Can the argument of delete[] operator point to non-first element of an array?

Question

The question is as above; if I have, for example, int* ptr = new int[10] and after some operations with data ptr is set to, say, 2nd, 3rd 5th or last element, will the call delete[] ptr be the correct one? Can't find it in the manual.

Answer 1

No, the argument passed to the delete[] operator must point to the same address that was returned by new[]

(Assuming you haven't overloaded delete[] and new[] to do something crazy)

Answer 2

From the C++ reference manual delete[]: Notice that an invalid value of ptr causes undefined behaviour.
Because of this it is not recommended to manipulate the pointer to your allocated memory directly!

Answer 3

Can't find it in the manual

C++11 3.7.4.2/3 says

behavior is undefined if the value supplied to operator delete[](void*) in the standard library is not one of the values returned by a previous invocation of either operator new[](std::size_t) or operator new[](std::size_t, const std::nothrow_t&) in the standard library