Re: [boost] [review][pimpl_ptr] Pimpl Pointer review begins

From: Martin Bonner (martin.bonner_at_[hidden])
Date: 2006-05-19 06:28:14

----Original Message----
From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]] On Behalf Of Asger Mangaard
Sent: 19 May 2006 09:28 To: boost_at_[hidden]
Subject: Re: [boost] [review][pimpl_ptr] Pimpl Pointer review begins

> Tobias Schwinger wrote:
>>> Could you give an example?
>>> 
>> 
>> Let's see (untested and incomplete code for illustration only):
>> ....
> 
> It seems like you assume that two pimpl_ptr instances can hold the
> same pointer. This is _not_ the case. Each instance of pimpl_ptr
> will have its own instance of T, thus the COW (copy on non const
> access) isn't needed. 

I thought Tobias' code was supposed to be an example of how to use a
putative COW_pimpl_ptr, not an example of how to use the current code.
For such a class obviously two instances _can_ hold the same pointer
(that would be the whole POINT of the class!)

-- 
Martin Bonner
Martin.Bonner_at_[hidden]
Pi Technology, Milton Hall, Ely Road, Milton, Cambridge, CB4 6WZ,
ENGLAND Tel: [phone]