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indexing
	description: "Two-dimensional arrays"
	status: "See notice at end of class"
	names: array2, matrix, table
	representation: array
	access: index, row_and_column, membership
	size: resizable
	contents: generic
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class interface
	ARRAY2 [G]

create 
	make

feature -- Initialization

	make (nb_rows, nb_columns: INTEGER)
			-- Create a two dimensional array which has nb_rows
			-- rows and nb_columns columns,
			-- with lower bounds starting at 1.
		require
			not_flat: nb_rows > 0
			not_thin: nb_columns > 0
		ensure
			new_count: count = height * width

	initialize (v: G)
			-- Make each entry have value v.
	
feature -- Access

	item (row, column: INTEGER): G
			-- Entry at coordinates (row, column)
		require
			valid_row: (1 <= row) and (row <= height)
			valid_column: (1 <= column) and (column <= width)
	
feature -- Measurement

	height: INTEGER
			-- Number of rows

	width: INTEGER
			-- Number of columns
	
feature -- Element change

	put (v: like item; row, column: INTEGER)
			-- Assign item v at coordinates (row, column).
		require
			valid_row: 1 <= row and row <= height
			valid_column: 1 <= column and column <= width

	force (v: like item; row, column: INTEGER)
			-- Assign item v at coordinates (row, column).
			-- Resize if necessary.
		require
			row_large_enough: 1 <= row
			column_large_enough: 1 <= column
	
feature -- Removal

	wipe_out
			-- Remove all items.
	
feature -- Resizing

	resize (nb_rows, nb_columns: INTEGER)
			-- Rearrange array so that it can accommodate
			-- nb_rows rows and nb_columns columns,
			-- without losing any previously
			-- entered items, nor changing their coordinates;
			-- do nothing if not possible.
		require
			valid_row: nb_rows >= 1
			valid_column: nb_columns >= 1
	
invariant

	items_number: count = width * height

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class ARRAY2


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