ddd

typedef struct skiplistnode_struct{
	void *data;
	struct skiplistnode_struct *forward[1]; /* this must be the last element of the struct,as we allocate # of elements during runtime*/
}skiplistnode;

typedef struct skiplist_struct{
	int current_level;
	int max_levels;
	float level_probability;
	unsigned long items;
	int allow_duplicates;
	int append_duplicates;
	int (*compare_function)(void *,void *);
	skiplistnode *head;
}skiplist;