Viewing file:  geqo_random.h (1.29 KB) -rw-r--r--
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/*-------------------------------------------------------------------------
*
* geqo_random.h
* random number generator
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/optimizer/geqo_random.h
*
*-------------------------------------------------------------------------
*/
/* contributed by:
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
* Martin Utesch * Institute of Automatic Control *
= = University of Mining and Technology =
* utesch@aut.tu-freiberg.de * Freiberg, Germany *
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
*/
/* -- parts of this are adapted from D. Whitley's Genitor algorithm -- */
#ifndef GEQO_RANDOM_H
#define GEQO_RANDOM_H
#include <math.h>
#include "optimizer/geqo.h"
extern void geqo_set_seed(PlannerInfo *root, double seed);
/* geqo_rand returns a random float value between 0 and 1 inclusive */
extern double geqo_rand(PlannerInfo *root);
/* geqo_randint returns integer value between lower and upper inclusive */
#define geqo_randint(root, upper, lower) \
( (int) floor( geqo_rand(root)*(((upper)-(lower))+0.999999) ) + (lower) )
#endif /* GEQO_RANDOM_H */
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