Subject: Re: [boost] Feature request: variant::view
From: Klemens Morgenstern (klemens.morgenstern_at_[hidden])
Date: 2016-06-19 09:54:24
Am 19.06.2016 um 15:31 schrieb TONGARI J:
> Sometimes we need to view a value as a variant and we don't want to copy
> the value into a variant.
> It'd be great if there's a variant::view that works like a variant but
> holds a reference to the value instead.
> The constructor should allow any reference to the types as in the variant,
> and a constructor that takes a reference to the variant, e.g.
> template<class T1, class T2...>
> class variant<T1, T2...>::view
> And we can use apply_visitor/get on a view as on a variant.
Why not boost::variant<T1*, T2*> ?
I guess boost::variant<boost::none, T1&, T2&> would also work
(boost::none, if it needs to be default-constructible)
Or do you need to use the same visitors?
> Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk