On Mon, Apr 28, 2008 at 3:50 AM, David Abrahams <dave@boost-consulting.com> wrote:
on Fri Mar 07 2008, Steven Watanabe <watanabesj-AT-gmail.com> wrote:
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_.
Yeah, these should be rewritten in terms of mpl::find. Not sure why mpl::apply was used here either, though maybe I'm missign something.
There is, in fact, no need to use it here. I'm just so used to write 'apply' to prevent ugly "typename ... ::type" boilerplate that instinctively stick it in mpl expressions even when they do not add anything. -- gpd