//
//   This file contains the C# code from Program 5.8 of
//   "Data Structures and Algorithms
//    with Object-Oriented Design Patterns in C#"
//   by Bruno R. Preiss.
//
//   Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng.  All rights reserved.
//
//   http://www.brpreiss.com/books/opus6/programs/pgm05_08.txt
//
public abstract class ComparableObject : IComparable
{
    public static implicit operator ComparableObject(char c)
	{ return new ComparableChar(c); }
    
    public static explicit operator char(ComparableObject c)
	{ return (char)((ComparableChar)c); }
    
    public static implicit operator ComparableObject(int i)
	{ return new ComparableInt32(i); }
    
    public static explicit operator int(ComparableObject c)
	{ return (int)((ComparableInt32)c); }
    
    public static implicit operator ComparableObject(double d)
	{ return new ComparableDouble(d); }
    
    public static explicit operator double(ComparableObject c)
	{ return (double)((ComparableDouble)c); }
    
    public static implicit operator ComparableObject(string s)
	{ return new ComparableString(s); }
    
    public static explicit operator string(ComparableObject c)
	{ return (string)((ComparableString)c); }
    // ...
}