Re: [boost] [type_traits] Request: is_iterable

Subject: Re: [boost] [type_traits] Request: is_iterable
From: Nathan Crookston (nathan.crookston_at_[hidden])
Date: 2013-02-02 11:27:24

Hi Nevin,

Krzysztof Czainski wrote:

> Nathan Ridge:
> >
> > Nevin Liber:
> > > I'd like to make a request for an is_iterable<T> type trait, which
> detects
> > > if a type can be used in C++11 range-based for. I have a prototype
> which
> > > currently meets my needs (I can make it available; it detects if both
> > > std::begin(c) and std::end(c) can be called), but I'm wondering:
> > >
> > > a) What should the name be? (I'm not married to is_iterable)
> >
> > is_range ?
>
> +1

+1

> > > Does this sound like a good idea?
>
> +1
>
> There have been a few attempts in the past:

http://boost.2283326.n4.nabble.com/is-range-metafunction-td2650470.html
http://boost.2283326.n4.nabble.com/range-Trying-to-make-an-quot-is-range-quot-metafunction-td2580209.html

It seems most have concluded it's not possible in the general case.  I
think you could get close enough to count, however.  I'd be interested to
see the code, myself.

Thanks,
Nate