uninitialized_fill
using __STD::uninitialized_fill;
uninitialized_fill(*__cur, *__cur + _S_buffer_size(), __value);
uninitialized_fill(_M_finish._M_first, _M_finish._M_cur, __value);
uninitialized_fill(__new_start, _M_start, __x);
uninitialized_fill(_M_finish, __new_finish, __x);
uninitialized_fill(__result, __mid, __x);
uninitialized_fill(__mid2, __last2, __x);