C++ (lazy vs eager)

As practice of the concept of lazy vs. eager, and of string implementations, make two simple C++ string classes. Internally, they should store an pointer to char or an array of characters as the internal C-type null terminated string, and a signed integer indicating the length. Write methods for string assignment, overload the < operator to compare two strings against one another, and write a length() method that returns the length. The two string classes are: * EagerString: will set the length of the string immediately, so that when you call length, you simply return the length * LazyString: on assignment, will set the length of the string to -1. If length() is eventually called, then it will do the work. Namely, it will check if it is negative 1, in which case it needs to do work, or if it is some other value, in which case it can return that value. The work involved in calculated the length of the string is a loop counting until you reach the null character of the string. Once you calculate that, assign it to the internal length variable so that you don't need to call it again.