Using num_strings

• Keeps track of any initializations of objects from class StringBad. (++ in constructor, -- in destructor)

• Practice: vegnews.cpp in prata

• Problems:

  • callme1(StringBad &); // pass by ref (works)
  • callme2(StringBad); // pass by value (doesn't!!)

• This is running into more constructors than we explicitly defined.