/*
 * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
 * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
 * copyright and warranty notices given in that book:
 * 
 * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
 * 
 * 
 * "The authors and publisher have taken care in the preparation of this book,
 * but make no expressed or implied warranty of any kind and assume no
 * responsibility for errors or omissions. No liability is assumed for
 * incidental or consequential damages in connection with or arising out of the
 * use of the information or programs contained herein."
 * 
 * Permission is granted for this code to be used for educational purposes in
 * association with the book, given proper citation if and when posted or
 * reproduced.Any commercial use of this code requires the explicit written
 * permission of the publisher, Addison-Wesley Professional, a division of
 * Pearson Education, Inc. Send your request for permission, stating clearly
 * what code you would like to use, and in what specific way, to the following
 * address: 
 * 
 * 	Pearson Education, Inc.
 * 	Rights and Contracts Department
 * 	75 Arlington Street, Suite 300
 * 	Boston, MA 02216
 * 	Fax: (617) 848-7047
*/ 

#include <cstddef>

class CheckedPtr {
public:
    // no default constructor; CheckedPtrs must be bound to an object
    CheckedPtr(int *b, int *e): beg(b), end(e), curr(b) { }

    // dereference and increment operations

    // dereference operator
    int& operator*();
    const int& operator*() const;

    // increment and decrement
    CheckedPtr operator++(int);     // postfix operators
    CheckedPtr operator--(int);
    // other members as before

    CheckedPtr& operator++();       // prefix operators
    CheckedPtr& operator--();
    // other members as before
private:
    int* beg;    // pointer to beginning of the array
    int* end;    // one past the end of the array
    int* curr;   // current position within the array
};