Re: [boost] downcasting smart pointers

From: Kevlin Henney (kevlin_at_[hidden])
Date: 2001-03-19 01:14:32

In message <034e01c0afc7$09032e50$37781990_at_[hidden]>, Greg Colvin
<gcolvin_at_[hidden]> writes
>From: Eric Ford <eford_at_[hidden]>
>> I'm using the counted_ptr from http://ootips.org/yonat/4dev/ which is
>> similar to boost's shared_ptr.  However, I've run into a problem.  I'm
>> willing to switch to the boost smart pointers, if they offer a
>> solution
>> to my problem.  (But I'm guessing that a solution for one would work for
>> the other.)  Any help with either would be appreciated...
>> 
>> I have an STL container of counted_ptr<A>'s.  At some point I need to
>> do a dynamic downcast of a counted_ptr<A> to a counted_ptr<B>.  How do
>> I do that?  
>
>Right now you don't.  It has been on our chronic list of
>missing features for a long time but no one has been
>motivated enough to contibute a solution.

I may be mistaken, but I thought it had been discussed and possible code
samples had been posted some time back -- something like
dynamic_shared_cast.

Kevlin
____________________________________________________________

  Kevlin Henney                   phone:  [phone]
  Curbralan Limited               mobile: [phone]
  mailto:kevlin_at_[hidden]     fax:    [phone]
  http://www.curbralan.com
____________________________________________________________