#ifndef EXECUTION_SLOT_TRACKER_HPP
#define EXECUTION_SLOT_TRACKER_HPP

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#include <vector>

/* This class is made to track execution slots for the computes nodes. */
class execution_slot_tracker
  {
  std::vector<bool> slots;
  int               open_count;

  public:
    execution_slot_tracker(const execution_slot_tracker& est);
    execution_slot_tracker();
    execution_slot_tracker(const int size);

	execution_slot_tracker& operator= (const execution_slot_tracker& est);


  int get_number_free() const;
  int get_total_execution_slots() const;
  int get_next_occupied_index(int &iterator) const;
  bool is_occupied(int index) const;
	int mark_as_used(int index);
  int mark_as_free(int index);
  void add_execution_slot();
  int unset_subset(const execution_slot_tracker &subset);
  int reserve_execution_slot(int index, execution_slot_tracker &subset);
  int reserve_execution_slots(int num_slots_to_reserve, execution_slot_tracker &subset);
  int unreserve_execution_slots(const execution_slot_tracker &subset);
  int remove_execution_slot();
  };

extern const int  OUT_OF_RANGE;
extern const int  INSUFFICIENT_FREE_EXECUTION_SLOTS;
extern const int  SUBSET_TOO_LARGE;

extern const bool OCCUPIED;
extern const bool FREE;
#endif