Re: [boost] [smart_ptr] copyable_ptr?

Subject: Re: [boost] [smart_ptr] copyable_ptr?
From: Gottlob Frege (gottlobfrege_at_[hidden])
Date: 2009-07-16 17:40:20

On Thu, Jul 16, 2009 at 4:46 PM, Ross Levine<ross.levine_at_[hidden]> wrote:
> I was wondering if boost has considered a smart pointer that is similar to
> scoped_ptr but supports deep copy semantics. This would be useful in classes
> which use the pimpl idiom, as a common way to program these classes is with
> a scoped_ptr or auto_ptr, but then a copy constructor and copy assignment
> operator needs to be defined. Herb Sutter worked on an implementation at
> http://www.gotw.ca/gotw/062.htm, so there's precedent. Is there any interest
> for this?

You might want to consider copy on write.
eg

http://stlab.adobe.com/classadobe_1_1version__1_1_1copy__on__write.html
http://stlab.adobe.com/wiki/index.php/Copy_On_Write

Tony