Re: [boost] [mpl] is there a or_seq like logical metafunction?

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-03-07 10:32:12

AMDG

Giovanni Piero Deretta wrote:
> It seems a perfect application for fold:
>
> template<typename Seq>
> struct or_seq
>     : mpl::apply<
>           mpl::fold<mpl::_1, mpl::false_,  mpl::quote2<mpl::or_> >
>         , Seq
>       > {};
>
> template<typename Seq>
> struct and_seq
>     : mpl::apply<
>           mpl::fold<mpl::_1, mpl::true_,  mpl::quote2<mpl::and_> >
>         , Seq
>       > {};
>   

Not quite, because we want it to short circuit.
Not to mention that quote2 will not work on and_ and or_.

In Christ,
Steven Watanabe