Take the address of a one-past-the-end array element via subscript: legal by the C++ Standard or not?

Question

I have seen it asserted several times now that the following code is not allowed by the C++ Standard:

int array[5];
int *array_begin = &array[0];
int *ar         


        

Answer 1

I believe that this is legal, and it depends on the 'lvalue to rvalue' conversion taking place. The last line Core issue 232 has the following:

We agreed that the approach in the standard seems okay: p = 0; *p; is not inherently an error. An lvalue-to-rvalue conversion would give it undefined behavior

Although this is slightly different example, what it does show is that the '*' does not result in lvalue to rvalue conversion and so, given that the expression is the immediate operand of '&' which expects an lvalue then the behaviour is defined.