note
	description: "[
		Objects representing delayed calls to a function,
		with some arguments possibly still open.
		
		Note: Features are the same as those of ROUTINE,
			with apply made effective, and the addition
			of last_result and item.
	]"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2017-06-01 07:24:49 +0000 (Thu, 01 Jun 2017) $"
	revision: "$Revision: 100440 $"

class interface
	FUNCTION [OPEN_ARGS -> detachable TUPLE create default_create end, RESULT_TYPE]

create {NONE}
	set_rout_disp,
	set_rout_disp_final

feature -- Access

	last_result: detachable RESULT_TYPE
			-- Result of last call, if any

	call (args: detachable separate OPEN_ARGS)
			-- Call routine with args.

	item alias "()" (args: detachable separate OPEN_ARGS): RESULT_TYPE
			-- Result of calling function with args as operands.
		require
			valid_operands: valid_operands (args)

	apply
			-- Call function with operands as last set.
	
feature -- Comparison

	is_equal (other: like Current): BOOLEAN
			-- Is associated function the same as the one
			-- associated with other?
	
feature -- Duplication

	copy (other: like Current)
			-- Use same function as other.
	
feature -- Removal

	clear_last_result
			-- Reset content of last_result to its default value.
	
feature -- Extended operations

	flexible_item (a: detachable separate TUPLE): RESULT_TYPE
			-- Result of calling function with a as arguments.
			-- Compared to item the type of a may be different from {OPEN_ARGS}.
		require
			valid_operands: valid_operands (a)
	
note
	copyright: "Copyright (c) 1984-2017, 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 FUNCTION

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