utility.hpp

#ifndef __window_array_hpp__
#define __window_array_hpp__

#include <iterator>
#include <utility>


template <typename Iterator>
class ipair {
public:

  typedef Iterator                                              iterator_type;
  typedef typename std::iterator_traits<Iterator>::reference    reference;
  
  // constructors
  ipair() {};
  ipair(Iterator i1, Iterator i2)                        : begin(i1), end(i2) {}
  template<typename T> ipair(const std::pair<T, T>& p)   : begin(p.first), end(p.second) {};
  template<typename T> ipair(const ipair<T>& p)          : begin(p.begin), end(p.end) {};


  // operators
  operator std::pair<Iterator, Iterator>()               { return std::make_pair(begin, end); }


  // methods
  reference        operator[](size_t ndx) const          { Iterator i=begin; std::advance(i, ndx); return *i; }
  size_t           size() const                          { return std::distance(begin, end); }
  bool             empty() const                         { return begin==end; }

  Iterator begin;
  Iterator end;  
}; 




#endif  // __window_array_hpp__