Re: [Boost-users] [shared_ptr] A newbie boost::shared_ptr question

From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-05-09 18:27:43

Olivier Tournaire wrote:

>     if ( typeid(m_rectangle.get()) == typeid(rectangle*) )
>     {
>         boost::shared_ptr<rectangle> rect( 
> (rectangle*)(m_rectangle.get()) );

This is the cause of your immediate problem. You are creating a second 
shared_ptr to the same raw pointer. This second shared_ptr has no knowledge 
of m_rectangle and will call delete on the raw pointer when it goes out of 
scope. Why not just use m_rectangle inside the if? You don't need the cast 
or the second shared_ptr.