#ifndef INTERVALSET_H_
#define INTERVALSET_H_

#include <stddef.h>
#include <vector>

class IntervalSet {
  typedef int key_t; // TODO?! template <typename T>
  typedef std::pair<key_t,key_t> value_t;
  typedef std::vector<value_t> data_t;
 public:
  static const key_t npos;

  void clear();
  // [start;end) !
  void add(key_t start,key_t end=npos);
  void finish();

  size_t size() const { return data.size(); }

  // only after finish() has been called:
  bool contains(key_t val) const;
  key_t next(key_t val) const;

  void dump() const;
 private:
  // currently not used
  bool intersect(const value_t &a,const value_t &b) const;
  void unite(value_t &aret,const value_t &b) const;
 private:
  data_t data;
};

#endif