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note
	description: "[
		Finite sequences: structures where existing items are arranged
		and accessed sequentially, and new ones can be added at the end.
	]"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: sequence
	access: cursor, membership
	contents: generic
	date: "$Date: 2012-07-23 14:02:19 -0700 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

deferred class 
	SEQUENCE [G]

inherit
	ACTIVE [G]
		redefine
			prune_all
		end

	BILINEAR [G]

	FINITE [G]

feature -- Status report

	readable: BOOLEAN
			-- Is there a current item that may be read?
		do
			Result := not off
		end

	writable: BOOLEAN
			-- Is there a current item that may be modified?
		do
			Result := not off
		end
	
feature -- Element change

	force (v: like item)
			-- Add `v' to end.
		require
			extendible: extendible
		do
			extend (v)
		ensure then
			new_count: count = old count + 1
			item_inserted: has (v)
		end

	append (s: SEQUENCE [G])
			-- Append a copy of `s'.
		require
			argument_not_void: s /= Void
		local
			l: like s
		do
			l := s
			if s = Current then
				l := twin
			end
			from
				l.start
			until
				l.exhausted
			loop
				extend (l.item)
				l.forth
			end
		ensure
			new_count: count >= old count
		end

	put (v: like item)
			-- Add `v' to end.
		do
			extend (v)
		ensure then
			new_count: count = old count + 1
		end
	
feature -- Removal

	prune (v: like item)
			-- Remove the first occurrence of `v' if any.
			-- If no such occurrence go off.
		do
			start
			search (v)
			if not exhausted then
				remove
			end
		end

	prune_all (v: like item)
			-- Remove all occurrences of `v'; go off.
		do
			from
				start
			until
				exhausted
			loop
				search (v)
				if not exhausted then
					remove
				end
			end
		end
	
note
	copyright: "Copyright (c) 1984-2012, 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 SEQUENCE


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