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indexing
	description: "[
		Values that may be hashed into an integer index, 
		for use as keys in hash tables
	]"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

deferred class 
	HASHABLE

feature -- Access

	hash_code: INTEGER is
			-- Hash code value
		deferred
		ensure
			good_hash_value: Result >= 0
		end
	
feature -- Status report

	is_hashable: BOOLEAN is
			-- May current object be hashed?
			-- (True if it is not its type's default.)
		do
			Result := (Current /= default)
		ensure
			ok_if_not_default: Result implies (Current /= default)
		end
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

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 HASHABLE


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