note
	description: "Interface for platform-dependent properties"
	library: "Gobo Eiffel Kernel Library"
	copyright: "Copyright (c) 2002-2018, Eric Bezault and others"
	license: "MIT License"
	date: "$Date: 2019-02-07 22:54:15 +0000 (Thu, 07 Feb 2019) $"
	revision: "$Revision: 102807 $"

deferred class interface
	KI_PLATFORM

feature -- Access

	generating_type: TYPE [detachable KI_PLATFORM]
			-- 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
	
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 (other: KI_PLATFORM): 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: KI_PLATFORM): 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 ~ Current
			consistent: standard_is_equal (other) implies Result

	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 (other: KI_PLATFORM): 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

	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))
	
feature -- Duplication

	copy (other: KI_PLATFORM)
			-- 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: KI_PLATFORM)
			-- 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: KI_PLATFORM
			-- 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: KI_PLATFORM)
			-- 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: KI_PLATFORM
			-- 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: KI_PLATFORM
			-- 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 KI_PLATFORM
			-- 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 -- Bits

	boolean_bits: INTEGER_32
			-- Number of bits in a value of type BOOLEAN
		ensure
			instance_free: class
			large_enough: Result >= 1

	Byte_bits: INTEGER_32 = 8
			-- Number of bits in a byte

	character_bits: INTEGER_32
			-- Number of bits in a value of type CHARACTER
		ensure
			instance_free: class
			more_than_byte: Result >= Byte_bits

	double_bits: INTEGER_32
			-- Number of bits in a value of type DOUBLE
		ensure
			instance_free: class
			more_than_real: Result >= real_bits

	integer_bits: INTEGER_32
			-- Number of bits in a value of type INTEGER
		ensure
			instance_free: class
			more_than_character: Result >= character_bits

	pointer_bits: INTEGER_32
			-- Number of bits in a value of type POINTER
		ensure
			instance_free: class

	real_bits: INTEGER_32
			-- Number of bits in a value of type REAL
		ensure
			instance_free: class
	
feature -- Bytes

	boolean_bytes: INTEGER_32
			-- Number of bytes in a value of type BOOLEAN
		ensure
			instance_free: class
			meaningful: Result >= 1

	Byte_bytes: INTEGER_32 = 1
			-- Number of bytes in a byte

	character_bytes: INTEGER_32
			-- Number of bytes in a value of type CHARACTER
		ensure
			instance_free: class
			meaningful: Result >= 1
			more_than_byte: Result >= Byte_bytes

	double_bytes: INTEGER_32
			-- Number of bytes in a value of type DOUBLE
		ensure
			instance_free: class
			meaningful: Result >= 1
			more_than_real: Result >= real_bytes

	integer_bytes: INTEGER_32
			-- Number of bytes in a value of type INTEGER
		ensure
			instance_free: class
			meaningful: Result >= 1
			more_than_character: Result >= character_bytes

	pointer_bytes: INTEGER_32
			-- Number of bytes in a value of type POINTER
		ensure
			instance_free: class
			meaningful: Result >= 1

	real_bytes: INTEGER_32
			-- Number of bytes in a value of type REAL
		ensure
			instance_free: class
			meaningful: Result >= 1
	
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 -- Values

	Maximum_byte_code: INTEGER_32 = 255
			-- Largest supported code for a byte

	maximum_character_code: INTEGER_32
			-- Largest supported code for CHARACTER values
		ensure
			instance_free: class
			meaningful: Result >= Maximum_byte_code

	maximum_integer: INTEGER_32
			-- Largest supported value of type INTEGER
		ensure
			instance_free: class
			meaningful: Result >= 0
			definition: Result = - (minimum_integer + 1)

	maximum_integer_64: INTEGER_64
			-- Largest supported value of type INTEGER_64
		ensure
			instance_free: class
			meaningful: Result >= 0
			definition: Result = - (minimum_integer_64 + 1)

	Minimum_byte_code: INTEGER_32 = 0
			-- Smallest supported code for a byte

	minimum_character_code: INTEGER_32
			-- Smallest supported code for CHARACTER values
		ensure
			instance_free: class
			meaningful: Result = 0

	minimum_integer: INTEGER_32
			-- Smallest supported value of type INTEGER
		ensure
			instance_free: class
			meaningful: Result <= 0
			definition: Result.to_double = (2 ^ (integer_bits - 2).to_double) * -2.to_double

	minimum_integer_64: INTEGER_64
			-- Smallest supported value of type INTEGER_64
		ensure
			instance_free: class
			meaningful: Result <= 0
	
invariant
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

end -- class KI_PLATFORM

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