From: Robert Klemme <shortcutter@...>
Date: 2010-11-03T17:22:12+09:00
Subject: Re: the dark side of inherited methods

On Tue, Nov 2, 2010 at 7:51 PM, James Edward Gray II
<james@graysoftinc.com> wrote:
> On Nov 2, 2010, at 1:25 PM, Joel VanderWerf wrote:
>
>> On 11/02/2010 11:12 AM, James Edward Gray II wrote:
>>>   A = Struct.new(:x, :y, :z) do
>>>     def length
>>>       Math.sqrt(x**2 + y**2 + z**2)
>>>     end
>>>   end
>>
>> How do you fix this?
>>
>> A = Struct.new :x, :y, :z do
>>  def length
>>    Math.sqrt(x**2 + y**2 + z**2)
>>  end
>>
>>  def x=(new_x)
>>    raise ArgumentError if new_x > 100
>>    super
>>  end
>> end
>>
>> a = A.new
>> a.x = 1 # NoMethodError
>
> Good question.  It works to replace super with:
>
>  self[:x] = new_x
>
> I realize that's not an ideal solution though.

... as is wasting a class because one wants to spare the typing IMHO. :-)

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
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