Use `unique_ptr` or `shared_ptr` to avoid forgetting to `delete` objects created using `new`

Reason

Avoid resource leaks.

Example

void use(int i)
{
    auto p = new int {7};           // bad: initialize local pointers with new
    auto q = make_unique<int>(9);   // ok: guarantee the release of the memory-allocated for 9
    if (0 < i) return;              // maybe return and leak
    delete p;                       // too late
}

Enforcement

• Flag initialization of a naked pointer with the result of a new
• Flag delete of local variable