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/*------------------------------------------------------------------------- * * geqo_random.h * random number generator * * Portions Copyright (c) 1996-2016, 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 */