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

16 Oct 2007


      On 10/16/07, David Abrahams  wrote:
...
on Tue Oct 16 2007, "Peng Yu"  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 
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
}
I don't think my question was completely answered. Do you means
reseting shared_ptr with an array from the stack is not defined? Or it
is defined and shared_ptr can figure out it is from the stack and do
not delete it?

Thanks,
Peng