init

pg_include/optimizer/geqo_random.h

@@ -0,0 +1,41 @@
+/*-------------------------------------------------------------------------
+ *
+ * geqo_random.h
+ *	  random number generator
+ *
+ * Portions Copyright (c) 1996-2012, 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 */