Re: [boost] [Variant] Documentation Questions/Notes

Subject: Re: [boost] [Variant] Documentation Questions/Notes
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2012-10-27 15:51:22

AMDG

On 10/27/2012 10:50 AM, Dave Abrahams wrote:
> 
> <snip>
> 
> - The  "temporary heap backup" technique seems to have a hole:
> 
>    1. Copy-construct the content of the left-hand side to the heap;
>       call the pointer to this data backup.
>    2. Destroy the content of the left-hand side.
>    3. Copy-construct the content of the right-hand side in the
>       (now-empty) storage of the left-hand side.
>    4. In the event of failure, copy backup to the left-hand side
>       storage.
>    5. In the event of success, deallocate the data pointed to by
>       backup.
> 
>   What happens in the event of a failure in step 4?
> 

backup is a pointer.  Copying it can't fail.

> <snip>

In Christ,
Steven Watanabe