RE: [boost] shared_ptr implementation without template friends

From: Borgerding, Mark A. (MarkAB_at_[hidden])
Date: 2000-07-28 08:03:07

I looked at it closer and the type safety is already guaranteed because of
the construction of 
px by r.get() -- so the function was fine in its original form.

> -----Original Message-----
> From: Borgerding, Mark A. [mailto:MarkAB_at_[hidden]]
> Sent: Friday, July 28, 2000 8:35 AM
> To: boost_at_[hidden]
> Subject: RE: [boost] shared_ptr implementation without 
> template friends
> 
> 
> A ptr assignment in the template constructor can solve the 
> problem of type
> relation:
> 
>     template<typename Y>
>     shared_ptr(const shared_ptr<Y>& r) throw() : px(r.get()) {
>       T * dummyptr = r.get(); 
>       // this will not compile if Y* cannot be made a T*
>       // a good compiler might be able to get rid of the runtime cost
> altogether
>       ++*(pn = reinterpret_cast<const shared_ptr<T>&>( r ).pn);
>    }
>