// -*- C++ -*-
interface Grid
{
  // = TITLE
  //   Create a <Grid> of type <name>

  attribute short height;
  // Height of the grid.

  attribute short width;
  // Width of the grid.

  exception RANGE_ERROR
    {
      // = TITLE
      // The range of parameter values do not fall in the expected
      // range.
    };

  // = Constants for LOCATIONS and VALUE.
  const short DEFAULT_SIZE = 10;
  const short DEFAULT_VALUE = 1;

  void set (in short n, in short m, in long value)
    raises (RANGE_ERROR);
  // Set the element [n,m] of the grid, to value.

  long get (in short n, in short m)
    raises (RANGE_ERROR);
  // Return element [n,m] of the grid.

  void destroy ();
  // Destroy the grid.
};

interface Grid_Factory
{
  // = TITLE
  //   Factory that creates a <Grid>

  // = Default height and width for a <Grid>.
  const short DEFAULT_HEIGHT = 10;
  const short DEFAULT_WIDTH = 10;

  Grid make_grid (in short height, in short width);
  // Returns a new <Grid> instance.

  void shutdown ();
  // Shutdown the application.

  void cleanup ();
  // Unbind from persistent memory
};