Re: [boost] shared_ptr: unsafe, or am I crazy?

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-01-14 10:13:50

From: "David Abrahams" <david.abrahams_at_[hidden]>
> struct Base { Base(); ~Base(); };
> struct Derived : Base { Derived(); ~Derived(); };
> 
> void unsafe()
> {
>     shared_ptr<Derived> d(new Derived);
>     shared_ptr<Base> b(d);
>     d.reset();
>     b.reset(); // equivalent to delete (Base*)(new Derived)!!
> };
> 
> Isn't shared_ptr just screaming for the application of John Maddock's new
> is_polymorphic<> trait?

The new shared_ptr works. You can even have shared_ptr<void> as b.

--
Peter Dimov
Multi Media Ltd.