From: Robert Klemme <shortcutter@...>
Date: 2008-12-30T03:16:37+09:00
Subject: Re: Include constants from one scope into another ( A::* )

2008/12/29 Alexey Petrushin <axyd80@gmail.com>:
> Hello! Is there a way to include constants from one class into another?
> Something like "include A::*"?
>
> SAMPLE:
>
>    class A
>        class B; end
>        class C; end
>        class D; end
>    end
>
>    class E
>        # include A::*
>        B; C; D;
>    end

robert@fussel ~
$ ruby <<EOF
>
>    class A
>        class B; end
>        class C; end
>        class D; end
>    end
>
>    class E
> B=::A::B
> C=::A::C
> D=::A::D
> end
> p E::C.new
> EOF
#<A::C:0x1002ebc0>

robert@fussel ~
$

You can as well do something like this

class Module
  def import_all(mod)
    mod.constants.each do |c|
      const_set(c, mod.const_get(c))
    end
  end
end

irb(main):016:0> class E
irb(main):017:1> import_all A
irb(main):018:1> end
=> ["C", "B", "D"]
irb(main):019:0> E::B.new
=> #<A::B:0x7ff60548>

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end