Subject: Re: [boost] [variant] Heads-up!
From: Antony Polukhin (antoshkka_at_[hidden])
Date: 2019-04-29 19:08:42
пн, 29 апр. 2019 г. в 21:52, Steven Watanabe via Boost <boost_at_[hidden]>:
>
> AMDG
>
> On 4/29/19 11:30 AM, Antony Polukhin via Boost wrote:
> >
> > I've merged a very cool optimization by Nikita Kniazev into the master
> > branch. From now on boost::variant does pointer stealing for recursive
> > variants.
> >
> > This significantly improves the performance of the variants move constructors.
> >
> > However if you use a variant variable after the std::move for anything
> > except destruction and assignment then you're getting an UB. Beware!
> >
>
> We've had this discussion before:
> https://listarchives.boost.org/Archives/boost/2013/02/200744.php
This discussion was considered. Please see the two comments from
Nikita Kniazev https://github.com/boostorg/variant/pull/59#issuecomment-459573177
-- Best regards, Antony Polukhin