////   This file contains the C++ code from Program 12.6 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm12_06.cpp//class SetAsBitVector : public Set{    typedef unsigned int Word;    enum { wordBits = bitsizeof (Word) };    Array<Word> vector;public:    SetAsBitVector (unsigned int);    // ...};