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060213 0831 locators 4 locator based methods locator

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06/02/13 08:31 Locators 4 Locator-based Methods Locator-based priority queue  methods: insert (k, o): inserts the item  (k, o) and returns a locator  for it min (): returns the locator of  an item with smallest key remove (l): remove the item  with locator l replaceKey (l, k): replaces  the key of the item with  locator l replaceElement (l, o):  replaces with o the element  of the item with locator l locators (): returns an iterator  over the locators of the items  in the priority queue Locator-based dictionary  methods: insert (k, o): inserts the item  (k, o) and returns its locator find (k): if the dictionary  contains an item with key k,  returns its locator, else return  a special null locator remove (l): removes the item  with locator l and returns its  element locators (),  replaceKey (l, k),  replaceElement (l, o)
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06/02/13 08:31 Locators 5 Possible Implementation The locator is an  object storing key element
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