Re: [Boost-users] What would happen if boost::shared_ptr is reset to an address in the stack

From: David Abrahams (dave_at_[hidden])
Date: 2007-10-16 14:13:52

on Tue Oct 16 2007, "Peng Yu" <pengyu.ut-AT-gmail.com> wrote:

> Hi,
>
> The following program runs well in my system. However, if I change 1
> to 0, it will terminate at the line with "delete". Does this mean that
> boost::shared_ptr can tell if the pointer is from the stack or the
> heap and does different things based on where the pointer is from?

No.  The termination is just an expression of the fact that you invoked
undefined behavior by passing an illegal argument to delete.

>
> Thanks,
> Peng
>
> #include <iostream>
> #include <boost/shared_ptr.hpp>
>
> int main() {
> #if 1//try change this to 0
>   int a[100];
>   boost::shared_ptr<int> p(a);
>   std::cout << std::endl;
> #else
>   int a[100];
>   delete a; // would terminate here
>   std::cout << std::endl;
> #endif
> }

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com