WHEN you write a class that uses dynamic allocation 
within its methods, you are EXPECTED to also include
the following three special kinds of methods:

*   destructor
    *   called FOR YOU when your object goes outside of scope

    *   its responsibility is to FREE dynamically-allocated memory
	(and sometimes other clean-up)

    *   a class has ONLY one destructor,
	its name is ~class_name (and no arguments)

*   copy constructor
    *   needed when C++ would make a copy of something --
        say, for a pass-by-value parameter

    *   name is the class name,
        BUT with one parameter: an instance of the class
            passed by reference but passed as a const (so
            it cannot be changed)

*   overloaded assignment operator
    *   what does assignment mean for this particular class?
        
    *   write a method with special name operator =
        with one parameter: a const pass-by-reference element of 
        that class
        and (tradition) have it return a reference to an object
        of that type (so chaining assigmment statements can work)   

*   consider string_list -- a list of strings implemented with the
    help of a dynamically-allocated array as one of its data fields,
    and it has the "big 3" above (a destructor, a copy constructor,
    and an overloaded assignment operator)

*   another C++ syntax note:
    keyword static

    // static: inside of a class definition, it means there
    //    is EXACTLY ONE COPY of that thing no matter
    //    HOW many instances of that class are created

    *   we see an example of this in class string_list, in
        string_list.h -- by making the named constant
	INITIAL_CAP static:

	static const int INITIAL_CAP = 10;

	...now there will be ONLY one instance of
	this named constant, no matter how many (or even
	IF any) instances of the object have been
	created;

    *   it can be used for more than just named constants... 8-)
    
*   (then started a code-reading exercise/example, reading through
    and discussing the string_list class, starting with string_list.h)