What happens if delete[] p fails?

Question

Suppose I have a pointer to a dynamically allocated array of 10 elements:

T* p = new T[10];

Later, I want to release that array:

Answer 1

To answer your second question, if you used std::vector instead, there wouldn't be any need for a call to delete, you're not using pointers (the vector class is internally I believe, but this is not up to you to manage).