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

7 Mar 2008


      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