    indexing
    	description: "Files viewed as persistent sequences of ASCII characters"
    	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
    	PLAIN_TEXT_FILE

    create
    	make (fn: STRING_8)
    			-- Create file object with `fn' as file name.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			file_closed: is_closed

    	make_open_read (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file in read mode.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read

    	make_open_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for writing;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_write: is_open_write

    	make_open_append (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file in append-only mode.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_append: is_open_append

    	make_open_read_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for both reading and writing.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	make_create_read_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for both reading and writing;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	make_open_read_append (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for reading anywhere
    			-- but writing at the end only.
    			-- Create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_append: is_open_append

    feature -- Initialization

    	make (fn: STRING_8)
    			-- Create file object with `fn' as file name.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			file_closed: is_closed

    	make_create_read_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for both reading and writing;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	make_open_append (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file in append-only mode.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_append: is_open_append

    	make_open_read (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file in read mode.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read

    	make_open_read_append (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for reading anywhere
    			-- but writing at the end only.
    			-- Create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_append: is_open_append

    	make_open_read_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for both reading and writing.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	make_open_write (fn: STRING_8)
    			-- Create file object with `fn' as file name
    			-- and open file for writing;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			string_exists: fn /= Void
    			string_not_empty: not fn.is_empty
    		ensure -- from FILE
    			file_named: name = fn
    			exists: exists
    			open_write: is_open_write

    feature -- Access

    	access_date: INTEGER_32
    			-- Time stamp of last access made to the inode.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	date: INTEGER_32
    			-- Time stamp (time of last modification)
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	descriptor: INTEGER_32
    			-- File descriptor as used by the operating system.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			valid_handle: descriptor_available
    		require else -- from FILE
    			file_opened: not is_closed

    	descriptor_available: BOOLEAN
    			-- (from FILE)

    	file_info: UNIX_FILE_INFO
    			-- Collected information about the file.
    			-- (from FILE)

    	file_pointer: POINTER
    			-- File pointer as required in C
    			-- (from FILE)

    	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)

    	group_id: INTEGER_32
    			-- Group identification of owner
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	has (v: like item): BOOLEAN
    			-- Does structure include an occurrence of `v'?
    			-- (Reference or object equality,
    			-- based on object_comparison.)
    			-- (from LINEAR)
    		require -- from  CONTAINER
    			True
    		ensure -- from CONTAINER
    			not_found_in_empty: Result implies not is_empty

    	index_of (v: like item; i: INTEGER_32): INTEGER_32
    			-- Index of `i'-th occurrence of `v'.
    			-- 0 if none.
    			-- (Reference or object equality,
    			-- based on object_comparison.)
    			-- (from LINEAR)
    		require -- from LINEAR
    			positive_occurrences: i > 0
    		ensure -- from LINEAR
    			non_negative_result: Result >= 0

    	inode: INTEGER_32
    			-- I-node number
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	item: CHARACTER_8
    			-- Current item
    			-- (from FILE)
    		require -- from TRAVERSABLE
    			not_off: not off
    		require -- from ACTIVE
    			readable: readable

    	links: INTEGER_32
    			-- Number of links on file
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	name: STRING_8
    			-- File name
    			-- (from FILE)

    	occurrences (v: like item): INTEGER_32
    			-- Number of times `v' appears.
    			-- (Reference or object equality,
    			-- based on object_comparison.)
    			-- (from LINEAR)
    		require -- from  BAG
    			True
    		ensure -- from BAG
    			non_negative_occurrences: Result >= 0

    	owner_name: STRING_8
    			-- Name of owner
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	position: INTEGER_32
    			-- Current cursor position.
    			-- (from FILE)
    		require -- from  LINEAR
    			True

    	protection: INTEGER_32
    			-- Protection mode, in decimal value
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	retrieved: ANY
    			-- Retrieved object structure
    			-- To access resulting object under correct type,
    			-- use assignment attempt.
    			-- Will raise an exception (code `Retrieve_exception')
    			-- if content is not a stored Eiffel structure.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    			support_storable: support_storable
    		ensure -- from IO_MEDIUM
    			result_exists: Result /= Void

    	separator: CHARACTER_8
    			-- ASCII code of character following last word read
    			-- (from FILE)

    	user_id: INTEGER_32
    			-- User identification of owner
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    feature -- Measurement

    	count: INTEGER_32
    			-- Size in bytes (0 if no associated physical file)
    			-- (from FILE)

    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

    	same_file (fn: STRING_8): BOOLEAN
    			-- Is current file the same as `a_filename'?
    			-- (from FILE)
    		require -- from FILE
    			fn_not_void: fn /= Void
    			fn_not_empty: not fn.is_empty

    	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

    	access_exists: BOOLEAN
    			-- Does physical file exist?
    			-- (Uses real UID.)
    			-- (from FILE)

    	after: BOOLEAN
    			-- Is there no valid cursor position to the right of cursor position?
    			-- (from FILE)

    	before: BOOLEAN
    			-- Is there no valid cursor position to the left of cursor position?
    			-- (from FILE)

    	bytes_read: INTEGER_32
    			-- Last number of bytes read by read_to_managed_pointer.
    			-- (from IO_MEDIUM)

    	changeable_comparison_criterion: BOOLEAN
    			-- May object_comparison be changed?
    			-- (Answer: yes by default.)
    			-- (from CONTAINER)

    	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

    	end_of_file: BOOLEAN
    			-- Has an EOF been detected?
    			-- (from FILE)
    		require -- from FILE
    			opened: not is_closed

    	exhausted: BOOLEAN
    			-- Has structure been completely explored?
    			-- (from LINEAR)
    		ensure -- from LINEAR
    			exhausted_when_off: off implies Result

    	exists: BOOLEAN
    			-- Does physical file exist?
    			-- (Uses effective UID.)
    			-- (from FILE)
    		require -- from  IO_MEDIUM
    			True
    		ensure then -- from FILE
    			unchanged_mode: mode = old mode

    	extendible: BOOLEAN
    			-- May new items be added?
    			-- (from FILE)
    		require -- from  IO_MEDIUM
    			True
    		require -- from  COLLECTION
    			True

    	file_readable: BOOLEAN
    			-- Is there a current item that may be read?
    			-- (from FILE)

    	file_writable: BOOLEAN
    			-- Is there a current item that may be modified?
    			-- (from FILE)

    	full: BOOLEAN is False
    			-- Is structure filled to capacity?
    			-- (from FILE)

    	is_access_executable: BOOLEAN
    			-- Is file executable by real UID?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_access_owner: BOOLEAN
    			-- Is file owned by real UID?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_access_readable: BOOLEAN
    			-- Is file readable by real UID?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_access_writable: BOOLEAN
    			-- Is file writable by real UID?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_block: BOOLEAN
    			-- Is file a block special file?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_character: BOOLEAN
    			-- Is file a character special file?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_closed: BOOLEAN
    			-- Is file closed?
    			-- (from FILE)

    	is_creatable: BOOLEAN
    			-- Is file creatable in parent directory?
    			-- (Uses effective UID to check that parent is writable
    			-- and file does not exist.)
    			-- (from FILE)

    	is_device: BOOLEAN
    			-- Is file a device?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_directory: BOOLEAN
    			-- Is file a directory?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_empty: BOOLEAN
    			-- Is structure empty?
    			-- (from FINITE)
    		require -- from  CONTAINER
    			True

    	is_executable: BOOLEAN
    			-- Is file executable?
    			-- (Checks execute permission for effective UID.)
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			handle_exists: exists

    	is_fifo: BOOLEAN
    			-- Is file a named pipe?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_inserted (v: CHARACTER_8): BOOLEAN
    			-- Has `v' been inserted by the most recent insertion?
    			-- (By default, the value returned is equivalent to calling
    			-- `has (v)'. However, descendants might be able to provide more
    			-- efficient implementations.)
    			-- (from COLLECTION)

    	is_open_append: BOOLEAN
    			-- Is file open for appending?
    			-- (from FILE)

    	is_open_read: BOOLEAN
    			-- Is file open for reading?
    			-- (from FILE)

    	is_open_write: BOOLEAN
    			-- Is file open for writing?
    			-- (from FILE)

    	is_owner: BOOLEAN
    			-- Is file owned by effective UID?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_plain: BOOLEAN
    			-- Is file a plain file?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_plain_text: BOOLEAN
    			-- Is file reserved for text (character sequences)? (Yes)

    	is_readable: BOOLEAN
    			-- Is file readable?
    			-- (Checks permission for effective UID.)
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			handle_exists: exists

    	is_setgid: BOOLEAN
    			-- Is file setgid?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_setuid: BOOLEAN
    			-- Is file setuid?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_socket: BOOLEAN
    			-- Is file a named socket?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_sticky: BOOLEAN
    			-- Is file sticky (for memory swaps)?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_symlink: BOOLEAN
    			-- Is file a symbolic link?
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	is_writable: BOOLEAN
    			-- Is file writable?
    			-- (Checks write permission for effective UID.)
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			handle_exists: exists

    	last_character: CHARACTER_8
    			-- Last character read by read_character
    			-- (from IO_MEDIUM)

    	last_double: REAL_64
    			-- Last double read by read_double
    			-- (from IO_MEDIUM)

    	last_integer: INTEGER_32
    			-- Last integer read by read_integer
    			-- (from IO_MEDIUM)

    	last_integer_16: INTEGER_16
    			-- Last 16-bit integer read by read_integer_16
    			-- (from IO_MEDIUM)

    	last_integer_32: INTEGER_32
    			-- Synonymy of last_integer
    			-- (from IO_MEDIUM)

    	last_integer_64: INTEGER_64
    			-- Last 64-bit integer read by read_integer_64
    			-- (from IO_MEDIUM)

    	last_integer_8: INTEGER_8
    			-- Last 8-bit integer read by read_integer_8
    			-- (from IO_MEDIUM)

    	last_natural: NATURAL_32
    			-- Last 32-bit natural read by read_natural
    			-- (from IO_MEDIUM)

    	last_natural_16: NATURAL_16
    			-- Last 16-bit natural read by read_natural_16
    			-- (from IO_MEDIUM)

    	last_natural_32: NATURAL_32
    			-- Synonymy of last_natural
    			-- (from IO_MEDIUM)

    	last_natural_64: NATURAL_64
    			-- Last 64-bit natural read by read_natural_64
    			-- (from IO_MEDIUM)

    	last_natural_8: NATURAL_8
    			-- Last 8-bit natural read by read_natural_8
    			-- (from IO_MEDIUM)

    	last_real: REAL_32
    			-- Last real read by read_real
    			-- (from IO_MEDIUM)

    	last_string: STRING_8
    			-- Last string read
    			-- (from IO_MEDIUM)

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

    	off: BOOLEAN
    			-- Is there no item?
    			-- (from FILE)
    		require -- from  TRAVERSABLE
    			True

    	path_exists: BOOLEAN
    			-- Does physical file name exist without resolving
    			-- symbolic links?
    			-- (from FILE)
    		ensure then -- from FILE
    			unchanged_mode: mode = old mode

    	prunable: BOOLEAN
    			-- Is there an item to be removed?
    			-- (from FILE)

    	readable: BOOLEAN
    			-- Is there a current item that may be read?
    			-- (from SEQUENCE)
    		require -- from  ACTIVE
    			True
    		require -- from IO_MEDIUM
    			handle_exists: exists

    	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))

    	support_storable: BOOLEAN is False
    			-- Can medium be used to store an Eiffel structure?

    	writable: BOOLEAN
    			-- Is there a current item that may be modified?
    			-- (from SEQUENCE)

    feature -- Status setting

    	close
    			-- Close file.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			medium_is_open: not is_closed
    		ensure then -- from FILE
    			is_closed: is_closed

    	compare_objects
    			-- Ensure that future search operations will use equal
    			-- rather than `=' for comparing references.
    			-- (from CONTAINER)
    		require -- from CONTAINER
    			changeable_comparison_criterion: changeable_comparison_criterion
    		ensure -- from CONTAINER
    			object_comparison

    	compare_references
    			-- Ensure that future search operations will use `='
    			-- rather than equal for comparing references.
    			-- (from CONTAINER)
    		require -- from CONTAINER
    			changeable_comparison_criterion: changeable_comparison_criterion
    		ensure -- from CONTAINER
    			reference_comparison: not object_comparison

    	create_read_write
    			-- Open file in read and write mode;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_closed: is_closed
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	fd_open_append (fd: INTEGER_32)
    			-- Open file of descriptor `fd' in append mode.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_append: is_open_append

    	fd_open_read (fd: INTEGER_32)
    			-- Open file of descriptor `fd' in read-only mode.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read

    	fd_open_read_append (fd: INTEGER_32)
    			-- Open file of descriptor `fd'
    			-- in read and write-at-end mode.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_append: is_open_append

    	fd_open_read_write (fd: INTEGER_32)
    			-- Open file of descriptor `fd' in read-write mode.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	fd_open_write (fd: INTEGER_32)
    			-- Open file of descriptor `fd' in write mode.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_write: is_open_write

    	open_append
    			-- Open file in append-only mode;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_closed: is_closed
    		ensure -- from FILE
    			exists: exists
    			open_append: is_open_append

    	open_read
    			-- Open file in read-only mode.
    			-- (from FILE)
    		require -- from FILE
    			is_closed: is_closed
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read

    	open_read_append
    			-- Open file in read and write-at-end mode;
    			-- create it if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_closed: is_closed
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_append: is_open_append

    	open_read_write
    			-- Open file in read and write mode.
    			-- (from FILE)
    		require -- from FILE
    			is_closed: is_closed
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	open_write
    			-- Open file in write-only mode;
    			-- create it if it does not exist.
    			-- (from FILE)
    		ensure -- from FILE
    			exists: exists
    			open_write: is_open_write

    	recreate_read_write (fname: STRING_8)
    			-- Reopen in read-write mode with file of name `fname';
    			-- create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	reopen_append (fname: STRING_8)
    			-- Reopen in append mode with file of name `fname';
    			-- create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_append: is_open_append

    	reopen_read (fname: STRING_8)
    			-- Reopen in read-only mode with file of name `fname';
    			-- create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read

    	reopen_read_append (fname: STRING_8)
    			-- Reopen in read and write-at-end mode with file
    			-- of name `fname'; create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_append: is_open_append

    	reopen_read_write (fname: STRING_8)
    			-- Reopen in read-write mode with file of name `fname'.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_read: is_open_read
    			open_write: is_open_write

    	reopen_write (fname: STRING_8)
    			-- Reopen in write-only mode with file of name `fname';
    			-- create file if it does not exist.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed
    			valid_name: fname /= Void
    		ensure -- from FILE
    			exists: exists
    			open_write: is_open_write

    feature -- Cursor movement

    	back
    			-- Go back one position.
    			-- (from FILE)
    		require -- from BILINEAR
    			not_before: not before

    	finish
    			-- Go to last position.
    			-- (from FILE)
    		require -- from  LINEAR
    			True
    		require else -- from FILE
    			file_opened: not is_closed

    	forth
    			-- Go to next position.
    			-- (from FILE)
    		require -- from LINEAR
    			not_after: not after
    		require else -- from FILE
    			file_opened: not is_closed

    	go (abs_position: INTEGER_32)
    			-- Go to the absolute position.
    			-- (New position may be beyond physical length.)
    			-- (from FILE)
    		require -- from FILE
    			file_opened: not is_closed
    			non_negative_argument: abs_position >= 0

    	move (offset: INTEGER_32)
    			-- Advance by `offset' from current location.
    			-- (from FILE)
    		require -- from FILE
    			file_opened: not is_closed

    	next_line
    			-- Move to next input line.
    			-- (from FILE)
    		require -- from FILE
    			is_readable: file_readable

    	recede (abs_position: INTEGER_32)
    			-- Go to the absolute position backwards,
    			-- starting from end of file.
    			-- (from FILE)
    		require -- from FILE
    			file_opened: not is_closed
    			non_negative_argument: abs_position >= 0

    	search (v: like item)
    			-- Move to first position (at or after current
    			-- position) where item and `v' are equal.
    			-- If structure does not include `v' ensure that
    			-- exhausted will be true.
    			-- (Reference or object equality,
    			-- based on object_comparison.)
    			-- (from BILINEAR)
    		ensure -- from LINEAR
    			object_found: (not exhausted and object_comparison) implies equal (v, item)
    			item_found: (not exhausted and not object_comparison) implies v = item

    	start
    			-- Go to first position.
    			-- (from FILE)
    		require -- from  TRAVERSABLE
    			True
    		require else -- from FILE
    			file_opened: not is_closed

    feature -- Element change

    	add_permission (who, what: STRING_8)
    			-- Add read, write, execute or setuid permission
    			-- for `who' ('u', 'g' or 'o') to `what'.
    			-- (from FILE)
    		require -- from FILE
    			who_is_not_void: who /= Void
    			what_is_not_void: what /= Void
    			file_descriptor_exists: exists

    	append (f: like Current)
    			-- Append a copy of the contents of `f'.
    			-- (from FILE)
    		require -- from SEQUENCE
    			argument_not_void: f /= Void
    		require else -- from FILE
    			target_is_closed: is_closed
    			source_is_closed: f.is_closed
    		ensure -- from SEQUENCE
    			new_count: count >= old count
    		ensure then -- from FILE
    			new_count: count = old count + f.count
    			files_closed: f.is_closed and is_closed

    	basic_store (object: ANY)
    			-- Produce an external representation of the
    			-- entire object structure reachable from `object'.
    			-- Retrievable within current system only.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			object_not_void: object /= Void
    			extendible: extendible
    			support_storable: support_storable

    	change_date: INTEGER_32
    			-- Time stamp of last change.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	change_group (new_group_id: INTEGER_32)
    			-- Change group of file to `new_group_id' found in
    			-- system password file.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	change_mode (mask: INTEGER_32)
    			-- Replace mode by `mask'.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	change_name (new_name: STRING_8)
    			-- Change file name to `new_name'
    			-- (from FILE)
    		require -- from FILE
    			new_name_not_void: new_name /= Void
    			new_name_not_empty: not new_name.is_empty
    			file_exists: exists
    		ensure -- from FILE
    			name_changed: name.is_equal (new_name)

    	change_owner (new_owner_id: INTEGER_32)
    			-- Change owner of file to `new_owner_id' found in
    			-- system password file. On some systems this
    			-- requires super-user privileges.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	extend (v: CHARACTER_8)
    			-- Include `v' at end.
    			-- (from FILE)
    		require -- from COLLECTION
    			extendible: extendible
    		ensure -- from COLLECTION
    			item_inserted: is_inserted (v)
    		ensure then -- from BAG
    			one_more_occurrence: occurrences (v) = old (occurrences (v)) + 1

    	fill (other: CONTAINER [CHARACTER_8])
    			-- Fill with as many items of `other' as possible.
    			-- The representations of `other' and current structure
    			-- need not be the same.
    			-- (from COLLECTION)
    		require -- from COLLECTION
    			other_not_void: other /= Void
    			extendible: extendible

    	flush
    			-- Flush buffered data to disk.
    			-- Note that there is no guarantee that the operating
    			-- system will physically write the data to the disk.
    			-- At least it will end up in the buffer cache,
    			-- making the data visible to other processes.
    			-- (from FILE)
    		require -- from FILE
    			is_open: not is_closed

    	force (v: like item)
    			-- Add `v' to end.
    			-- (from SEQUENCE)
    		require -- from SEQUENCE
    			extendible: extendible
    		ensure then -- from SEQUENCE
    			new_count: count = old count + 1
    			item_inserted: has (v)

    	general_store (object: ANY)
    			-- Produce an external representation of the
    			-- entire object structure reachable from `object'.
    			-- Retrievable from other systems for same platform
    			-- (machine architecture).
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			object_not_void: object /= Void
    			extendible: extendible
    			support_storable: support_storable

    	independent_store (object: ANY)
    			-- Produce an external representation of the
    			-- entire object structure reachable from `object'.
    			-- Retrievable from other systems for the same or other
    			-- platform (machine architecture).
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			object_not_void: object /= Void
    			extendible: extendible
    			support_storable: support_storable

    	link (fn: STRING_8)
    			-- Link current file to `fn'.
    			-- `fn' must not already exist.
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists

    	new_line
    			-- Write a new line character at current position.
    			-- Was declared in FILE as synonym of put_new_line.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put (v: like item)
    			-- Add `v' to end.
    			-- (from SEQUENCE)
    		require -- from COLLECTION
    			extendible: extendible
    		ensure -- from COLLECTION
    			item_inserted: is_inserted (v)
    		ensure then -- from SEQUENCE
    			new_count: count = old count + 1

    	put_character (c: CHARACTER_8)
    			-- Write `c' at current position.
    			-- Was declared in FILE as synonym of putchar.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_managed_pointer (p: MANAGED_POINTER; start_pos, nb_bytes: INTEGER_32)
    			-- Put data of length `nb_bytes' pointed by `start_pos' index in `p' at
    			-- current position.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			p_not_void: p /= Void
    			p_large_enough: p.count >= nb_bytes + start_pos
    			nb_bytes_non_negative: nb_bytes >= 0
    			extendible: extendible

    	put_new_line
    			-- Write a new line character at current position.
    			-- Was declared in FILE as synonym of new_line.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_string (s: STRING_8)
    			-- Write `s' at current position.
    			-- Was declared in FILE as synonym of putstring.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible
    			non_void: s /= Void

    	putchar (c: CHARACTER_8)
    			-- Write `c' at current position.
    			-- Was declared in FILE as synonym of put_character.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible

    	putstring (s: STRING_8)
    			-- Write `s' at current position.
    			-- Was declared in FILE as synonym of put_string.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			extendible: extendible
    			non_void: s /= Void

    	remove_permission (who, what: STRING_8)
    			-- Remove read, write, execute or setuid permission
    			-- for `who' ('u', 'g' or 'o') to `what'.
    			-- (from FILE)
    		require -- from FILE
    			who_is_not_void: who /= Void
    			what_is_not_void: what /= Void
    			file_descriptor_exists: exists

    	set_access (time: INTEGER_32)
    			-- Stamp with `time' (access only).
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists
    		ensure -- from FILE
    			acess_date_updated: access_date = time
    			date_unchanged: date = old date

    	set_date (time: INTEGER_32)
    			-- Stamp with `time' (modification time only).
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists
    		ensure -- from FILE
    			access_date_unchanged: access_date = old access_date
    			date_updated: date = time

    	stamp (time: INTEGER_32)
    			-- Stamp with `time' (for both access and modification).
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists
    		ensure -- from FILE
    			date_updated: date = time

    	touch
    			-- Update time stamp (for both access and modification).
    			-- (from FILE)
    		require -- from FILE
    			file_exists: exists
    		ensure -- from FILE
    			date_changed: date /= old date

    feature -- Removal

    	delete
    			-- Remove link with physical file.
    			-- File does not physically disappear from the disk
    			-- until no more processes reference it.
    			-- I/O operations on it are still possible.
    			-- A directory must be empty to be deleted.
    			-- (from FILE)
    		require -- from FILE
    			exists: exists

    	dispose
    			-- Ensure this medium is closed when garbage collected.
    			-- (from IO_MEDIUM)

    	prune_all (v: like item)
    			-- Remove all occurrences of `v'; go off.
    			-- (from SEQUENCE)
    		require -- from COLLECTION
    			prunable: prunable
    		ensure -- from COLLECTION
    			no_more_occurrences: not has (v)

    	reset (fn: STRING_8)
    			-- Change file name to `fn' and reset
    			-- file descriptor and all information.
    			-- (from FILE)
    		require -- from FILE
    			valid_file_name: fn /= Void
    		ensure -- from FILE
    			file_renamed: name = fn
    			file_closed: is_closed

    	wipe_out
    			-- Remove all items.
    			-- (from FILE)
    		require -- from COLLECTION
    			prunable: prunable
    		require else -- from FILE
    			is_closed: is_closed
    		ensure -- from COLLECTION
    			wiped_out: is_empty

    feature -- Conversion

    	linear_representation: LINEAR [CHARACTER_8]
    			-- Representation as a linear structure
    			-- (from LINEAR)
    		require -- from  CONTAINER
    			True

    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 -- Obsolete

    	lastchar: CHARACTER_8
    			-- Last character read by read_character
    			-- (from IO_MEDIUM)

    	lastdouble: REAL_64
    			-- Last double read by read_double
    			-- (from IO_MEDIUM)

    	lastint: INTEGER_32
    			-- Last integer read by read_integer
    			-- (from IO_MEDIUM)

    	lastreal: REAL_32
    			-- Last real read by read_real
    			-- (from IO_MEDIUM)

    	laststring: STRING_8
    			-- Last string read
    			-- (from IO_MEDIUM)

    feature -- Convenience

    	copy_to (file: like Current)
    			-- Copy content of current from current cursor
    			-- position to end of file into `file' from
    			-- current cursor position of `file'.
    			-- (from FILE)
    		require -- from FILE
    			file_not_void: file /= Void
    			file_is_open_write: file.is_open_write
    			current_is_open_read: is_open_read

    feature -- Input

    	read_character
    			-- Read a new character.
    			-- Make result available in last_character.
    			-- Was declared in FILE as synonym of readchar.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	read_double
    			-- Read the ASCII representation of a new double
    			-- from file. Make result available in last_double.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of readdouble.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	read_integer
    			-- Read the ASCII representation of a new 32-bit integer
    			-- from file. Make result available in last_integer.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of readint and read_integer_32.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	read_integer_16
    			-- Read the ASCII representation of a new 16-bit integer
    			-- from file. Make result available in last_integer_16.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_integer_32
    			-- Read the ASCII representation of a new 32-bit integer
    			-- from file. Make result available in last_integer.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_integer and readint.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_integer_64
    			--
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_integer_8
    			-- Read the ASCII representation of a new 8-bit integer
    			-- from file. Make result available in last_integer_8.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_line
    			-- Read a string until new line or end of file.
    			-- Make result available in last_string.
    			-- New line will be consumed but not part of last_string.
    			-- Was declared in FILE as synonym of readline.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable
    		ensure -- from IO_MEDIUM
    			last_string_not_void: last_string /= Void

    	read_natural
    			-- Read the ASCII representation of a new 32-bit natural
    			-- from file. Make result available in last_natural.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_natural_32.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_natural_16
    			-- Read the ASCII representation of a new 16-bit natural
    			-- from file. Make result available in last_natural_16.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_natural_32
    			-- Read the ASCII representation of a new 32-bit natural
    			-- from file. Make result available in last_natural.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_natural.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_natural_64
    			-- Read the ASCII representation of a new 64-bit natural
    			-- from file. Make result available in last_natural_64.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_natural_8
    			-- Read the ASCII representation of a new 8-bit natural
    			-- from file. Make result available in last_natural_8.
    		require -- from IO_MEDIUM
    			is_readable: readable

    	read_real
    			-- Read the ASCII representation of a new real
    			-- from file. Make result available in last_real.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of readreal.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	read_stream (nb_char: INTEGER_32)
    			-- Read a string of at most `nb_char' bound characters
    			-- or until end of file.
    			-- Make result available in last_string.
    			-- Was declared in FILE as synonym of readstream.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable
    		ensure -- from IO_MEDIUM
    			last_string_not_void: last_string /= Void

    	read_to_managed_pointer (p: MANAGED_POINTER; start_pos, nb_bytes: INTEGER_32)
    			-- Read at most `nb_bytes' bound bytes and make result
    			-- available in `p' at position `start_pos'.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			p_not_void: p /= Void
    			p_large_enough: p.count >= nb_bytes + start_pos
    			nb_bytes_non_negative: nb_bytes >= 0
    			is_readable: readable
    		require else -- from FILE
    			p_not_void: p /= Void
    			p_large_enough: p.count >= nb_bytes + start_pos
    			is_readable: file_readable
    		ensure -- from IO_MEDIUM
    			bytes_read_non_negative: bytes_read >= 0
    			bytes_read_not_too_big: bytes_read <= nb_bytes

    	read_word
    			-- Read a string, excluding white space and stripping
    			-- leading white space.
    			-- Make result available in last_string.
    			-- White space characters are: blank, new_line, tab,
    			-- vertical tab, formfeed, end of file.
    			-- Was declared in FILE as synonym of readword.
    			-- (from FILE)
    		require -- from FILE
    			is_readable: file_readable
    		ensure -- from FILE
    			last_string_not_void: last_string /= Void

    	readchar
    			-- Read a new character.
    			-- Make result available in last_character.
    			-- Was declared in FILE as synonym of read_character.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	readdouble
    			-- Read the ASCII representation of a new double
    			-- from file. Make result available in last_double.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_double.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	readint
    			-- Read the ASCII representation of a new 32-bit integer
    			-- from file. Make result available in last_integer.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_integer and read_integer_32.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	readline
    			-- Read a string until new line or end of file.
    			-- Make result available in last_string.
    			-- New line will be consumed but not part of last_string.
    			-- Was declared in FILE as synonym of read_line.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable
    		ensure -- from IO_MEDIUM
    			last_string_not_void: last_string /= Void

    	readreal
    			-- Read the ASCII representation of a new real
    			-- from file. Make result available in last_real.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of read_real.
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable

    	readstream (nb_char: INTEGER_32)
    			-- Read a string of at most `nb_char' bound characters
    			-- or until end of file.
    			-- Make result available in last_string.
    			-- Was declared in FILE as synonym of read_stream.
    			-- (from FILE)
    		require -- from IO_MEDIUM
    			is_readable: readable
    		require else -- from FILE
    			is_readable: file_readable
    		ensure -- from IO_MEDIUM
    			last_string_not_void: last_string /= Void

    	readword
    			-- Read a string, excluding white space and stripping
    			-- leading white space.
    			-- Make result available in last_string.
    			-- White space characters are: blank, new_line, tab,
    			-- vertical tab, formfeed, end of file.
    			-- Was declared in FILE as synonym of read_word.
    			-- (from FILE)
    		require -- from FILE
    			is_readable: file_readable
    		ensure -- from FILE
    			last_string_not_void: last_string /= Void

    feature -- Iteration

    	do_all (action: PROCEDURE [ANY, TUPLE [CHARACTER_8]])
    			-- Apply `action' to every item.
    			-- Semantics not guaranteed if `action' changes the structure;
    			-- in such a case, apply iterator to clone of structure instead.
    			-- (from LINEAR)
    		require -- from TRAVERSABLE
    			action_exists: action /= Void

    	do_if (action: PROCEDURE [ANY, TUPLE [CHARACTER_8]]; test: FUNCTION [ANY, TUPLE [CHARACTER_8], BOOLEAN])
    			-- Apply `action' to every item that satisfies `test'.
    			-- Semantics not guaranteed if `action' or `test' changes the structure;
    			-- in such a case, apply iterator to clone of structure instead.
    			-- (from LINEAR)
    		require -- from TRAVERSABLE
    			action_exists: action /= Void
    			test_exits: test /= Void

    	for_all (test: FUNCTION [ANY, TUPLE [CHARACTER_8], BOOLEAN]): BOOLEAN
    			-- Is `test' true for all items?
    			-- Semantics not guaranteed if `test' changes the structure;
    			-- in such a case, apply iterator to clone of structure instead.
    			-- (from LINEAR)
    		require -- from TRAVERSABLE
    			test_exits: test /= Void
    		ensure then -- from LINEAR
    			empty: is_empty implies Result

    	there_exists (test: FUNCTION [ANY, TUPLE [CHARACTER_8], BOOLEAN]): BOOLEAN
    			-- Is `test' true for at least one item?
    			-- Semantics not guaranteed if `test' changes the structure;
    			-- in such a case, apply iterator to clone of structure instead.
    			-- (from LINEAR)
    		require -- from TRAVERSABLE
    			test_exits: test /= Void

    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)

    	put_boolean (b: BOOLEAN)
    			-- Write ASCII value of `b' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of putbool.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_double (d: REAL_64)
    			-- Write ASCII value `d' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of putdouble.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_integer (i: INTEGER_32)
    			-- Write ASCII value of `i' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of putint and put_integer_32.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_integer_16 (i: INTEGER_16)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_integer_32 (i: INTEGER_32)
    			-- Write ASCII value of `i' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_integer and putint.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_integer_64 (i: INTEGER_64)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_integer_8 (i: INTEGER_8)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_natural (i: NATURAL_32)
    			-- Write ASCII value of `i' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_natural_32.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_natural_16 (i: NATURAL_16)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_natural_32 (i: NATURAL_32)
    			-- Write ASCII value of `i' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_natural.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_natural_64 (i: NATURAL_64)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_natural_8 (i: NATURAL_8)
    			-- Write ASCII value of `i' at current position.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	put_real (r: REAL_32)
    			-- Write ASCII value of `r' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of putreal.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	putbool (b: BOOLEAN)
    			-- Write ASCII value of `b' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_boolean.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	putdouble (d: REAL_64)
    			-- Write ASCII value `d' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_double.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	putint (i: INTEGER_32)
    			-- Write ASCII value of `i' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_integer and put_integer_32.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	putreal (r: REAL_32)
    			-- Write ASCII value of `r' at current position.
    			-- Was declared in PLAIN_TEXT_FILE as synonym of put_real.
    		require -- from IO_MEDIUM
    			extendible: extendible

    	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)

    invariant
    	plain_text: is_plain_text

    		-- from FILE
    	valid_mode: closed_file <= mode and mode <= append_read_file
    	name_exists: name /= Void
    	name_not_empty: not name.is_empty

    		-- from FINITE
    	empty_definition: is_empty = (count = 0)
    	non_negative_count: count >= 0

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

    		-- from ACTIVE
    	writable_constraint: writable implies readable
    	empty_constraint: is_empty implies (not readable) and (not writable)

    		-- from BILINEAR
    	not_both: not (after and before)
    	before_constraint: before implies off

    		-- from LINEAR
    	after_constraint: after implies off

    		-- from TRAVERSABLE
    	empty_constraint: is_empty implies off

    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 PLAIN_TEXT_FILE