#
# This file contains the Ruby code from Program 4.7 of
# "Data Structures and Algorithms
# with Object-Oriented Design Patterns in Ruby"
# by Bruno R. Preiss.
#
# Copyright (c) 2004 by Bruno R. Preiss, P.Eng.  All rights reserved.
#
# http://www.brpreiss.com/books/opus8/programs/pgm04_07.txt
#
class Matrix

    def initialize(numberOfRows, numberOfColumns)
	assert { numberOfRows >= 0 }
	assert { numberOfColumns >= 0 }
        @numberOfRows = numberOfRows
        @numberOfColumns = numberOfColumns
    end

    attr_reader :numberOfRows

    attr_reader :numberOfColumns

    abstractmethod :+

    abstractmethod :*

    abstractmethod :transpose

end