From: Ara.T.Howard@...
Date: 2004-11-06T01:03:45+09:00
Subject: Re: value provided for argument with default value - how to check inside method?

On Fri, 5 Nov 2004, itsme213 wrote:

>
> "Robert Klemme" <bob.news@gmx.net> wrote
>> I'm unsure what you're at.  Normally the idea of having a default value is
>> that you don't have to worry about where it came from:
>>
>> def foo(x=10)
>>   puts x
>> end
>>
>> Care to unveil a bit more detail why you would need that piece of
>> information?
>
> In this case, I want to use foo() and foo(x) as getter and setter
> respectively i.e. some form of overloading.

how about something like this


   harp:~ > cat a.rb
   class C
     DEFAULT_X = 42
     class << self
       def init
         @x = DEFAULT_X
       end
       def x arg = @x
         @x = arg
       end
     end
     self.init
     def initialize
       @x = self.class.x
     end
     def x arg = @x
       @x = arg
     end
   end

   c0 = C::new
   p c0.x
   c0.x 'forty-two'
   p c0.x

   C::x 'forty-two'  # configure the class
   c1 = C::new
   p c1.x
   c1.x 42
   p c1.x


   harp:~ > ruby a.rb
   42
   "forty-two"
   "forty-two"
   42


regards.

-a
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