Re: [Boost-users] mpl::set and mpl::fold

1 Sep 2010


      AMDG

Paul Graphov wrote:
...
I've encountered a problem while using mpl::fold with mpl::set
I've defined a template to check if one sequence contains all elements of
the other:
namespace mpl = boost::mpl;
template<class A, class B>
struct subset
  : mpl::fold<
    A,
    mpl::true_,
    mpl::and_<mpl::_1, mpl::contains<B, mpl::_2> >
    >
{};
It works fine with lists and vectors but when first template parameter (A)
is set or set_c
it fails to compile. Did I miss something? Why is it impossible to iterate
through a set via fold?
It looks like fold is trying to increment past the end of the sequence.
It works for me with the trunk with set, but not with set_c.  I think the
problem is that end<> is broken for set_c.

In Christ,
Steven Watanabe