From: Gaspard Bucher <gaspard@...>
Date: 2007-09-25T23:17:58+09:00
Subject: Re: create a class in a class with eval

Thanks for the answer. Works great.

I just changed Module to Object since:
Object.const_set("A", Class.new) ==> A
Module.const_set("A", Class.new) ==> Module::A

2007/9/25, David A. Black <dblack@rubypal.com>:
> Hi --
>
> On Tue, 25 Sep 2007, Gaspard Bucher wrote:
>
> > I need to eval code that will create globally available classes. I tried this :
> >
> > class Test
> >  def makeA
> >    Module.send(:eval, "class A; end")
> >    # same with: eval "class A; end"
> >    puts Test.const_get('A') # => Test::A
> >    puts Module.const_get('A') # => raise NameError, why ?
> >  end
> > end
> >
> > eval "class B; end"
> > puts Module.const_get('B') # => B
> >
> > Test.new.makeA #=> bang
>
> You could do:
>
>    Module.module_eval "class A; end"
>
> or (preferable, in my opinion):
>
>    Module.const_set("A", Class.new)
>
>
> David
>
> --
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>
>