/* Ways to sort a population. */
#define NO_SORT                    -1
#define BY_FITNESS                  0
#define BY_GENOME                   1
#define BY_FITNESS_THEN_BY_GENOME   2
#define BY_GENOME_THEN_BY_FITNESS   3

extern VOID sort_population();

/*
 * This is to help people out with most of the machinations of crossing over
 * a whole population. You pass it a function to call to do the actual 
 * crossover - it just selects parents and children etc. and calls your
 * function as many times as need be. See busy_beavers/busy_beavers.c and
 * crossover.c for more info.
 */
extern VOID general_crossover();

extern UNSIGNED chars_to_int();
extern VOID int_to_chars();
extern VOID to_gray();
extern VOID from_degray();