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note
	description: "[
		Data structures of the most general kind,
		used to hold zero or more items.
	]"
	library: "Free implementation of ELKS library"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	names: access
	access: membership
	contents: generic
	date: "$Date: 2012-07-23 14:02:19 -0700 (Mon, 23 Jul 2012) $"
	revision: "$Revision: 91989 $"

deferred class 
	CONTAINER [G]

feature -- Access

	has (v: G): BOOLEAN
			-- Does structure include `v'?
			-- (Reference or object equality,
			-- based on object_comparison.)
		deferred
		ensure
			not_found_in_empty: Result implies not is_empty
		end
	
feature -- Status report

	is_empty: BOOLEAN
			-- Is there no element?
		deferred
		end

	empty: BOOLEAN
		obsolete "ELKS 2000: Use `is_empty' instead"
			-- Is there no element?
		do
			Result := is_empty
		end

	object_comparison: BOOLEAN
			-- Must search operations use equal rather than `='
			-- for comparing references? (Default: no, use `='.)

	changeable_comparison_criterion: BOOLEAN
			-- May object_comparison be changed?
			-- (Answer: yes by default.)
		do
			Result := True
		end
	
feature -- Status setting

	compare_objects
			-- Ensure that future search operations will use equal
			-- rather than `=' for comparing references.
		require
			changeable_comparison_criterion: changeable_comparison_criterion
		do
			object_comparison := True
		ensure
				object_comparison
		end

	compare_references
			-- Ensure that future search operations will use `='
			-- rather than equal for comparing references.
		require
			changeable_comparison_criterion: changeable_comparison_criterion
		do
			object_comparison := False
		ensure
			reference_comparison: not object_comparison
		end
	
feature -- Conversion

	linear_representation: LINEAR [G]
			-- Representation as a linear structure
		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 CONTAINER


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