////   This file contains the C++ code from Program 12.5 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_05.cpp//bool operator == (SetAsArray const& s, SetAsArray const& t){    if (s.universeSize != t.universeSize)	throw invalid_argument ("mismatched sets");    for (unsigned int item = 0; item < s.universeSize; ++item)	if (s.array [item] != t.array [item])	    return false;    return true;}bool operator <= (SetAsArray const& s, SetAsArray const& t){    if (s.universeSize != t.universeSize)	throw invalid_argument ("mismatched sets");    for (unsigned int item = 0; item < s.universeSize; ++item)	if (s.array [item] && !t.array [item])	    return false;    return true;}