C++ new int[0] — will it allocate memory?

Question

A simple test app:

cout << new int[0] << endl;

outputs:

0x876c0b8

So it looks like it works.

Answer 1

What does the standard say about this? Is it always legal to "allocate" empty block of memory?

Every object has a unique identity, i.e. a unique address, which implies a non-zero length (the actual amount of memory will be silently increased, if you ask for zero bytes).

If you allocated more than one of these objects then you'd find they have different addresses.