note
	description: "References to objects containing an integer value coded on 64 bits"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2020-05-19 14:18:09 +0000 (Tue, 19 May 2020) $"
	revision: "$Revision: 104255 $"

class 
	INTEGER_64_REF

create 
	default_create

feature {NONE} -- Initialization

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

	make_from_reference (v: INTEGER_64_REF)
			-- Initialize Current with v.item.
		require
			v_not_void: v /= Void
		do
			set_item (v.item)
		ensure
			item_set: item = v.item
		end
	
feature -- Access

	ascii_char: CHARACTER_8
		obsolete "Use to_character_8 instead. [2017-05-31]"
			-- Returns corresponding ASCII character to item value.
		require
			valid_character_code: is_valid_character_8_code
		do
			Result := item.to_character_8
		end

	generating_type: TYPE [detachable INTEGER_64_REF]
			-- 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

	hash_code: INTEGER_32
			-- Hash code value
		do
			Result := (item & 2147483647).to_integer_32
		ensure -- from HASHABLE
			good_hash_value: Result >= 0
		end

	item: INTEGER_64
			-- Integer value


	Max_value: INTEGER_64 = 9223372036854775807
			-- Minimum and Maximum value hold in item.

	Min_value: INTEGER_64 = -9223372036854775808

	one: like Current
			-- Neutral element for "*" and "/"
		do
			create Result;
			Result.set_item (1)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	sign: INTEGER_32
			-- Sign value (0, -1 or 1)
		do
			if item > 0 then
				Result := 1
			elseif item < 0 then
				Result := -1
			end
		ensure
			three_way: Result = three_way_comparison (zero)
		end

	zero: like Current
			-- Neutral element for "+" and "-"
		do
			create Result;
			Result.set_item (0)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		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 alias "≡≡≡" (other: INTEGER_64_REF): 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: like Current): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object and identical to it?
		require -- from ANY
			other_not_void: other /= Void
		do
			Result := other.item = item
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		ensure then -- from COMPARABLE
			trichotomy: Result = (not (Current < other) and not (other < Current))
		end

	is_greater alias ">" (other: INTEGER_64_REF): BOOLEAN
			-- Is current object greater than other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := other < Current
		ensure then -- from COMPARABLE
			definition: Result = (other < Current)
		end

	is_greater_equal alias ">=" alias "≥" (other: INTEGER_64_REF): BOOLEAN
			-- Is current object greater than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := not (Current < other)
		ensure then -- from COMPARABLE
			definition: Result = (other <= Current)
		end

	is_less alias "<" (other: like Current): BOOLEAN
			-- Is current integer less than other?
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := item < other.item
		ensure then -- from COMPARABLE
			asymmetric: Result implies not (other < Current)
		end

	is_less_equal alias "<=" alias "≤" (other: INTEGER_64_REF): BOOLEAN
			-- Is current object less than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := not (other < Current)
		ensure then -- from COMPARABLE
			definition: Result = ((Current < other) or (Current ~ other))
		end

	max alias "∨" (other: INTEGER_64_REF): INTEGER_64_REF
			-- The greater of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current >= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_smaller: Current >= other implies Result = Current
			other_if_smaller: Current < other implies Result = other
		end

	min alias "∧" (other: INTEGER_64_REF): INTEGER_64_REF
			-- The smaller of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current <= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_greater: Current <= other implies Result = Current
			other_if_greater: Current > other implies Result = other
		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 alias "≜" (other: INTEGER_64_REF): 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

	three_way_comparison alias "⋚" (other: INTEGER_64_REF): INTEGER_32
			-- If current object equal to other, 0;
			-- if smaller, -1; if greater, 1
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current < other then
				Result := -1
			elseif other < Current then
				Result := 1
			end
		ensure -- from COMPARABLE
			equal_zero: (Result = 0) = (Current ~ other)
			smaller_negative: (Result = -1) = (Current < other)
			greater_positive: (Result = 1) = (Current > other)
		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

	divisible (other: like Current): BOOLEAN
			-- May current object be divided by other?
		require -- from NUMERIC
			other_exists: other /= Void
		do
			Result := other.item /= 0
		ensure then
			value: Result = (other.item /= 0)
		end

	exponentiable (other: NUMERIC): BOOLEAN
			-- May current object be elevated to the power other?
		require -- from NUMERIC
			other_exists: other /= Void
		do
			if attached {INTEGER_32_REF} other as integer_value then
				Result := integer_value.item >= 0 or item /= 0
			elseif attached {REAL_32_REF} other as real_value then
				Result := real_value.item >= 0.0 or item /= 0
			elseif attached {REAL_64_REF} other as double_value then
				Result := double_value.item >= 0.0 or item /= 0
			end
		ensure then
			safe_values: ((other.conforms_to (0) and item /= 0) or (other.conforms_to (0.0) and item > 0)) implies Result
		end

	is_hashable: BOOLEAN
			-- May current object be hashed?
			-- (True if it is not its type's default.)
		do
			Result := item /= 0
		end

	is_valid_character_32_code: BOOLEAN
			-- Does current object represent a CHARACTER_32?
		do
			Result := item >= 0 and item.to_natural_64 <= {CHARACTER_32}.max_value.to_natural_64
		ensure
			in_bounds: Result = (item >= 0 and item.to_natural_64 >= {CHARACTER_32}.min_value.to_natural_64 and item.to_natural_64 <= {CHARACTER_32}.max_value.to_natural_64)
		end

	is_valid_character_8_code: BOOLEAN
			-- Does current object represent a CHARACTER_8?
		do
			Result := item >= {CHARACTER_8}.min_value.to_integer_64 and item <= {CHARACTER_8}.max_value.to_integer_64
		ensure
			in_bounds: Result = (item >= {CHARACTER_8}.min_value.to_integer_64 and item <= {CHARACTER_8}.max_value.to_integer_64)
		end

	is_valid_character_code: BOOLEAN
		obsolete "Use `is_valid_character_8_code' instead. [2017-05-31]"
			-- Does current object represent a CHARACTER_8?
		do
			Result := is_valid_character_8_code
		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 -- Element change

	set_item (i: INTEGER_64)
			-- Make i the item value.
		do
			item := i
		ensure
			item_set: item = i
		end
	
feature -- Conversion

	as_integer_16: INTEGER_16
			-- Convert item into an INTEGER_16 value.
		do
			Result := item.as_integer_16
		end

	as_integer_32: INTEGER_32
			-- Convert item into an INTEGER_32 value.
		do
			Result := item.as_integer_32
		end

	as_integer_64: INTEGER_64
			-- Convert item into an INTEGER_64 value.
		do
			Result := item.as_integer_64
		end

	as_integer_8: INTEGER_8
			-- Convert item into an INTEGER_8 value.
		do
			Result := item.as_integer_8
		end

	as_natural_16: NATURAL_16
			-- Convert item into an NATURAL_16 value.
		do
			Result := item.as_natural_16
		end

	as_natural_32: NATURAL_32
			-- Convert item into an NATURAL_32 value.
		do
			Result := item.as_natural_32
		end

	as_natural_64: NATURAL_64
			-- Convert item into an NATURAL_64 value.
		do
			Result := item.as_natural_64
		end

	as_natural_8: NATURAL_8
			-- Convert item into an NATURAL_8 value.
		do
			Result := item.as_natural_8
		end

	frozen to_boolean: BOOLEAN
			-- True if not zero.
		do
			Result := item /= 0
		end

	to_character: CHARACTER_8
		obsolete "Use `to_character_8' instead. [2017-05-31]"
			-- Returns corresponding ASCII character to item value.
		require
			valid_character: is_valid_character_8_code
		do
			Result := item.to_character_8
		end

	to_character_32: CHARACTER_32
			-- Associated character in 32 bit version.
		require
			valid_character: is_valid_character_32_code
		do
			Result := item.to_character_32
		end

	to_character_8: CHARACTER_8
			-- Associated character in 8 bit version.
		require
			valid_character: is_valid_character_8_code
		do
			Result := item.to_character_8
		end

	to_double: REAL_64
			-- Convert item into a REAL_64
		do
			Result := item.to_double
		end

	to_hex_character: CHARACTER_8
			-- Convert item into an hexadecimal character.
		require
			in_bounds: 0 <= item and item <= 15
		local
			i: INTEGER_32
		do
			i := item.to_integer_32
			Result := if i <= 9 then
				'0'
			else
				'A' - 10
			end + i
		ensure
			valid_character: ("0123456789ABCDEF").has (Result)
		end

	to_hex_string: STRING_8
			-- Convert item into an hexadecimal string.
		local
			i: INTEGER_32
			val: INTEGER_64
		do
			from
				i := {PLATFORM}.integer_64_bits // 4
				create Result.make_filled ('0', i)
				val := item
			until
				i = 0
			loop
				Result.put ((val & 15).to_hex_character, i)
				val := val |>> 4
				i := i - 1
			end
		ensure
			result_not_void: Result /= Void
			result_valid_count: Result.count = {PLATFORM}.integer_64_bits // 4
		end

	frozen to_integer: INTEGER_32
			-- Convert item into an INTEGER_32 value.
			-- Was declared in INTEGER_64_REF as synonym of to_integer_32.
		require
			not_too_small: item >= {INTEGER_32}.min_value.to_integer_64
			not_too_big: item <= {INTEGER_32}.max_value.to_integer_64
		do
			Result := as_integer_32
		end

	frozen to_integer_16: INTEGER_16
			-- Convert item into an INTEGER_16 value.
		require
			not_too_small: item >= {INTEGER_16}.min_value.to_integer_64
			not_too_big: item <= {INTEGER_16}.max_value.to_integer_64
		do
			Result := as_integer_16
		end

	frozen to_integer_32: INTEGER_32
			-- Convert item into an INTEGER_32 value.
			-- Was declared in INTEGER_64_REF as synonym of to_integer.
		require
			not_too_small: item >= {INTEGER_32}.min_value.to_integer_64
			not_too_big: item <= {INTEGER_32}.max_value.to_integer_64
		do
			Result := as_integer_32
		end

	frozen to_integer_64: INTEGER_64
			-- Return item.
		do
			Result := item
		end

	frozen to_integer_8: INTEGER_8
			-- Convert item into an INTEGER_8 value.
		require
			not_too_small: item >= {INTEGER_8}.min_value.to_integer_64
			not_too_big: item <= {INTEGER_8}.max_value.to_integer_64
		do
			Result := as_integer_8
		end

	frozen to_natural_16: NATURAL_16
			-- Convert item into an NATURAL_16 value.
		require
			item_non_negative: item >= 0
			not_too_big: item <= {NATURAL_16}.max_value.to_integer_64
		do
			Result := as_natural_16
		end

	frozen to_natural_32: NATURAL_32
			-- Convert item into an NATURAL_32 value.
		require
			item_non_negative: item >= 0
			not_too_big: item <= {NATURAL_32}.max_value.to_integer_64
		do
			Result := as_natural_32
		end

	frozen to_natural_64: NATURAL_64
			-- Convert item into an NATURAL_64 value.
		require
			item_non_negative: item >= 0
		do
			Result := as_natural_64
		end

	frozen to_natural_8: NATURAL_8
			-- Convert item into an NATURAL_8 value.
		require
			item_non_negative: item >= 0
			not_too_big: item <= {NATURAL_8}.max_value.to_integer_64
		do
			Result := as_natural_8
		end

	to_real: REAL_32
			-- Convert item into a REAL_32
		do
			Result := item.to_real
		end

	to_reference: INTEGER_64_REF
			-- Associated reference of Current
		do
			create Result;
			Result.set_item (item)
		ensure
			to_reference_not_void: Result /= Void
		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: INTEGER_64_REF)
			-- 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: INTEGER_64_REF)
			-- 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: INTEGER_64_REF
			-- 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: INTEGER_64_REF)
			-- 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: INTEGER_64_REF
			-- 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: INTEGER_64_REF
			-- 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

	abs: INTEGER_64
			-- Absolute value
		do
			Result := abs_ref.item
		ensure
			non_negative: Result >= 0
			same_absolute_value: (Result = item) or (Result = - item)
		end

	frozen as_attached: attached INTEGER_64_REF
		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 INTEGER_64_REF
			-- 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

	identity alias "+": like Current
			-- Unary plus
		do
			create Result;
			Result.set_item (+ item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	integer_quotient alias "//" (other: like Current): like Current
			-- Integer division of Current by other
		require -- from NUMERIC
			other_exists: other /= Void
			good_divisor: divisible (other)
		do
			create Result;
			Result.set_item (item // other.item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	integer_remainder alias "\\" (other: like Current): like Current
			-- Remainder of the integer division of Current by other
		require
			other_exists: other /= Void
			good_divisor: divisible (other)
		do
			create Result;
			Result.set_item (item \\ other.item)
		ensure
			result_exists: Result /= Void
		end

	minus alias "-" alias "−" (other: like Current): like Current
			-- Result of subtracting other
		require -- from NUMERIC
			other_exists: other /= Void
		do
			create Result;
			Result.set_item (item - other.item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	opposite alias "-" alias "−": like Current
			-- Unary minus
		do
			create Result;
			Result.set_item (- item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	plus alias "+" (other: like Current): like Current
			-- Sum with other
		require -- from NUMERIC
			other_exists: other /= Void
		do
			create Result;
			Result.set_item (item + other.item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
			commutative: Result ~ (other + Current)
		end

	power alias "^" (other: REAL_64): REAL_64
			-- Integer power of Current by other
		do
			Result := item ^ other
		end

	product alias "*" alias "×" (other: like Current): like Current
			-- Product by other
		require -- from NUMERIC
			other_exists: other /= Void
		do
			create Result;
			Result.set_item (item * other.item)
		ensure -- from NUMERIC
			result_exists: Result /= Void
		end

	quotient alias "/" alias "÷" (other: like Current): REAL_64
			-- Division by other
		require
			other_exists: other /= Void
			good_divisor: divisible (other)
		do
			Result := item / other.item
		end
	
feature {NONE} -- Implementation

	abs_ref: like Current
			-- Absolute value
		do
			if item >= 0 then
				Result := Current
			else
				Result := - Current
			end
		ensure
			result_exists: Result /= Void
			same_absolute_value: (Result ~ Current) or (Result ~ - Current)
		end
	
feature -- Bit operations

	bit_and alias "&" alias "⊗" (i: like Current): like Current
			-- Bitwise and between Current' and i.
		require
			i_not_void: i /= Void
		do
			create Result;
			Result.set_item (item.bit_and (i.item))
		ensure
			bitwise_and_not_void: Result /= Void
		end

	bit_not alias "⊝": like Current
			-- One's complement of Current.
		do
			create Result;
			Result.set_item (item.bit_not)
		ensure
			bit_not_not_void: Result /= Void
		end

	bit_or alias "|" alias "⦶" (i: like Current): like Current
			-- Bitwise or between Current' and i.
		require
			i_not_void: i /= Void
		do
			create Result;
			Result.set_item (item.bit_or (i.item))
		ensure
			bitwise_or_not_void: Result /= Void
		end

	frozen bit_shift (n: INTEGER_32): INTEGER_64
			-- Shift Current from n position to right if n positive,
			-- to left otherwise.
		require
			n_less_or_equal_to_64: n <= 64
			n_greater_or_equal_to_minus_64: n >= -64
		do
			if n > 0 then
				Result := bit_shift_right (n).item
			else
				Result := bit_shift_left (- n).item
			end
		end

	bit_shift_left alias "|<<" alias "⧀" (n: INTEGER_32): like Current
			-- Shift Current from n position to left.
		require
			n_nonnegative: n >= 0
			n_less_or_equal_to_64: n <= 64
		do
			create Result;
			Result.set_item (item.bit_shift_left (n))
		ensure
			bit_shift_left_not_void: Result /= Void
		end

	bit_shift_right alias "|>>" alias "⧁" (n: INTEGER_32): like Current
			-- Shift Current from n position to right.
		require
			n_nonnegative: n >= 0
			n_less_or_equal_to_64: n <= 64
		do
			create Result;
			Result.set_item (item.bit_shift_right (n))
		ensure
			bit_shift_right_not_void: Result /= Void
		end

	frozen bit_test (n: INTEGER_32): BOOLEAN
			-- Test n-th position of Current.
		require
			n_nonnegative: n >= 0
			n_less_than_64: n < 64
		do
			Result := item & ((1).to_integer_64 |<< n) /= 0
		end

	bit_xor alias "⊕" (i: like Current): like Current
			-- Bitwise xor between Current' and i.
		require
			i_not_void: i /= Void
		do
			create Result;
			Result.set_item (item.bit_xor (i.item))
		ensure
			bitwise_xor_not_void: Result /= Void
		end

	frozen set_bit (b: BOOLEAN; n: INTEGER_32): INTEGER_64
			-- Copy of current with n-th position
			-- set to 1 if b, 0 otherwise.
		require
			n_nonnegative: n >= 0
			n_less_than_64: n < 64
		do
			if b then
				Result := item | ((1).to_integer_64 |<< n)
			else
				Result := item & ((1).to_integer_64 |<< n).bit_not
			end
		end

	frozen set_bit_with_mask (b: BOOLEAN; m: INTEGER_64): INTEGER_64
			-- Copy of current with all 1 bits of m set to 1
			-- if b, 0 otherwise.
		do
			if b then
				Result := item | m
			else
				Result := item & m.bit_not
			end
		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
			-- Printable representation of integer value
		require -- from  DEBUG_OUTPUT
			True
		require -- from  ANY
			True
		do
			create Result.make (20);
			Result.append_integer_64 (item)
		ensure -- from DEBUG_OUTPUT
			result_not_void: Result /= Void
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		local
			s: READABLE_STRING_8
		do
			if attached o then
				s := o.out
				if attached {READABLE_STRING_32} s as s32 then
					Io.put_string_32 (s32)
				elseif attached {READABLE_STRING_8} s as s8 then
					Io.put_string (s8)
				else
					Io.put_string_32 (s.as_string_32)
				end
			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_32
			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: ".as_string_32)
				create l_exc;
				l_msg.append (generating_type.name_32);
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
invariant
	sign_times_abs: sign.to_integer_64 * abs = item

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from COMPARABLE
	irreflexive_comparison: not (Current < Current)

note
	copyright: "Copyright (c) 1984-2020, 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 INTEGER_64_REF

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