# Defines class JBLAS::ReversedArithmetic which is necessary for expressions
# like "3 - matrix".

# Copyright (c) 2009-2010, Mikio L. Braun and contributors
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module JBLAS 
  # When arguments to arithmetic operators are promoted via coerce, they
  # change their order. This class is a wrapper for the promoted self
  # which has <tt>-</tt> and <tt>/</tt> overloaded to call +rsub+ and
  # +rdiv+ instead of +div+ and +sub+
  class ReversedArithmetic
    def initialize(o)
      @value = o;
    end

    def +(o)
      @value.add o
    end

    def *(o)
      @value.mul o
    end

    def -(o)
      @value.rsub o
    end

    def /(o)
      @value.rdiv o
    end
  end
end