On 1/29/13 5:06 AM, Gottlob Frege wrote:
On Mon, Jan 28, 2013 at 1:35 PM, Joel de Guzman <djowel@gmail.com> wrote
No. It's still just operator(T const&). You can't use a "singular
valued" recursive_wrapper in any other operation apart from assignment, destruction or move.
How do I know if is it singular valued?
How do you know if an iterator is singular valued? You can't. Same here. Do I need to check everywhere? No, you don't have to. You don't need to.
Basically, can you guarantee the never "leak out" and are destroyed or assigned immediately after the move?
No, you can't guarantee that, and you don't disallow that. But likewise, neither can you guarantee that a singular valued iterator leaks out into the wild. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com