note
	description: "Implementation of TUPLE"
	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 14:32:38 +0000 (Tue, 19 May 2020) $"
	revision: "$Revision: 104260 $"

class interface
	TUPLE

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

feature -- Access

	at alias "@" (index: INTEGER_32): detachable separate ANY assign put
			-- Entry of key index.
			-- Was declared in TUPLE as synonym of item.

	boolean_item (index: INTEGER_32): BOOLEAN
			-- Boolean item at index.
		require
			valid_index: valid_index (index)
			is_boolean: is_boolean_item (index)

	character_32_item (index: INTEGER_32): CHARACTER_32
			-- Character item at index.
		require
			valid_index: valid_index (index)
			is_character_32: is_character_32_item (index)

	character_8_item (index: INTEGER_32): CHARACTER_8
			-- Character item at index.
		require
			valid_index: valid_index (index)
			is_character_8: is_character_8_item (index)

	character_item (index: INTEGER_32): CHARACTER_8
			-- Character item at index.
		require
			valid_index: valid_index (index)
			is_character_8: is_character_8_item (index)

	double_item (index: INTEGER_32): REAL_64
			-- Double item at index.
		require
			valid_index: valid_index (index)
			is_numeric: is_double_item (index)

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

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

	integer_16_item (index: INTEGER_32): INTEGER_16
			-- INTEGER_16 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_integer_16_item (index)

	integer_32_item (index: INTEGER_32): INTEGER_32
			-- INTEGER_32 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_integer_32_item (index)

	integer_64_item (index: INTEGER_32): INTEGER_64
			-- INTEGER_64 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_integer_64_item (index)

	integer_8_item (index: INTEGER_32): INTEGER_8
			-- INTEGER_8 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_integer_8_item (index)

	integer_item (index: INTEGER_32): INTEGER_32
			-- INTEGER_32 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_integer_32_item (index)

	item alias "[]" (index: INTEGER_32): detachable separate ANY assign put
			-- Entry of key index.
			-- Was declared in TUPLE as synonym of at.
		require -- from READABLE_INDEXABLE
			valid_index: valid_index (index)

	natural_16_item (index: INTEGER_32): NATURAL_16
			-- NATURAL_16 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_natural_16_item (index)

	natural_32_item (index: INTEGER_32): NATURAL_32
			-- NATURAL_32 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_natural_32_item (index)

	natural_64_item (index: INTEGER_32): NATURAL_64
			-- NATURAL_64 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_natural_64_item (index)

	natural_8_item (index: INTEGER_32): NATURAL_8
			-- NATURAL_8 item at index.
		require
			valid_index: valid_index (index)
			is_integer: is_natural_8_item (index)

	new_cursor: INDEXABLE_ITERATION_CURSOR [detachable separate ANY]
			-- Fresh cursor associated with current structure
			-- (from READABLE_INDEXABLE)
		ensure -- from ITERABLE
			result_attached: Result /= Void

	pointer_item (index: INTEGER_32): POINTER
			-- Pointer item at index.
		require
			valid_index: valid_index (index)
			is_pointer: is_pointer_item (index)

	real_32_item (index: INTEGER_32): REAL_32
			-- real item at index.
		require
			valid_index: valid_index (index)
			is_real_or_integer: is_real_32_item (index)

	real_64_item (index: INTEGER_32): REAL_64
			-- Double item at index.
		require
			valid_index: valid_index (index)
			is_numeric: is_real_64_item (index)

	real_item (index: INTEGER_32): REAL_32
			-- real item at index.
		require
			valid_index: valid_index (index)
			is_real_or_integer: is_real_item (index)

	reference_item (index: INTEGER_32): detachable separate ANY
			-- Reference item at index.
		require
			valid_index: valid_index (index)
			is_reference: is_reference_item (index)

	wide_character_item (index: INTEGER_32): CHARACTER_32
			-- Character item at index.
		require
			valid_index: valid_index (index)
			is_character_32: is_character_32_item (index)
	
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)
		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)

	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)
		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))

	frozen is_deep_equal alias "≡≡≡" (other: TUPLE): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		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)

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

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

	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)
		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))

	frozen standard_is_equal alias "≜" (other: TUPLE): 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
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
	
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

	count: INTEGER_32
			-- Number of element in Current.

	hash_code: INTEGER_32
			-- Hash code value
		ensure -- from HASHABLE
			good_hash_value: Result >= 0

	is_empty: BOOLEAN
			-- Is Current empty?

	is_hashable: BOOLEAN
			-- May current object be hashed?
			-- (True by default.)
			-- (from HASHABLE)

	Lower: INTEGER_32 = 1
			-- Lower bound of TUPLE.

	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
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))

	upper: INTEGER_32
			-- Upper bound of TUPLE.
			-- Use count instead.
		ensure
			definition: Result = count

	valid_index (k: INTEGER_32): BOOLEAN
			-- Is k a valid key?
		ensure -- from READABLE_INDEXABLE
			only_if_in_index_set: Result implies (Lower <= k and k <= count)

	valid_type_for_index (v: detachable separate ANY; index: INTEGER_32): BOOLEAN
			-- Is object v a valid target for element at position index?
		require
			valid_index: valid_index (index)
	
feature -- Status setting

	compare_objects
			-- Ensure that future search operations will use equal
			-- rather than = for comparing references.
		ensure
			object_comparison: object_comparison

	compare_references
			-- Ensure that future search operations will use =
			-- rather than equal for comparing references.
		ensure
			reference_comparison: not object_comparison
	
feature -- Element change

	put (v: detachable separate ANY; index: INTEGER_32)
			-- Insert v at position index.
		require
			valid_index: valid_index (index)
			valid_type_for_index: valid_type_for_index (v, index)

	put_boolean (v: BOOLEAN; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_boolean_item (index)

	put_character (v: CHARACTER_8; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_character_8_item (index)

	put_character_32 (v: CHARACTER_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_character_32_item (index)

	put_character_8 (v: CHARACTER_8; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_character_8_item (index)

	put_double (v: REAL_64; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_double_item (index)

	put_integer (v: INTEGER_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_integer_32_item (index)

	put_integer_16 (v: INTEGER_16; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_integer_16_item (index)

	put_integer_32 (v: INTEGER_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_integer_32_item (index)

	put_integer_64 (v: INTEGER_64; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_integer_64_item (index)

	put_integer_8 (v: INTEGER_8; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_integer_8_item (index)

	put_natural_16 (v: NATURAL_16; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_natural_16_item (index)

	put_natural_32 (v: NATURAL_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_natural_32_item (index)

	put_natural_64 (v: NATURAL_64; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_natural_64_item (index)

	put_natural_8 (v: NATURAL_8; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_natural_8_item (index)

	put_pointer (v: POINTER; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_pointer_item (index)

	put_real (v: REAL_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_real_item (index)

	put_real_32 (v: REAL_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_real_item (index)

	put_real_64 (v: REAL_64; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_double_item (index)

	put_reference (v: detachable separate ANY; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type_for_index: valid_type_for_index (v, index)
			valid_type: is_reference_item (index)

	put_wide_character (v: CHARACTER_32; index: INTEGER_32)
			-- Put v at position index in Current.
		require
			valid_index: valid_index (index)
			valid_type: is_character_32_item (index)
	
feature -- Duplication

	copy (other: TUPLE)
			-- 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)
		ensure -- from ANY
			is_equal: Current ~ other

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

	frozen deep_twin: TUPLE
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)

	frozen standard_copy (other: TUPLE)
			-- 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)
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)

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

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

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

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

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

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
	
feature -- Access: lower level

	Any_code: NATURAL_8 = 255
			-- Code used to identify type in TUPLE.

	Boolean_code: NATURAL_8 = 1

	Character_32_code: NATURAL_8 = 14
			-- Was declared in TUPLE as synonym of Wide_character_code.

	Character_8_code: NATURAL_8 = 2
			-- Was declared in TUPLE as synonym of Character_code.

	Character_code: NATURAL_8 = 2
			-- Was declared in TUPLE as synonym of Character_8_code.

	Integer_16_code: NATURAL_8 = 7

	Integer_32_code: NATURAL_8 = 8

	Integer_64_code: NATURAL_8 = 9

	Integer_8_code: NATURAL_8 = 6

	item_code (index: INTEGER_32): NATURAL_8
			-- Type code of item at index. Used for
			-- argument processing in ROUTINE
		require
			valid_index: valid_index (index)

	Natural_16_code: NATURAL_8 = 11

	Natural_32_code: NATURAL_8 = 12

	Natural_64_code: NATURAL_8 = 13

	Natural_8_code: NATURAL_8 = 10

	Pointer_code: NATURAL_8 = 5

	Real_32_code: NATURAL_8 = 4

	Real_64_code: NATURAL_8 = 3

	Reference_code: NATURAL_8 = 0

	Wide_character_code: NATURAL_8 = 14
			-- Was declared in TUPLE as synonym of Character_32_code.
	
feature -- Concatenation

	plus alias "+" (a_other: TUPLE): detachable like Current
			-- Concatenation of Current with a_other.
		ensure
			has_expected_count: Result /= Void implies Result.count = count + a_other.count
			has_expected_items: Result /= Void implies ((∀ ic_1: 1 |..| count ¦
					Result [ic_1] = item (ic_1)) and (∀ ic_2: 1 |..| a_other.count ¦
					Result [count + ic_2] = a_other [ic_2]))
	
feature -- Correction

	Mismatch_information: MISMATCH_INFORMATION
			-- Original attribute values of mismatched object
			-- (from MISMATCH_CORRECTOR)
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void

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

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
	
feature -- Retrieval

	correct_mismatch
			-- Attempt to correct object mismatch using Mismatch_information.
	
feature -- Type queries

	is_boolean_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a BOOLEAN?
		require
			valid_index: valid_index (index)

	is_character_32_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a CHARACTER_32?
			-- Was declared in TUPLE as synonym of is_wide_character_item.
		require
			valid_index: valid_index (index)

	is_character_8_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a CHARACTER_8?
			-- Was declared in TUPLE as synonym of is_character_item.
		require
			valid_index: valid_index (index)

	is_character_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a CHARACTER_8?
			-- Was declared in TUPLE as synonym of is_character_8_item.
		require
			valid_index: valid_index (index)

	is_double_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a REAL_64?
		require
			valid_index: valid_index (index)

	is_integer_16_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an INTEGER_16?
		require
			valid_index: valid_index (index)

	is_integer_32_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an INTEGER_32?
			-- Was declared in TUPLE as synonym of is_integer_item.
		require
			valid_index: valid_index (index)

	is_integer_64_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an INTEGER_64?
		require
			valid_index: valid_index (index)

	is_integer_8_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an INTEGER_8?
		require
			valid_index: valid_index (index)

	is_integer_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an INTEGER_32?
			-- Was declared in TUPLE as synonym of is_integer_32_item.
		require
			valid_index: valid_index (index)

	is_natural_16_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an NATURAL_16?
		require
			valid_index: valid_index (index)

	is_natural_32_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an NATURAL_32?
		require
			valid_index: valid_index (index)

	is_natural_64_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an NATURAL_64?
		require
			valid_index: valid_index (index)

	is_natural_8_item (index: INTEGER_32): BOOLEAN
			-- Is item at index an NATURAL_8?
		require
			valid_index: valid_index (index)

	is_pointer_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a POINTER?
		require
			valid_index: valid_index (index)

	is_real_32_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a REAL_32?
		require
			valid_index: valid_index (index)

	is_real_64_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a REAL_64?
		require
			valid_index: valid_index (index)

	is_real_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a REAL_32?
		require
			valid_index: valid_index (index)

	is_reference_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a REFERENCE?
		require
			valid_index: valid_index (index)

	is_uniform: BOOLEAN
			-- Are all items of the same basic type or all of reference type?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_boolean: BOOLEAN
			-- Are all items of type BOOLEAN?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_character: BOOLEAN
			-- Are all items of type CHARACTER_8?
			-- Was declared in TUPLE as synonym of is_uniform_character_8.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_character_32: BOOLEAN
			-- Are all items of type CHARACTER_32?
			-- Was declared in TUPLE as synonym of is_uniform_wide_character.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_character_8: BOOLEAN
			-- Are all items of type CHARACTER_8?
			-- Was declared in TUPLE as synonym of is_uniform_character.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_double: BOOLEAN
			-- Are all items of type REAL_64?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_integer: BOOLEAN
			-- Are all items of type INTEGER?
			-- Was declared in TUPLE as synonym of is_uniform_integer_32.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_integer_16: BOOLEAN
			-- Are all items of type INTEGER_16?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_integer_32: BOOLEAN
			-- Are all items of type INTEGER?
			-- Was declared in TUPLE as synonym of is_uniform_integer.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_integer_64: BOOLEAN
			-- Are all items of type INTEGER_64?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_integer_8: BOOLEAN
			-- Are all items of type INTEGER_8?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_natural_16: BOOLEAN
			-- Are all items of type NATURAL_16?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_natural_32: BOOLEAN
			-- Are all items of type NATURAL_32?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_natural_64: BOOLEAN
			-- Are all items of type NATURAL_64?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_natural_8: BOOLEAN
			-- Are all items of type NATURAL_8?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_pointer: BOOLEAN
			-- Are all items of type POINTER?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_real: BOOLEAN
			-- Are all items of type REAL_32?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_real_32: BOOLEAN
			-- Are all items of type REAL_32?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_real_64: BOOLEAN
			-- Are all items of type REAL_64?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_reference: BOOLEAN
			-- Are all items of reference type?
		ensure
			yes_if_empty: (count = 0) implies Result

	is_uniform_wide_character: BOOLEAN
			-- Are all items of type CHARACTER_32?
			-- Was declared in TUPLE as synonym of is_uniform_character_32.
		ensure
			yes_if_empty: (count = 0) implies Result

	is_wide_character_item (index: INTEGER_32): BOOLEAN
			-- Is item at index a CHARACTER_32?
			-- Was declared in TUPLE as synonym of is_character_32_item.
		require
			valid_index: valid_index (index)
	
invariant
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from READABLE_INDEXABLE
	consistent_boundaries: Lower <= count or else Lower = count + 1

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 TUPLE

Generated by ISE EiffelStudio