Re: [boost] [cpo-proposal] presentation of the idea

On 08/28/13 10:37, Gottlob Frege wrote:

On Wed, Aug 28, 2013 at 8:51 AM, Larry Evans 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: http://article.gmane.org/gmane.comp.lib.boost.devel/243575 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. HTH. -Larry