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Subject: Re: [boost] [cpo-proposal] presentation of the idea
From: Larry Evans (cppljevans_at_[hidden])
Date: 2013-08-29 12:08:28

On 08/28/13 10:37, Gottlob Frege wrote:
> On Wed, Aug 28, 2013 at 8:51 AM, Larry Evans <cppljevans_at_[hidden]>wrote:
>> On 08/27/13 23:51, Gottlob Frege wrote:
>>> char * space = make_space_for_item(handler->size()); // make space in
>>> vector<char>
>>> handler->do_copy(space, item); inplace copy construct
>> How does make_space_for_item assure the return value is aligned
>> properly for an Item type?
>> [snip]
> Well, I guess it would also need some kind of handler->alignment().
> make_space_for_item(handler->size(), handler->alignment());
> you would look at the end of the vector<char> and see if it aligns or how
> much you need to fudge there. So add enough for alignment + size and
> return the aligned address.
This "add enough for alignment+size" is what attachment to:

does; however, that code doesn't have anything like a
handler->alignment() since all the information about
the alignment requirements can be gotten from the
Item template argument to the push_back member function.



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