Can I use Pointer arithmetic on non‐array object?

Question

Following code is undefined behavior?

int main()
{
    int x[1] = { 0 };
    x + 1; // This is not undefined behavior.
    int y = 0;
    &y + 1; // Is this undefined behavior?
}

I want to use <algorithm> functions with non‐array object. e.g.

#include <iostream>
#include <iterator>
#include <algorithm>
int main()
{
    int x;
    // Is this undefined behavior?
    std::copy(&x, &x + 1, std::ostream_iterator<int>(std::cout));
}