Class has user-written copy constructor but no user-written assignment operator

Defect 104957 (STATIC_C)
Checker COPY_WITHOUT_ASSIGN (subcategory none)
File: /src/mongo/db/storage/biggie/store.h
Parse Warning (no function name available)
/src/mongo/db/storage/biggie/store.h, line: 208
Class "mongo::biggie::RadixStore<std::_cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::reverse_radix_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const *, std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const &>" has a user-written copy constructor "mongo::biggie::RadixStore<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::reverse_radix_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const *, std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const &>::reverse_radix_iterator(mongo::biggie::RadixStore<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::reverse_radix_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const *, std::pair<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::_cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const &> const &)" but no corresponding user-written assignment operator.

        class reverse_radix_iterator {

/src/mongo/db/storage/biggie/store.h, line: 246
User-written copy constructor.

            reverse_radix_iterator(const reverse_radix_iterator& other)