/*
 * hringir.h
 * Rings (Directed Cyclical Graphs) Class
 * v.1.0
 *
 * Copyright Casady Kemper March 28 2009.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation (where applicable) for any purpose is hereby
 * granted without fee, provided that the above copyright notice appear
 * in all copies and that both that copyright notice and this permission
 * notice appear in supporting documentation.
 *
 */

template <class efni> class ring {
public:
	ring(int len);
	~ring();
	efni &operator[](int n);
	const efni &operator[](int n) const;
	int length;
private:
	efni *index;
};
template <class efni>
ring<efni>::ring(int len){
	index = new efni[len];
	length = len;
}
template <class efni>
ring<efni>::~ring(){
	delete [] index;
}
template <class efni>
efni &ring<efni>::operator[](int n) {
	n%=length;
	if(n<0){
		n+=length;
	}
	return index[n];
}
template <class efni>
const efni &ring<efni>::operator[](int n) const {
	n%=length;
	if(n<0){
		n+=length;
	}
	return index[n];
}