From: christophe mckeon <polypus@...>
Date: 2006-06-21T06:32:43+09:00
Subject: Re: binary operators, coerce, and non numeric types


ok i hadn't fully grokked coerce, and have found a solution. just incase 
anybody is interested:

class X

  def + other
    bin_op other, :+
  end
  def ** other
    bin_op other, :**
  end
  def - other
    bin_op other, :-
  end
  def / other
    bin_op other, :/
  end

  def bin_op other, op
    if @coerced
      @coerced = false
      BinOp.new other, self, op
    else
      BinOp.new self, other, op
    end
  end

  def coerce other
    @coerced = true
    [self,other]
  end

end

class BinOp
  def initialize x,y,op
    @x, @y, @op = x, y, op
  end
  def to_s
    "BinOp #@x #@op #@y"
  end
end

x = X.new

puts x + 3
puts 3.0 + x
puts 2 - x
puts x - 10
puts 23 ** x
puts 2.99 / x
puts x / -1

cheers,
_c


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