Re: [boost] [variant] Please vote for behavior

Subject: Re: [boost] [variant] Please vote for behavior
From: Gottlob Frege (gottlobfrege_at_[hidden])
Date: 2013-01-28 16:58:08

On Mon, Jan 28, 2013 at 4:47 PM, Joel de Guzman <djowel_at_[hidden]> wrote:

> On 1/29/13 5:06 AM, Gottlob Frege wrote:
>
>> On Mon, Jan 28, 2013 at 1:35 PM, Joel de Guzman <djowel_at_[hidden]> 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.
>
>
it == container.end()?

Or am I confused?

>
>  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
>
>
>
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