From: Robert Dober <robert.dober@...>
Date: 2008-05-28T22:06:02+09:00
Subject: Re: The duck's backside

On Wed, May 28, 2008 at 9:45 AM, Tobias Weber <towb@gmx.net> wrote:
>
The first idea would be to do something like the following

module MyChecker
  MyConstraintError = Class::new RuntimeError

    def make_ivar name, value, *allowedClasses
        raise MyConstraintError, "...." unless
            allowedClasses.any?{ |klass| klass === value }
        instance_variable_set name, value
    end
end

class MyClass
   include MyChecker
   def initialize int_val, str_val, val
      make_ivar :@int, int_val, Integer
      make_ivar :@str, str_val, String
      make_ivar :@var, val, Integer, String
  ....

HTH
Robert


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