Re: [boost] [variant] Maintainer

Subject: Re: [boost] [variant] Maintainer
From: Peter Dimov (lists_at_[hidden])
Date: 2015-07-14 14:03:20

Larry Evans wrote:
> >> What about variant<>, or is that disallowed?
> >> If it is disallowed, then tuple<> should, I guess, also be disallowed.

variant<T1,...,Tn> has N(T1)+N(T2)+...+N(Tn) valid values, whereas 
tuple<T1,...,Tn> has N(T1)*N(T2)*...*N(Tn) valid values, where N(T) is the 
number of valid values T has. It follows that variant<> has zero valid 
values, whereas tuple<> has one.