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

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?

Try to pass "a" to a boost::shared_ptr<int> that isn't on the stack and try it :) You may just be lucky this gets popped while "a" is still there. Is that your question?

From: "Peng Yu" Reply-To: boost-users@lists.boost.org To: boost-users@lists.boost.org Subject: Re: [Boost-users] What would happen if boost::shared_ptr is resetto an address in the stack Date: Tue, 16 Oct 2007 14:26:33 -0500

On 10/16/07, David Abrahams wrote:

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on Tue Oct 16 2007, "Peng Yu" wrote:

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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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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