Re: [boost] cycle_iterator

From: nbecker_at_[hidden]
Date: 2002-02-18 09:55:50

I'd like to see something like this added as well:

------------ring.hpp
#ifndef RING_HPP
#define RING_HPP

#include "cycle_iterator.hpp"

template<class Container>
class Ring {
public:
  typedef typename Container::value_type value_type;

  Ring (int size) :
    c (size),
    i (boost::make_cycle_iterator (c.begin(), c.end()))
    {}

  void Advance (int d) {
    i += d;
  }

  value_type& operator[] (int offset) {
    return *(i+offset);
  }
  
  const value_type& operator[] (int offset) const {
    return *(i+offset);
  }
  
private:

  Container c;

  boost::cycle_iterator_generator<typename Container::iterator>::type i;
};

-------TestRing.cc
#include "ring.hpp"
#include <vector>
#include <iostream>

int main() {
  Ring<std::vector<int> > r (10);

  for (int i = 0; i < 10; i++)
    r[i] = i;

  r.Advance (-1);

  for (int i = 0; i < 10; i++)
    std::cout << r[i] << ' ' ;
  std::cout << '\n';

  r.Advance (2);
  for (int i = 0; i < 10; i++)
    std::cout << r[i] << ' ' ;
  std::cout << '\n';
}

#endif