Am Wednesday 28 October 2009 15:31:55 schrieb Gottlob Frege:
On Tue, Oct 27, 2009 at 7:13 PM, Domagoj Saric <dsaritz@gmail.com> wrote:
...because that is what i was whishing for to be extracted from optional<> - the placement new/in-place construction + aligned storage + reference workarounds&co. wrapped up machinery...
...for example: 1.... 2.... 3....
4. An in-place fast pimpl. see Herb Sutter's http://www.gotw.ca/gotw/028.htm for why not to do this.
that is not the same thing as gottlob was proposing. boost::optional<> doesn't have the problems herb sutter lists, and a type that is only used for in place construction, without optional's conditional bool, wouldn't either. I've been missing such a type, too, but I think it should be part of the boost in place utility instead of boost::optional: http://www.boost.org/doc/libs/1_35_0/libs/utility/in_place_factories.html see "container-side usage" there.