#ifndef ITEM_H
#define ITEM_H

		/* type defined, but internal representation hidden */
typedef struct Item_t Item;

Item *
makeItem( double data );

void
linkItem( Item * item, Item * other );

void
printItems( const Item * first );

void
freeItems( Item * first );

typedef void (*ItemAction)( const Item * );

void
doActionToItems( const Item * first, ItemAction action );

#endif