::cout << "shape::~shape\n"; }
};

struct square : public shape
{
     ~square() { std::cout << "square::~square\n"; }
};

int main()
{
     square* pSquare = new square();

     shape* pShape = dynamic_cast<shape *>(pSquare);

     delete pShape;

     std::cin.get();

     return 0;
}

Regards.

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