////   This file contains the C++ code from Program 10.15 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/pgm10_15.cpp//Object& MWayTree::Find (Object const& object) const{    if (IsEmpty ())	return NullObject::Instance ();    unsigned int i = numberOfKeys;    while (i > 0)    {	int const diff = object.Compare (*key [i]);	if (diff == 0)	    return *key [i];	if (diff > 0)	    break;	--i;    }    return subtree [i]->Find (object);}