note
	description: "[
							A GAME_HAPTIC_EFFECT that play on a periodic strength.
							A periodic effect consists of a wave-shaped effect that
							repeats itself over time. Example:
		
							button         period
							press          |     |
							  ||      __    __    __    __    __    _
							  ||     |  |  |  |  |  |  |  |  |  |   magnitude   __ Offset
							  \/     |  |__|  |__|  |__|  |__|  |   _
							    -----
							      |
							    delay          phase >>
							
							-------------------------------------
							              length
							===================================================
							                      interval
	]"
	author: "Louis Marchand"
	date: "Tue, 03 Mar 2015 14:16:22 +0000"
	revision: "2.0"

class 
	GAME_HAPTIC_PERIODIC_EFFECT

create 
	make_sine,
	make_square,
	make_triangle,
	make_sawtooth_up,
	make_sawtooth_down

feature {NONE} -- Initialization

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

	make_sawtooth_down
			-- Initialization of Current using a sawtooth periodic effect opened at the bottom
			-- \  |\  |\  |\  |\  |\  |\  |
			--  \ | \ | \ | \ | \ | \ | \ |
			--   \|  \|  \|  \|  \|  \|  \|
		do
			make
			set_type ({GAME_SDL_EXTERNAL}.sdl_haptic_sawtoothdown.as_natural_16)
		end

	make_sawtooth_up
			-- Initialization of Current using a sawtooth periodic effect opened at the bottom
			--   /|  /|  /|  /|  /|  /|  /|
			--  / | / | / | / | / | / | / |
			-- /  |/  |/  |/  |/  |/  |/  |
		do
			make
			set_type ({GAME_SDL_EXTERNAL}.sdl_haptic_sawtoothup.as_natural_16)
		end

	make_sine
			-- Initialization of Current using a sine periodic effect
			--   __      __      __      __
			--  /  \    /  \    /  \    /
			-- /    \__/    \__/    \__/
		do
			make
			set_type ({GAME_SDL_EXTERNAL}.sdl_haptic_sine.as_natural_16)
		end

	make_square
			-- Initialization of Current using a square periodic effect
			--  __    __    __    __    __
			-- |  |  |  |  |  |  |  |  |  |
			-- |  |__|  |__|  |__|  |__|  |
		do
			make
			set_type ({GAME_SDL_EXTERNAL}.sdl_haptic_leftright.as_natural_16)
		end

	make_triangle
			-- Initialization of Current using a triangle periodic effect
			--   /\    /\    /\    /\    /\
			--  /  \  /  \  /  \  /  \  /
			-- /    \/    \/    \/    \/
		do
			make
			set_type ({GAME_SDL_EXTERNAL}.sdl_haptic_triangle.as_natural_16)
		end
	
feature -- Initialization

	make
			-- Initialize current with given structure_size.
			-- (from MEMORY_STRUCTURE)
		local
			null: POINTER
		do
			internal_item := null
			create managed_pointer.make (structure_size)
			shared := False
		ensure -- from MEMORY_STRUCTURE
			not_shared: not shared
		end

	make_by_pointer (a_ptr: POINTER)
			-- Initialize current with a_ptr.
			-- (from MEMORY_STRUCTURE)
		require -- from MEMORY_STRUCTURE
			a_ptr_not_null: a_ptr /= default_pointer
		do
			internal_item := a_ptr
			managed_pointer := Void
			shared := True
		ensure -- from MEMORY_STRUCTURE
			shared: shared
		end
	
feature -- Access

	delay: NATURAL_16 assign set_delay
			-- delay before starting Current (in millisecond)
		require -- from GAME_HAPTIC_EFFECT_DELAYED
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_delay (specific_item)
		end

	direction: GAME_HAPTIC_DIRECTION assign set_direction
			-- The orientation that the force of Current come from
		require
			exists: exists
		do
			create Result.make_by_pointer ({GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_direction (specific_item))
		end

	fade_in_length: NATURAL_16 assign set_fade_in_length
			-- length of the fade in
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_attack_length (specific_item)
		end

	fade_in_level: NATURAL_16 assign set_fade_in_level
			-- level at the start of the fade in
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_attack_level (specific_item)
		end

	fade_out_length: NATURAL_16 assign set_fade_out_length
			-- length of the fade out
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_fade_length (specific_item)
		end

	fade_out_level: NATURAL_16 assign set_fade_out_level
			-- level at the start of the fade out
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_fade_level (specific_item)
		end

	generating_type: TYPE [detachable GAME_HAPTIC_PERIODIC_EFFECT]
			-- 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

	interval: NATURAL_16 assign set_interval
			-- how soon before effect can be triggered again (in millisecond)
		require -- from GAME_HAPTIC_EFFECT_DELAYED
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_interval (specific_item)
		end

	is_infinite: BOOLEAN
			-- It True, Current will never stop by itself when started
			-- (from GAME_HAPTIC_EFFECT_INFINITE_LENGTH)
		require -- from GAME_HAPTIC_EFFECT_INFINITE_LENGTH
			exists: exists
		do
			Result := length = {GAME_SDL_EXTERNAL}.sdl_haptic_infinity
		end

	item: POINTER
			-- Access to memory area.
			-- (from MEMORY_STRUCTURE)
		local
			m: like managed_pointer
		do
			if shared then
				Result := internal_item
			else
				m := managed_pointer
				if m /= Void then
					Result := m.item
				end
			end
		end

	length: NATURAL_32 assign set_length
			-- Duration of Current (in millisecond)
		require -- from GAME_HAPTIC_EFFECT
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_length (specific_item)
		end

	magnitude: INTEGER_16 assign set_magnitude
			-- peak value; if negative, equivalent to 180 degrees extra phase shift
		require
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_magnitude (specific_item)
		end

	offset: INTEGER_16 assign set_offset
			-- Mean value of the wave
		require
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_offset (specific_item)
		end

	period: NATURAL_16 assign set_period
			-- Time (in millisecond) between two wave.
		require
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_period (specific_item)
		end

	phase: NATURAL_16 assign set_phase
			-- Time (in millisecond) between two wave.
		require
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_periodic_phase (specific_item)
		end

	set_delay (a_delay: NATURAL_16)
			-- Assign delay with the value of a_delay
		require -- from GAME_HAPTIC_EFFECT_DELAYED
			exists: exists
			delay_valid: a_delay <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_delay (specific_item, a_delay)
		ensure -- from GAME_HAPTIC_EFFECT_DELAYED
			is_assign: delay = a_delay
		end

	set_direction (a_direction: GAME_HAPTIC_DIRECTION)
			-- assign direction with the values of a_direction
		require
			exists: exists
		do
			direction.copy (a_direction)
		ensure
			is_assign: direction ~ a_direction
		end

	set_fade_in_length (a_fade_in_length: NATURAL_16)
			-- Assign fade_in_length with the value of a_fade_in_length
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
			length_valid: a_fade_in_length <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_attack_length (specific_item, a_fade_in_length)
		ensure -- from GAME_HAPTIC_EFFECT_ENVELOPE
			is_assign: fade_in_length = a_fade_in_length
		end

	set_fade_in_level (a_fade_in_level: NATURAL_16)
			-- Assign fade_in_level with the value of a_fade_in_level
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
			level_valid: a_fade_in_level <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_attack_level (specific_item, a_fade_in_level)
		ensure -- from GAME_HAPTIC_EFFECT_ENVELOPE
			is_assign: fade_in_level = a_fade_in_level
		end

	set_fade_out_length (a_fade_out_length: NATURAL_16)
			-- Assign fade_out_length with the value of a_fade_out_length
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
			length_valid: a_fade_out_length <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_fade_length (specific_item, a_fade_out_length)
		ensure -- from GAME_HAPTIC_EFFECT_ENVELOPE
			is_assign: fade_out_length = a_fade_out_length
		end

	set_fade_out_level (a_fade_out_level: NATURAL_16)
			-- Assign fade_out_level with the value of a_fade_out_level
		require -- from GAME_HAPTIC_EFFECT_ENVELOPE
			exists: exists
			level_valid: a_fade_out_level <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_fade_level (specific_item, a_fade_out_level)
		ensure -- from GAME_HAPTIC_EFFECT_ENVELOPE
			is_assign: fade_out_level = a_fade_out_level
		end

	set_infinite
			-- When played, Current will never stop by itself
			-- (from GAME_HAPTIC_EFFECT_INFINITE_LENGTH)
		require -- from GAME_HAPTIC_EFFECT_INFINITE_LENGTH
			exists: exists
		do
			set_length ({GAME_SDL_EXTERNAL}.sdl_haptic_infinity)
		ensure -- from GAME_HAPTIC_EFFECT_INFINITE_LENGTH
			infinite_is_set: is_infinite
		end

	set_interval (a_interval: NATURAL_16)
			-- Assign interval with the value of a_interval
		require -- from GAME_HAPTIC_EFFECT_DELAYED
			exists: exists
			interval_valid: a_interval <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_interval (specific_item, a_interval)
		ensure -- from GAME_HAPTIC_EFFECT_DELAYED
			is_assign: interval = a_interval
		end

	set_length (a_length: NATURAL_32)
			-- Assign length with the value of a_length
		require -- from GAME_HAPTIC_EFFECT
			exists: exists
			length_valid: a_length <= 32767
		require else -- from GAME_HAPTIC_EFFECT_INFINITE_LENGTH
			exists: exists
			length_valid: a_length <= 32767 or a_length = {GAME_SDL_EXTERNAL}.sdl_haptic_infinity
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_length (specific_item, a_length)
		ensure -- from GAME_HAPTIC_EFFECT
			is_assign: length = a_length
		end

	set_magnitude (a_magnitude: INTEGER_16)
			-- Assign magnitude with the value of a_magnitude
		require
			exists: exists
			magnitude_valid: a_magnitude <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_magnitude (specific_item, a_magnitude)
		ensure
			is_assign: magnitude = a_magnitude
		end

	set_offset (a_offset: INTEGER_16)
			-- Assign offset with the value of a_offset
		require
			exists: exists
			offset_valid: a_offset <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_offset (specific_item, a_offset)
		ensure
			is_assign: offset = a_offset
		end

	set_period (a_period: NATURAL_16)
			-- Assign period with the value of a_period
		require
			exists: exists
			period_valid: a_period <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_period (specific_item, a_period)
		ensure
			is_assign: period = a_period
		end

	set_phase (a_phase: NATURAL_16)
			-- Assign phase with the value of a_phase
		require
			exists: exists
			phase_valid: a_phase <= 32767
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_periodic_phase (specific_item, a_phase)
		ensure
			is_assign: phase = a_phase
		end

	shared: BOOLEAN
			-- Is current memory area shared with others?
			-- (from MEMORY_STRUCTURE)
	
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: GAME_HAPTIC_PERIODIC_EFFECT): 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: GAME_HAPTIC_PERIODIC_EFFECT): 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 alias "≜" (other: GAME_HAPTIC_PERIODIC_EFFECT): 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

	exists: BOOLEAN
			-- Is allocated memory still allocated?
			-- (from MEMORY_STRUCTURE)
		do
			Result := item /= default_pointer
		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: GAME_HAPTIC_PERIODIC_EFFECT)
			-- 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: GAME_HAPTIC_PERIODIC_EFFECT)
			-- 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: GAME_HAPTIC_PERIODIC_EFFECT
			-- 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: GAME_HAPTIC_PERIODIC_EFFECT)
			-- 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: GAME_HAPTIC_PERIODIC_EFFECT
			-- 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: GAME_HAPTIC_PERIODIC_EFFECT
			-- 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 GAME_HAPTIC_PERIODIC_EFFECT
		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 GAME_HAPTIC_PERIODIC_EFFECT
			-- 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} -- Implementation

	internal_item: POINTER
			-- Pointer holding value when shared.
			-- (from MEMORY_STRUCTURE)

	managed_pointer: detachable MANAGED_POINTER
			-- Hold memory area in a managed way.
			-- (from MEMORY_STRUCTURE)

	set_type (a_type: NATURAL_16)
			-- Assign type with the value of a_type
			-- (from GAME_HAPTIC_EFFECT)
		require -- from GAME_HAPTIC_EFFECT
			exists: exists
		do
			{GAME_SDL_EXTERNAL}.set_sdl_haptic_effect_type (item, a_type)
		ensure -- from GAME_HAPTIC_EFFECT
			is_assign: type = a_type
		end

	specific_item: POINTER
			-- Internal pointer that is specific to a certain type of Current
			-- Note that item only point to a C union.
		require -- from GAME_HAPTIC_EFFECT
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_effect_periodic (item)
		ensure -- from GAME_HAPTIC_EFFECT
			result_not_null: not Result.is_default_pointer
		end

	type: NATURAL_16 assign set_type
			-- Internal type of Current
			-- (from GAME_HAPTIC_EFFECT)
		require -- from GAME_HAPTIC_EFFECT
			exists: exists
		do
			Result := {GAME_SDL_EXTERNAL}.get_sdl_haptic_effect_type (item)
		end
	
feature -- Implementation

	structure_size: INTEGER_32
			-- Size to allocate (in bytes).
			-- (from GAME_HAPTIC_EFFECT)
		do
			Result := {GAME_SDL_EXTERNAL}.c_sizeof_sdl_haptic_effect
		ensure -- from MEMORY_STRUCTURE
			is_class: class
			positive_result: Result > 0
		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)
		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
		-- from GAME_HAPTIC_EFFECT
	type_valid: type > 0

		-- from MEMORY_STRUCTURE
	managed_pointer_valid: not shared implies managed_pointer /= Void
	internal_item_valid: shared implies internal_item /= default_pointer

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

end -- class GAME_HAPTIC_PERIODIC_EFFECT

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