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note
	description: "Unbounded queues implemented as linked lists"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: linked_queue, dispenser, linked_list
	representation: linked
	access: fixed, fifo, membership
	contents: generic
	date: "$Date: 2014-01-17 11:50:59 -0800 (Fri, 17 Jan 2014) $"
	revision: "$Revision: 94051 $"

class interface
	LINKED_QUEUE [G]

create 
	make


create {LINKED_QUEUE}
	ll_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_32): like Current
			-- New queue containing the `n' oldest items in current queue.
			-- If `n' is greater than count, identical to current queue.

	copy (other: like Current)
			-- Update current object using fields of object attached
			-- to `other', so as to yield equal objects.
	
invariant
	is_always_after: not is_empty implies after

note
	copyright: "Copyright (c) 1984-2014, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class LINKED_QUEUE


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