#ifndef _MYRAND_H
#define _MYRAND_H

#include <limits.h>                     // for INT_MAX

// designed for implementation independent randomization
// if all system dependent calls included in this class, then
// other classes can make use of this class in independent manner
//
// RandGen() ---      constructor sets seed of random # generator
//                    once per program, not per class/object
//     
// RandInt(int)
// RandInt(int,int) - return random integer in range [0..max) when one
//                    parameter used, [low..max] when two parameters used
//
//       examples:    rnd.RandInt(6) is random integer [0..5] or [0..6)
//                    rnd.RandInt(3,10) is random integer [3..10]
//                    rnd.RandInt()  is random integer [0..INT_MAX)
//
// RandReal()       -- returns random double in range [0..1)

class RandGen
{
  public:
    RandGen();                          // set seed for all instances
    int RandInt(int max = INT_MAX);     // returns int in [0..max)
    int RandInt(int low, int max);      // returns int in [low..max]
    double RandReal();                  // returns double in [0..1)    
  private:
    static int initialized;             // for 'per-class' initialization
};

#endif    /* _MYRAND_H not defined */