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indexing
	description: "Tables whose keys are integers in a contiguous interval"
	status: "See notice at end of class"
	names: indexable, access
	access: index, membership
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

deferred class 
	INDEXABLE [G, H -> INTEGER]

inherit
	TABLE [G, H]
		rename
			valid_key as valid_index
		redefine
			put,
			valid_index
		end

feature -- Measurement

	index_set: INTEGER_INTERVAL is
			-- Range of acceptable indexes
		deferred
		ensure
			not_void: Result /= void
		end
	
feature -- Status report

	valid_index (i: H): BOOLEAN is
			-- Is i a valid index?
		deferred
		ensure then
			only_if_in_index_set: Result implies ((i >= index_set.lower) and (i <= index_set.upper))
		end
	
feature -- Element change

	put (v: G; k: H) is
			-- Associate value v with key k.
		deferred
		ensure then
			insertion_done: item (k) = v
		end
	
invariant

	index_set_not_void: index_set /= void

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 INDEXABLE


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