#ifndef DATUM_H_INCLUDED
#define DATUM_H_INCLUDED

#include <iostream>
#include <iterator>
#include <vector>

template <typename T>
struct Datum
{
  double x, y,;
  T value;
  Datum( double a, double b, T v ) : x( a ), y( b ), value( v ) {}
};

template <typename T>
bool operator< ( const Datum<T> &d1, const Datum<T> &d2 )
{
  return d1.value < d2.value;
}

template <typename T>
bool operator== ( const Datum<T> &d1, const Datum<T> &d2 )
{
  return d1.x == d2.x && d1.y == d2.y && d1.value < d2.value;
}

typedef Datum<int> IntDatum;
typedef std::vector<IntDatum> IntData;
typedef std::back_insert_iterator< IntData > IntInserter;


#endif // DATUM_H_INCLUDED