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indexing
	description: "[
		``Active'' data structures, which at every stage have
		a possibly undefined ``current item''.
		Basic access and modification operations apply to the current item.
	]"
	status: "See notice at end of class"
	names: active, access
	access: membership
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

deferred class 
	ACTIVE [G]

inherit
	BAG [G]

feature -- Access

	item: G is
			-- Current item
		require
			readable: readable
		deferred
		end
	
feature -- Status report

	readable: BOOLEAN is
			-- Is there a current item that may be read?
		deferred
		end

	writable: BOOLEAN is
			-- Is there a current item that may be modified?
		deferred
		end
	
feature -- Element change

	replace (v: G) is
			-- Replace current item by v.
		require
			writable: writable
		deferred
		ensure
			item_replaced: item = v
		end
	
feature -- Removal

	remove is
			-- Remove current item.
		require
			prunable: prunable
			writable: writable
		deferred
		end
	
invariant

	writable_constraint: writable implies readable
	empty_constraint: is_empty implies (not readable) and (not writable)

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 ACTIVE


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