////   This file contains the C++ code from Program 12.11 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_11.cpp//MultisetAsArray::MultisetAsArray (unsigned int n) :    Multiset (n),    array (n){    for (unsigned int item = 0; item < universeSize; ++item)	array [item] = 0;}void MultisetAsArray::Insert (Object& object){    unsigned int const item = dynamic_cast<Element&> (object);    ++array [item];}void MultisetAsArray::Withdraw (Object& object){    unsigned int const item = dynamic_cast<Element&> (object);    if (array [item] > 0)	--array [item];}bool MultisetAsArray::IsMember (Object const& object) const{    unsigned int const item =	dynamic_cast<Element const&> (object);    return array [item] > 0;}