Subject: Re: [Boost-users] [fusion] nth runtime element of a sequence
From: Larry Evans (cppljevans_at_[hidden])
Date: 2014-02-24 09:28:10
On 02/24/14 05:04, Krzysztof Czainski wrote:
> 2014-02-24 11:55 GMT+01:00 MM <finjulhich_at_[hidden]
> <mailto:finjulhich_at_[hidden]>>:
>
> Hello,
>
> I just wanted to confirm there's no provided method to get the n'th
> element of say a fusion vector where n is known at runtime, except
> of handling it explicitkly with a switch case?
>
> Thanks
>
> MM
>
>
> If such a function existed, what return type would it have?
>
> Regards,
> Kris
>
What about:
variant<T1,T2,T3> get(unsigned n, vector<T1,T2,T3>)
? For example:
vector<T1,T2,T3> vec(T1(),T2(),T3());
variant<T1,T2,T3> var;
var = get(2,vec);
assert(var.which(),2);
-regards,
Larry