Steven Watanabe wrote:
AMDG
What does the default constructor have to do with it?
Also, the enable_if you put on it is wrong.
Since enable_if is wrong (no ::type), then I guess it is the other change (accessing the base through super_t) which corrects the problem below, right? #include <vector> #include <boost/range.hpp> #include <boost/iterator/cycle_iterator.hpp> #include <boost/iterator/cycle_iterator_ext.hpp> void example_iter(std::ostream& os){ using namespace boost; typedef double val_; typedef std::vector<val_> vec_; typedef range_size<vec_>::type size_; typedef range_iterator<vec_>::type base_it_; const unsigned n = 10; vec_ vec(n); typedef cycle_iterator<base_it_,size_> it_; typedef cycle_iterator_ext<base_it_,size_> it_ext_; it_ it(boost::begin(vec),boost::end(vec),0); it_ext_ it_ext(boost::begin(vec),boost::end(vec),0); it_ it2; //it2 = it; //error: attempt to copy from a singular iterator. it_ext_ it_ext2; it_ext2 = it_ext; }