note
	description: "Summary description for {PLUSONE}."
	author: ""
	date: "$Date$"
	revision: "$Revision$"

class 
	PLUS_ONE

create 
	make

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end
	
feature -- Access

	generating_type: TYPE [detachable PLUS_ONE]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal (other: PLUS_ONE): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: PLUS_ONE): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal (other: PLUS_ONE): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature -- Status report

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: PLUS_ONE)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: PLUS_ONE)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: PLUS_ONE
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: PLUS_ONE)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: PLUS_ONE
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: PLUS_ONE
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached PLUS_ONE
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable PLUS_ONE
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature {NONE} 

	make (an_array: like a)
		do
			a := an_array
		end
	
feature 

	a: ARRAY [INTEGER_32]
			-- the array to be converted and incremented
			-- e.g. for <<8, 7, 4>> output 875

	term (n: INTEGER_32; i: INTEGER_32; a_digit: INTEGER_32): INTEGER_32
			-- n: is the array count
			-- i: is the array index
			-- a_digit: is the array element
		do
			Result := a_digit * (10 ^ (n - i).to_double).truncated_to_integer
		end

	val: INTEGER_32
			-- e.g. for array <<8, 7, 4>>,
			-- Result = (8*10^2 + 7*10^1 + 4*10^0) + 1
		require
				a.count >= 1
				across
					a as cr
				all
					0 <= cr.item and cr.item <= 9
				end
		local
			n, i, factor: INTEGER_32
		do
			from
				i := 1
				n := a.count
			until
				i > n
			loop
				check
						n - i >= 0
				end
				factor := (10 ^ (n - i).to_double).truncated_to_integer
				Result := Result + a [i] * factor
				i := i + 1
			end
			Result := Result + 1
		ensure
				Result = {ITERABLE_ARITHMETIC [INTEGER_32]}.sum_array (a, agent term (?, ?, ?))
-- Unable to show all postconditions!
end
			
		feature -- Output
		
			Io: STD_FILES
					-- Handle to standard file setup
					-- (from ANY)
				once
					create Result
					Result.set_output_default
				ensure -- from ANY
					instance_free: class
					io_not_void: Result /= Void
				end

			out: STRING_8
					-- New string containing terse printable representation
					-- of current object
					-- (from ANY)
				do
					Result := tagged_out
				ensure -- from ANY
					out_not_void: Result /= Void
				end

			print (o: detachable ANY)
					-- Write terse external representation of o
					-- on standard output.
					-- (from ANY)
				do
					if o /= Void then
						Io.put_string (o.out)
					end
				ensure -- from ANY
					instance_free: class
				end

			frozen tagged_out: STRING_8
					-- New string containing terse printable representation
					-- of current object
					-- (from ANY)
				external
					"built_in"
				ensure -- from ANY
					tagged_out_not_void: Result /= Void
				end
			
		feature -- Platform
		
			Operating_environment: OPERATING_ENVIRONMENT
					-- Objects available from the operating system
					-- (from ANY)
				once
					create Result
				ensure -- from ANY
					instance_free: class
					operating_environment_not_void: Result /= Void
				end
			
		feature {NONE} -- Retrieval
		
			frozen internal_correct_mismatch
					-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
					-- from MISMATCH_CORRECTOR.
					-- (from ANY)
				local
					l_msg: STRING_8
					l_exc: EXCEPTIONS
				do
					if attached {MISMATCH_CORRECTOR} Current as l_corrector then
						l_corrector.correct_mismatch
					else
						create l_msg.make_from_string ("Mismatch: ")
						create l_exc
						l_msg.append (generating_type.name)
						l_exc.raise_retrieval_exception (l_msg)
					end
				end
			
		invariant
				-- from ANY
			reflexive_equality: standard_is_equal (Current)
			reflexive_conformance: conforms_to (Current)

		end -- class PLUS_ONE

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