Is the “one-past-the-end” pointer of a non-array type a valid concept in C++?

Question

The C++ standard [sec 5.7] says:

If both the pointer operand and the result point to elements of the same array object, or one past the last element

Answer 1

No, it is legal. 5.7(4) - one paragraph before your quote - says: "For the purposes of these operators, a pointer to a nonarray object behaves the same as a pointer to the first element of an array of length one with the type of the object as its element type."