#include <boost/heap/d_ary_heap.hpp>

template<typename T>
struct Foo {
  typename boost::heap::d_ary_heap<T, boost::heap::arity<2>, boost::heap::mutable_<true>>::ordered_iterator it;
  Foo() : it() {}
};

int main() {
  auto heap = boost::heap::d_ary_heap<int, boost::heap::arity<2>, boost::heap::mutable_<true>>();
  heap.push(1);
  auto foo = Foo<int>();
  foo.it = heap.ordered_begin();
}