From: mark sparshatt <msparshatt@...>
Date: 2005-05-03T02:49:45+09:00
Subject: Re: enum in ruby ?

Andreas Habel wrote:
> Hi,
> 
> I`ve a simple question about constants in ruby. Is there a possibility 
> to define constants in a module or a class like a enum in c?
> 
> Maybe something short like the 'attr_accessor' syntax would be great!
> 
> class MyClass
>   const_def    :CONST_A1, :CONST_A2, :CONST_A3
>   const_def    :CONST_B1, :CONST_B2, :CONST_B3
> end
> 
> eq.
> 
> class MyClass
> 
>   CONST_A1 = 1
>   CONST_A2 = 2
>   CONST_A3 = 3
> 
>   CONST_B1 = 1
>   CONST_B2 = 2
>   CONST_B3 = 3
> end
> 

The following is a simple implementation of what you want


class Class
   def const_def(*symbols)
     symbols.each_with_index do |symbol, index|
       const_set(symbol, index + 1)
     end
   end
end

class MyClass
   const_def :CONST_A1, :CONST_A2, :CONST_A3

   p CONST_A1, CONST_A2, CONST_A3
end

#=>
1
2
3


HTH

--
Mark Sparshatt