note
	description: "Absolute temporal values"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2018-12-18 10:46:58 +0000 (Tue, 18 Dec 2018) $"
	revision: "$Revision: 102623 $"
	access: date, time

deferred class interface
	ABSOLUTE

feature -- Access

	origin: like Current
			-- Place of start for recording objects.
		ensure
			result_exists: Result /= Void
	
feature -- Measurement

	duration: DURATION
			-- Length of the interval of time since origin.
	
feature -- Comparison

	is_less alias "<" (other: like Current): BOOLEAN
			-- Is the current object before other?
	
feature -- Basic operations

	minus alias "-" (other: like Current): INTERVAL [like Current]
			-- Interval between current object and other.
		require
			other_exists: other /= Void
			other_smaller_than_current: other <= Current
		ensure
			result_exists: Result /= Void
			result_set: Result.start_bound.is_equal (other) and then Result.end_bound.is_equal (Current)

	relative_duration (other: like Current): DURATION
			-- Relative duration from Current to other.
		require
			other_exists: other /= Void
		ensure
			result_exists: Result /= Void
	
note
	copyright: "Copyright (c) 1984-2018, 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 ABSOLUTE

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