src/include/optimizer/geqo_random.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * geqo_random.h
   4  *        random number generator
   5  *
   6  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * $PostgreSQL$
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13
  14 /* contributed by:
  15    =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
  16    *  Martin Utesch                              * Institute of Automatic Control          *
  17    =                                                     = University of Mining and Technology =
  18    *  utesch@aut.tu-freiberg.de  * Freiberg, Germany                               *
  19    =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
  20  */
  21
  22 /* -- parts of this are adapted from D. Whitley's Genitor algorithm -- */
  23
  24 #ifndef GEQO_RANDOM_H
  25 #define GEQO_RANDOM_H
  26
  27 #include <math.h>
  28
  29 /* geqo_rand returns a random float value between 0 and 1 inclusive */
  30
  31 #define geqo_rand() ((double) random() / (double) MAX_RANDOM_VALUE)
  32
  33 /* geqo_randint returns integer value between lower and upper inclusive */
  34
  35 #define geqo_randint(upper,lower) \
  36         ( (int) floor( geqo_rand()*(((upper)-(lower))+0.999999) ) + (lower) )
  37
  38 #endif   /* GEQO_RANDOM_H */