Like any other constant pointer, a constexpr pointer may point to a const or a nonconst type

constexpr int *np = nullptr; // np is a constant pointer to int that is
null
int j = 0;
constexpr int i = 42; // type of i is const int
// i and j must be defined outside any function
constexpr const int *p = &i; // p is a constant pointer to the const int i
constexpr int *p1 = &j; // p1 is a constant pointer to the int j