Re: [boost] [variant2] Andrzej's review -- design

Subject: Re: [boost] [variant2] Andrzej's review -- design
From: Peter Dimov (pdimov_at_[hidden])
Date: 2019-04-03 01:20:11

Gavin Lambert wrote:

> Requiring that variants always possess an empty state dramatically 
> simplifies implementation, including default construction and move 
> assignment.  And it avoids the valueless_by_exception kludge by promoting 
> it to an entirely expected possible state of variant. (Thereby increasing 
> the chance that consumers will consider it.)

That's more or less what using `monostate` as the first alternative 
achieves.