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indexing
	description: "Unbounded queues implemented as linked lists"
	status: "See notice at end of class"
	names: linked_queue, dispenser, linked_list
	representation: linked
	access: fixed, fifo, membership
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class interface
	LINKED_QUEUE [G]

create 
	make

feature -- Initialization

	make
			-- Create linked queue.
	
feature -- Access

	item: G
			-- Oldest item
		ensure then
			last_element_if_not_empty: not is_empty implies (active = last_element)
	
feature -- Element change

	put (v: G)
			-- Add v as newest item.
			-- Was declared in LINKED_QUEUE as synonym of extend and force.
		ensure then
			single_item_constraint: (old is_empty) implies (item = v)

	extend (v: G)
			-- Add v as newest item.
			-- Was declared in LINKED_QUEUE as synonym of put and force.
		ensure then
			single_item_constraint: (old is_empty) implies (item = v)

	force (v: G)
			-- Add v as newest item.
			-- Was declared in LINKED_QUEUE as synonym of put and extend.
		ensure then
			single_item_constraint: (old is_empty) implies (item = v)
	
feature -- Conversion

	linear_representation: ARRAYED_LIST [G]
			-- Representation as a linear structure
			-- (order is same as original order of insertion)
	
feature -- Duplication

	duplicate (n: INTEGER): like Current
			-- New queue containing the n oldest items in current queue.
			-- If n is greater than count, identical to current queue.
	
invariant

	is_always_after: not is_empty implies after

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class LINKED_QUEUE


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