Re: [boost] [optional] memory use for optional refs and ptrs

Subject: Re: [boost] [optional] memory use for optional refs and ptrs
From: Larry Evans (cppljevans_at_[hidden])
Date: 2010-10-06 14:59:26

On 10/06/10 13:33, Rutger ter Borg wrote:
[snip]
> Is there some
> kind of facility that is able to point to "padding space" in aligned
> structures? (perhaps a facility of the alignment stuff in boost)?
> 
[snip]
There's:

https://svn.boost.org/trac/boost/browser/sandbox/variadic_templates/boost/composite_storage/alignment/aligned_offset.hpp

It's used to calculate the distance between the end of 1 element
in a tuple and the start of the next element so that that next
element will have the proper alignment.  IOW, if:

  aligned_offset<Offset,Alignment>::remainder != 0

then there will be padding in the amount:

  value-Offset

That is, IIRC.

HTH.

-Larry