Dan wrote:
I'm trying to use iter_fold with a vector_c to compute the sum of all of the integers in the container.
What I have is:
template<typename Sequence> struct sum { typedef typename mpl::iter_fold< Sequence, typename mpl::begin<Sequence>::type, mpl::plus< mpl::deref<_1>, mpl::deref<_2> >; // ^ what should this really be?
// what do i put after here? };
Which obviously won't work. I don't know how to keep a running total as I iterate over the sequence with plus.
I don't know why you are using iter_fold instead of just fold here, but anyway: template<typename Sequence> struct sum { typedef typename mpl::iter_fold< Sequence , mpl::int_<0> , mpl::plus<mpl::_1, mpl::deref<mpl::_2> > >::type type; }; HTH, -- Daniel Wallin