-- AUTHOR: 	E. Burke
-- DATE:	November, 1996
-- PURPOSE: 	Specification for generic grid box and operations
--		needed to play Game of Life
--		Driver program is Life1

with TEXT_IO;

generic

  MAX_ROWS	   :   	POSITIVE;
  MAX_COLUMNS      :    POSITIVE;
  MAX_SIZE         :    POSITIVE;

package GRID is
  type BOARD is array	(1..MAX_ROWS, 1..MAX_COLUMNS) OF Boolean;
  procedure Initialize   (Grid_Box : out BOARD);
  procedure Input 	 (Grid_Box : out BOARD);
  procedure Output	 (Grid_Box : in BOARD);
  procedure Update_Box	 (Grid_Box : in out BOARD);
  function Neighbor_Count (I : NATURAL; J : NATURAL;
                           Grid_Box : BOARD) return NATURAL;
  function Enquire return BOOLEAN;
end GRID;