Hashtables (not in ISO)

• new_hashtable(T): Create a hashtable T with 7 bucket slots.

• new_hashtable(T,N): Create a hashtable T with N bucket slots. N must be a positive integer.

• is_hashtable(T): This is true when T is a hashtable.

• hashtable_get(T,Key,Value): Get the value Value that is stored under the key Key from hashtable T. Fail if no such key exists.

• hashtable_register(T,Key,Value): Get the value Value that is stored under the key Key from hashtable T. Store the value in the table under Key, if the key does not exist.

• hashtable_size(T,Size): The number of bucket slots in hashtable T is Size.

• hash_code(Term,Code): The hash code of Term is Code.

• hashtable_to_list(T,List): List is the list of key and value pairs in hashtable T.

• hashtable_keys_to_list(T,List): List is the list of keys of the elements in hashtable T.

• hashtable_values_to_list(T,List): List is the list of values of the elements in hashtable T.