3. (The Smart Pointer std::auto_ptr)

This pointer type is deprecated in C++11. Consider the following code:

using std::auto_ptr;

// Define auto_ptr pointers instead of raw pointers std::auto_ptr d(new double (1.0));.

// Dereference *d = 2.0;
// Change ownership of auto_ptr // (after assignment, d is undefined)
auto_ptr d2 = d;
*d2 = 3.0;
cout << "Auto values: " << *d.get() << ", " << *d2.get();
Answer the following questions:

a) Type the above code and run it. Why does it give a run-time error?

b) Port the code to code that uses std::unique_ptr. Run and test the new code.