empty.h

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#ifndef EDAX_EMPTY_H
#define EDAX_EMPTY_H
 
typedef struct SquareList {
        unsigned long long b;         
        int x;                        
        int quadrant;                 
        struct SquareList *previous;  
        struct SquareList *next;      
} SquareList;
 
static inline void empty_remove(SquareList *empty)
{
        empty->previous->next = empty->next;
        empty->next->previous = empty->previous;
}
 
static inline void empty_restore(SquareList *empty)
{
        empty->previous->next = empty;
        empty->next->previous = empty;
}
 
#define foreach_empty(empty, list)\
        for ((empty) = (list)->next; (empty)->next; (empty) = (empty)->next)
 
#define foreach_even_empty(empty, list, parity)\
        for ((empty) = (list)->next; (empty)->next; (empty) = (empty)->next) if ((parity & empty->quadrant) == 0)
 
#define foreach_odd_empty(empty, list, parity)\
        for ((empty) = (list)->next; (empty)->next; (empty) = (empty)->next) if (parity & empty->quadrant)
 
#endif