from 'constexpr _ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, allocator<_Tp>&) [with _InputIterator = __gnu_cxx::__normal_iterator<const short unsigned int*, std::vector<short unsigned int>; _Tail = {std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&}; <template-parameter-2-3> = void; long unsigned int)' forming offset 2 is