geqo_recombination.h

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/*-------------------------------------------------------------------------
 *
 * geqo_recombination.h
 *    prototypes for recombination in the genetic query optimizer
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/geqo_recombination.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_RECOMBINATION_H
#define GEQO_RECOMBINATION_H
 
#include "optimizer/geqo.h"
 
 
extern void init_tour(PlannerInfo *root, Gene *tour, int num_gene);
 
 
/* edge recombination crossover [ERX] */
 
typedef struct Edge
{
    Gene        edge_list[4];   /* list of edges */
    int         total_edges;
    int         unused_edges;
} Edge;
 
extern Edge *alloc_edge_table(PlannerInfo *root, int num_gene);
extern void free_edge_table(PlannerInfo *root, Edge *edge_table);
 
extern float gimme_edge_table(PlannerInfo *root, Gene *tour1, Gene *tour2,
                              int num_gene, Edge *edge_table);
 
extern int  gimme_tour(PlannerInfo *root, Edge *edge_table, Gene *new_gene,
                       int num_gene);
 
 
/* partially matched crossover [PMX] */
 
#define DAD 1                   /* indicator for gene from dad */
#define MOM 0                   /* indicator for gene from mom */
 
extern void pmx(PlannerInfo *root,
                Gene *tour1, Gene *tour2,
                Gene *offspring, int num_gene);
 
 
typedef struct City
{
    int         tour2_position;
    int         tour1_position;
    int         used;
    int         select_list;
}           City;
 
extern City * alloc_city_table(PlannerInfo *root, int num_gene);
extern void free_city_table(PlannerInfo *root, City * city_table);
 
/* cycle crossover [CX] */
extern int  cx(PlannerInfo *root, Gene *tour1, Gene *tour2,
               Gene *offspring, int num_gene, City * city_table);
 
/* position crossover [PX] */
extern void px(PlannerInfo *root, Gene *tour1, Gene *tour2, Gene *offspring,
               int num_gene, City * city_table);
 
/* order crossover [OX1] according to Davis */
extern void ox1(PlannerInfo *root, Gene *mom, Gene *dad, Gene *offspring,
                int num_gene, City * city_table);
 
/* order crossover [OX2] according to Syswerda */
extern void ox2(PlannerInfo *root, Gene *mom, Gene *dad, Gene *offspring,
                int num_gene, City * city_table);
 
#endif                          /* GEQO_RECOMBINATION_H */