note
	description: "[
		Collections of items, where each item may occur zero
		or more times, and the number of occurrences is meaningful.
	]"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: bag, access
	access: membership
	contents: generic
	date: "$Date: 2012-07-23 21:02:19 +0000 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

deferred class 
	BAG [G]

inherit
	COLLECTION [G]
		redefine
			extend
		end

feature -- Measurement

	occurrences (v: G): INTEGER_32
			-- Number of times v appears in structure
			-- (Reference or object equality,
			-- based on object_comparison.)
		deferred
		ensure
			non_negative_occurrences: Result >= 0
		end
	
feature -- Element change

	extend (v: G)
			-- Add a new occurrence of v.
		deferred
		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 BAG

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