Can't Delete Class Pointer

Question

Class Example
{
    // ...
};

int main()
{
    Example** pointer = new Example*[9];

    for(int i = 0; i < 10; i++)
    {
        pointer[i] = new Example();
    }

    for(int i = 0; i < 10; i++)
    {
        delete pointer[i];
    }

    delete[] pointer; // <--- This is problem
    pointer = nullptr;
}

I'm trying to hold object's adresses in arrays. When I'm trying to delete them, for loop working great but delete[] pointer causes "wrote to memory end of heap buffer" error. What am I doing wrong? Should'nt I delete that too?

Answer 1

Your array is too small:

Example** pointer = new Example*[9];

You are allocating for 9 elements, meaning their indices are 0,1,2,...,8.

In the loops here:

 pointer[i] = new Example();

and here:

 delete pointer[i];

you are accessing pointer[9] because your loop condition is i < 10. This is out-of-bounds and accessing the value causes undefined behavior.

Instead create an array with 10 elements:

Example** pointer = new Example*[10];