#ifndef Date_OS_SEEN
#define Date_OS_SEEN
///////    File dDate_OS.h    ///////
#include "Date.h"
#include "OrderedSeq.h"

class Date_OS : public OrderedSeq
{ public:
    Date_OS()
    : len(0), max(0), dates(NULL) { }     // default constructor
    Uint length() { return(len); }          // current length of seq
    Date* operator[](Uint i);                // overloading []
    void remove(Uint i);                    // remove by index
    ~Date_OS() { delete [] dates; }
  protected:
    int  append(void* date);         // add any at end, -1 failed
  private:
    void swap(Uint i, Uint j);      // interchange elements
    int  cmp(Uint i, Uint j);       // compare elements
    int  cmp(void* date, Uint j);    // compare key to element
    int increase();             // lengthen pointer array
    enum {Inc=4};
    Date** dates;              // dynamic pointer array
    Uint    len;                   // total no. of dates
    Uint    max;                   // current limit len
};

inline void Date_OS::swap(Uint i, Uint j)
       {  Date* tmp = dates[i];
          dates[i]  = dates[j];
          dates[j]  = tmp;
       }

inline int Date_OS::cmp(Uint i, Uint j)
       {  return dates[i]->cmp(*dates[j]); }

inline int Date_OS::cmp(void* date, Uint j)
       {  Date* tmp = (Date*) date;
          return tmp->cmp(*dates[j]);
       }
#endif