From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-09-28T06:54:33+09:00
Subject: Re: Dynamically generating classes?

On Wed, 28 Sep 2005, Jonas Galvez wrote:

> Hi,
>
> In Python I can do this:
>
>>>> def create_class(name):
> ...     import new
> ...     c = new.classobj(name, tuple([object]), {})
> ...     def __init__(self, value):
> ...         self.value = value
> ...     setattr(c, "__init__", new.instancemethod(__init__, None, c))
> ...     return c
> ...
>>>> MyClass = create_class("MyClass")
>>>>
>>>> obj = MyClass(value=10)
>>>> print obj.value
> 10
>
> Is there anything similar in Ruby? Or do I need to use eval()?

much more easily:

   harp:~ > cat a.rb
   klass =
     Class::new {
       def foo
         42
       end
       def bar
         'forty-two'
       end
     }

   k = klass::new
   p k.foo

   MyKlass = klass
   k = MyKlass::new
   p k.bar


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

cheers.



-a
-- 
===============================================================================
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| Your life dwells amoung the causes of death
| Like a lamp standing in a strong breeze.  --Nagarjuna
===============================================================================