//--------------------------------------------------------------------------------------------------------------------
// Header for the definition of a "flexible" vector whose size is dynamic and default entries are zeroes.
//--------------------------------------------------------------------------------------------------------------------
#include <list>						// list class and operations.
using std::list;

const char  FETCH   = '?';				// Determines value set to subscript for vector.
const char  ASSIGN  = '=';				// Sets subscript value to input value for vector.
const char  STATUS  = 's';				// Returns status of specified vector
const char  COMMENT = '*';				// Comment -- rest of line ignored.
const int   MAXC    =  5;				// Maximum # of arguments in command+1.
const int   MAXV    =  3;				// Maximum # of vectors in program.

class Pair {
    int    key;						// Key for the record pair.
    int    value;					// Associated integer value.
  public:
    Pair(int k, int v) {
	key   = k;
	value = v;
    }
    Pair() : key(0), value(0) {}
    int   getKey()   {return key;};			// Return the subscript.
    int & getValue() {return value;};			// Return the value associated with key.
};


class FlexVec {
  private:
    list<Pair> vlist;					// List to contain information.
  public:
    ~FlexVec();
    int & operator[ ](int subscript);			// Overloaded subscripting operator.
  
    // Returns the number of non-zero entries, and the range of indices that contain non-zero values.
    void Status(int &numEntries, int &minIndex, int &maxIndex);
}; // FlexVec