From: David Vallner <david@...>
Date: 2006-04-10T04:05:33+09:00
Subject: Re: Dumb reflection problem - create object from String

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D=C5=88a Nede=C4=BEa 9. Apr=C3=ADl 2006 20:26 Gyoung-Yoon Noh nap=C3=ADsal:
> On 4/10/06, Brian Parkinson <parkI@whatevernot.com> wrote:
> > Hello - I'm bashing my head against the wall - I'm sure this is a simple
> > question, but damned if I can figure it out.
> >
> > If I have a String which corresponds to a class name, how do I create an
> > instance of this class?
> >
> > Example:
> >
> > class MyExampleClass
> >     ...
> > end
> >
> > s =3D 'MyExampleClass'
> >
> > # We want to instantiate a new instance of the class
> > myExampleClassInstance =3D ???
> >
> > I want the behaviour of 'MyExampleClass.new' but only using the String
> > value of s.
> >
> > I'm sure it's a one-liner.
> >
> > Any help appreciated.
> >
> > Thanks.
> >
> > parki...
> >
> >
> > --
> > Posted via http://www.ruby-forum.com/.
>
> $ irb
> irb(main):001:0> class K
> irb(main):002:1> end
> =3D> nil
> irb(main):003:0> k1 =3D K.new
> =3D> #<K:0xb7fc1788>
> irb(main):004:0> k2 =3D eval('K').new
> =3D> #<K:0xb7fb8094>
> irb(main):005:0> k3 =3D Object.const_get('K').new
> =3D> #<K:0xb7fb1474>
>
> --
> http://nohmad.sub-port.net

I would, naively hoping to see YARV released Sometime Soon (tm), rather use=
=20
<anything but eval>, since it probably is / will be easier for YARV to work=
=20
with <anything but eval>, as far as optimizations are concerned. It also=20
makes the intent of the code clearer.

David Vallner

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