    indexing
    	description: "Implementation of TUPLE"
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-01-22 18:25:44 -0800 (Sun, 22 Jan 2006) $"
    	revision: "$Revision: 56675 $"

    class interface
    	TUPLE

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

    	make

    feature -- Access

    	any_code: NATURAL_8 is 255
    			-- Code used to identify type in TUPLE.

    	boolean_code: NATURAL_8 is 1

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

    	character_code: NATURAL_8 is 2

    	character_item (index: INTEGER_32): CHARACTER_8
    			-- Character item at `index'.
    		require
    			valid_index: valid_index (index)
    			is_character: is_character_item (index)

    	double_item (index: INTEGER_32): REAL_64
    			-- Double item at `index'.
    			-- Was declared in TUPLE as synonym of real_64_item.
    		require
    			valid_index: valid_index (index)
    			is_numeric: is_double_item (index)

    	generating_type: STRING_8
    			-- Name of current object's generating type
    			-- (type of which it is a direct instance)
    			-- (from ANY)

    	generator: STRING_8
    			-- Name of current object's generating class
    			-- (base class of the type of which it is a direct instance)
    			-- (from ANY)

    	integer_16_code: NATURAL_8 is 7

    	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_code: NATURAL_8 is 8

    	integer_32_item (index: INTEGER_32): INTEGER_32
    			-- INTEGER_32 item at `index'.
    			-- Was declared in TUPLE as synonym of integer_item.
    		require
    			valid_index: valid_index (index)
    			is_integer: is_integer_32_item (index)

    	integer_64_code: NATURAL_8 is 9

    	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_code: NATURAL_8 is 6

    	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'.
    			-- Was declared in TUPLE as synonym of integer_32_item.
    		require
    			valid_index: valid_index (index)
    			is_integer: is_integer_32_item (index)

    	item alias "[]" (index: INTEGER_32): ANY assign put
    			-- Entry of key `index'.
    			-- Was declared in TUPLE as synonym of infix "@".
    		require
    			valid_index: valid_index (index)

    	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 is 11

    	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_code: NATURAL_8 is 12

    	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_code: NATURAL_8 is 13

    	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_code: NATURAL_8 is 10

    	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)

    	pointer_code: NATURAL_8 is 5

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

    	real_32_code: NATURAL_8 is 4

    	real_32_item (index: INTEGER_32): REAL_32
    			-- real item at `index'.
    			-- Was declared in TUPLE as synonym of real_item.
    		require
    			valid_index: valid_index (index)
    			is_real_or_integer: is_real_item (index)

    	real_64_code: NATURAL_8 is 3

    	real_64_item (index: INTEGER_32): REAL_64
    			-- Double item at `index'.
    			-- Was declared in TUPLE as synonym of double_item.
    		require
    			valid_index: valid_index (index)
    			is_numeric: is_double_item (index)

    	real_item (index: INTEGER_32): REAL_32
    			-- real item at `index'.
    			-- Was declared in TUPLE as synonym of real_32_item.
    		require
    			valid_index: valid_index (index)
    			is_real_or_integer: is_real_item (index)

    	reference_code: NATURAL_8 is 0

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

    	wide_character_code: NATURAL_8 is 14

    	wide_character_item (index: INTEGER_32): CHARACTER_32
    			-- Character item at `index'.
    		require
    			valid_index: valid_index (index)
    			is_wide_character: is_wide_character_item (index)

    	infix "@" (index: INTEGER_32): ANY assign put
    			-- Entry of key `index'.
    			-- Was declared in TUPLE as synonym of item.
    		require
    			valid_index: valid_index (index)

    feature -- Comparison

    	frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void
    			-- or attached to isomorphic object structures?
    			-- (from ANY)
    		ensure -- from ANY
    			shallow_implies_deep: standard_equal (some, other) implies Result
    			both_or_none_void: (some = Void) implies (Result = (other = Void))
    			same_type: (Result and (some /= Void)) implies some.same_type (other)
    			symmetric: Result implies deep_equal (other, some)

    	frozen equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached
    			-- to objects considered equal?
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

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

    	frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' 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
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

    	frozen standard_is_equal (other: like Current): 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 if it is not its type's default.)
    			-- (from HASHABLE)
    		ensure -- from HASHABLE
    			ok_if_not_default: Result implies (Current /= default)

    	lower: INTEGER_32 is 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.

    	valid_index (k: INTEGER_32): BOOLEAN
    			-- Is `k' a valid key?

    	valid_type_for_index (v: ANY; index: INTEGER_32): BOOLEAN
    			-- Is object `v' a valid target for element at position `index'?
    		require
    			valid_index: valid_index (index)

    feature -- Element change

    	put (v: 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_item (index)

    	put_double (v: REAL_64; index: INTEGER_32)
    			-- Put `v' at position `index' in Current.
    			-- Was declared in TUPLE as synonym of put_real_64.
    		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.
    			-- Was declared in TUPLE as synonym of put_integer_32.
    		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.
    			-- Was declared in TUPLE as synonym of put_integer.
    		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.
    			-- Was declared in TUPLE as synonym of put_real_32.
    		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.
    			-- Was declared in TUPLE as synonym of put_real.
    		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.
    			-- Was declared in TUPLE as synonym of put_double.
    		require
    			valid_index: valid_index (index)
    			valid_type: is_double_item (index)

    	put_reference (v: ANY; index: INTEGER_32)
    			-- Put `v' at position `index' in Current.
    		require
    			valid_index: valid_index (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_wide_character_item (index)

    feature -- Duplication

    	copy (other: like Current)
    			-- 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: is_equal (other)

    	frozen deep_copy (other: like Current)
    			-- 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: like Current
    			-- New object structure recursively duplicated from Current.
    			-- (from ANY)
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, Result)

    	frozen standard_copy (other: like Current)
    			-- 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: like Current
    			-- 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: like Current
    			-- New object equal to `Current'
    			-- twin calls copy; to change copying/twining semantics, redefine copy.
    			-- (from ANY)
    		ensure -- from ANY
    			twin_not_void: Result /= Void
    			is_equal: Result.is_equal (Current)

    feature -- Basic operations

    	frozen default: like Current
    			-- 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)

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

    	frozen do_nothing
    			-- Execute a null action.
    			-- (from ANY)

    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)

    	out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of tagged_out.
    			-- (from ANY)

    	print (some: ANY)
    			-- Write terse external representation of `some'
    			-- on standard output.
    			-- (from ANY)

    	frozen tagged_out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of out.
    			-- (from ANY)

    feature -- Platform

    	operating_environment: OPERATING_ENVIRONMENT
    			-- Objects available from the operating system
    			-- (from ANY)

    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_item (index: INTEGER_32): BOOLEAN
    			-- Is item at `index' a CHARACTER?
    		require
    			valid_index: valid_index (index)

    	is_double_item (index: INTEGER_32): BOOLEAN
    			-- Is item at `index' a DOUBLE?
    		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_item (index: INTEGER_32): BOOLEAN
    			-- Is item at `index' a REAL?
    		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?
    		ensure
    			yes_if_empty: (count = 0) implies Result

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

    	is_wide_character_item (index: INTEGER_32): BOOLEAN
    			-- Is item at `index' a WIDE_CHARACTER?
    		require
    			valid_index: valid_index (index)

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

    indexing
    	library: "EiffelBase: Library of reusable components for Eiffel."
    	copyright: "Copyright (c) 1984-2006, Eiffel Software and others"
    	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
    	source: "[
    		Eiffel Software
    		356 Storke Road, 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