Heap vs Stack allocation

Question

I am alittle bit confused on topic of allocating objects on heap vs allocating on stack, and when and how delete() should be called.

For example I have class Vector.

Answer 1

General rule:

• when you use new or new [], you allocate on heap, in other case you allocate on stack.

• every time you use new you should use delete (explicitly or not)

• every time you use new[] you should use delete[] (explicitly or not)

The next code is UB since you use one new[] and 101 delete. Use one delete[].

Vector** v = new Vector*[100];
for (int i = 0; i < 100; ++i)
{
   delete(v[i]);
}
delete(v);