neighbor_view_iterator& operator--()
{
--view_.partner_index();
// Because view_.partner_first_index() have to access neighbor_list, one has to check its validity
while (view_.source() > 0 and view_.partner_index() < view_.partner_first_index())
--view_.source();
return *this;
}
neighbor_view_iterator& operator++()
{
++view_.partner_index();
// Because view_.partner_last_index() have to access neighbor_list, one has to check its validity
while (view_.source()+1 < view_.partner_first_indices_size() and view_.partner_index() >= view_.partner_last_index())
++view_.source();
return *this;
}